CN113884219B - Surface temperature measuring device and measuring method - Google Patents
Surface temperature measuring device and measuring method Download PDFInfo
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- CN113884219B CN113884219B CN202111477287.3A CN202111477287A CN113884219B CN 113884219 B CN113884219 B CN 113884219B CN 202111477287 A CN202111477287 A CN 202111477287A CN 113884219 B CN113884219 B CN 113884219B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/14—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations
- G01K1/143—Supports; Fastening devices; Arrangements for mounting thermometers in particular locations for measuring surface temperatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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Abstract
The invention is suitable for the technical field of wind tunnel tests, and provides a surface temperature measuring device and a surface temperature measuring method, wherein the surface temperature measuring device comprises a test model and a temperature measuring area: a plurality of temperature measuring areas are arranged on the surface of the test model and are arranged in parallel; each temperature measuring area comprises a target temperature measuring layer and an adjacent temperature measuring layer, and the target temperature measuring layer and the adjacent temperature measuring layer are arranged in parallel along the temperature measuring direction; the target temperature measuring layer is sequentially provided with a plurality of target temperature measuring points along the temperature measuring direction, the adjacent temperature measuring layers are sequentially provided with a plurality of adjacent temperature measuring points along the temperature measuring direction, and temperature sensors are arranged in the target temperature measuring points and the adjacent temperature measuring points; the target temperature measuring point and the adjacent temperature measuring points are arranged in an inserting manner along the temperature measuring direction; on different temperature measuring areas, the distance between the target temperature measuring point and/or the adjacent temperature measuring point and the leading edge line in the arrangement direction is the same. The surface temperature measuring device and the surface temperature measuring method provided by the invention improve the accuracy of temperature distribution measurement.
Description
Technical Field
The invention relates to the technical field of wind tunnel tests, in particular to a surface temperature measuring device and a surface temperature measuring method.
Background
Icing of aircraft components can damage the aerodynamic profile of the aircraft, leading to reduced aerodynamic performance, and is one of the more significant sources of risk in flight safety accidents. Regarding the icing of the aircraft, the icing amount is closely related to the icing part of the aircraft, and the small icing amount at the key position and the large icing amount at other positions bring the same harm degree, wherein the key positions comprise the wing leading edge, the engine air inlet leading edge and the like. Meanwhile, the ice control conditions of different parts of the aircraft have respective characteristics, and the specific ice control modes also have differences in the aspects of types, functions, test indexes and the like.
The aircraft component deicing verification test mainly aims at evaluating the component deicing and deicing characteristics and is completed mainly by means of an icing wind tunnel at present. The aircraft deicing prevention and control means comprise hot gas deicing prevention and control, electric heating deicing prevention and control, mechanical deicing prevention and control, thermal coupling deicing prevention and control and the like, wherein the hot gas deicing prevention and control is mainly realized by introducing hot gas generated by an engine of the aircraft into a deicing prevention and control area, and the electric heating deicing prevention and control is mainly realized by electrifying and heating the corresponding deicing prevention and control area of the component, so that the surface temperature of the component is kept or quickly reaches above zero. Therefore, the change of the surface temperature of the deicing component is a key index reflecting the hot air and electric heating deicing effects, and is also a main basis for improving the deicing process and optimizing the model design.
Based on the icing control verification test of the icing wind tunnel, an icing control component faces extreme test environments, such as: high wind speed, high humidity, water drop impact, variable density, sudden temperature change, high heat source temperature and the like, which present great challenges for temperature measurement, and furthermore, the type, range, position arrangement, embedding manner and the like of the sensor are also considered. Therefore, in the icing wind tunnel hot air and electric heating deicing prevention tests, how to accurately measure the surface temperature of the deicing prevention component is a key point of the tests.
At present, a commonly used temperature sensor is a thermocouple temperature sensor which is a linear extension sensor, and the temperature sensing end of the sensor is output through an extension line. The distance between the temperature measuring points greatly influences the wiring mode of the thermocouple temperature measuring sensor, wiring is difficult if the distance between the temperature measuring points is too close, and the measured temperature distribution accuracy is poor if the distance between the temperature measuring points is too far, so that the requirements of icing wind tunnel hot air and electric heating ice prevention and removal tests are difficult to meet.
In summary, the technical problems to be solved by the present invention are:
1. in the prior art, in icing wind tunnel hot air and electric heating ice prevention and removal tests, how to accurately measure the surface temperature of an ice prevention and removal component is to be measured;
2. in the prior art, in icing wind tunnel hot air and electric heating ice prevention and removal tests, the arrangement mode of a sensor is greatly influenced by the distance between temperature measuring points;
3. in the prior art, when the distance between temperature measuring points is too far, the requirements of icing wind tunnel hot air and electric heating deicing tests are difficult to meet.
Disclosure of Invention
The invention aims to provide a surface temperature measuring device and a surface temperature measuring method, which solve the technical problem that a test model surface sensor is difficult to arrange and meet the requirement of high temperature distribution measurement precision in an icing wind tunnel deicing prevention test.
The invention provides a surface temperature measuring device, which comprises a test model and a temperature measuring area: the test model comprises an airfoil part, a plurality of temperature measuring regions are arranged on the surface of the test model and are arranged in parallel, the extending direction of the temperature measuring regions is the temperature measuring direction, and the temperature measuring direction is intersected with the front edge line of the airfoil part;
each temperature measuring area comprises a target temperature measuring layer and an adjacent temperature measuring layer, and the target temperature measuring layer and the adjacent temperature measuring layer are arranged in parallel along the temperature measuring direction; the target temperature measuring layer is sequentially provided with a plurality of target temperature measuring points along the temperature measuring direction, the adjacent temperature measuring layers are sequentially provided with a plurality of adjacent temperature measuring points along the temperature measuring direction, and temperature sensors are arranged in the target temperature measuring points and the adjacent temperature measuring points;
the target temperature measuring point and the adjacent temperature measuring points are arranged in an inserting manner along the temperature measuring direction;
on different temperature measuring areas, the distance between the target temperature measuring point and/or the adjacent temperature measuring point in the arrangement direction and the leading edge line is the same, and the arrangement direction is the direction perpendicular to the extension direction of the leading edge line.
Further, the distances between the target temperature measuring layer and the adjacent temperature measuring layers in different temperature measuring areas are the same.
Further, the temperature measurement direction is the same as the incoming flow direction, the relative distance between the adjacent temperature measurement points on the same temperature measurement area is the arithmetic mean of the relative distances of the target temperature measurement points, or the relative distance between the target temperature measurement points on the same temperature measurement area is the arithmetic mean of the relative distances of the adjacent temperature measurement points, and the relative distance is the vertical distance between the target temperature measurement point and/or the adjacent temperature measurement points and the leading edge line in the arrangement direction.
Furthermore, the temperature measuring areas are symmetrically arranged on two sides of the front edge line.
Further, the temperature sensor is a linear temperature sensor.
Further, still include PC, data acquisition equipment and temperature acquisition equipment, the PC with data acquisition equipment connects, temperature acquisition equipment with data acquisition equipment connects, data acquisition equipment with temperature sensor connects.
The invention also provides a method for measuring the surface temperature of the test model, and the device for measuring the surface temperature comprises the following steps:
step S10: acquiring the temperature of each temperature measuring point;
step S20: acquiring temperature distribution of a target temperature measuring area, wherein the temperature distribution is the variation trend of temperature values of all temperature measuring points in the target temperature measuring area along the temperature measuring direction, and the temperature distribution of the target temperature measuring area comprises the temperature distribution of a target temperature measuring layer and the temperature distribution of an adjacent temperature measuring layer; taking the temperature values of the adjacent temperature measuring points as the temperature value between the temperature measuring points of the two adjacent target temperature measuring points along the temperature measuring direction in the target temperature measuring area;
step S30: and obtaining the temperature distribution of the surface of the test model according to the temperature distribution of the target temperature measuring area.
Further, in step S10, the validity of the temperature measurement point is determined, and if the validity of the temperature measurement point is valid, the temperature value of the temperature measurement point is used as the measurement temperature value of the temperature measurement point; and if the validity of the temperature measuring point is invalid, correcting the temperature of the temperature measuring point to obtain a corrected temperature, and taking the corrected temperature as the measured temperature value of the temperature measuring point.
In summary, the present invention can achieve at least the following technical effects:
1. according to the invention, the plurality of temperature measuring regions are arranged on the surface of the test model, and the target temperature measuring layer and the adjacent temperature measuring layer are arranged in each temperature measuring region, so that the arrangement of temperature sensors is facilitated while accurate measurement is realized, the problem of the distance between temperature measuring points is solved well, and a precondition is provided for improving the accuracy of temperature distribution;
2. according to the invention, the target temperature measuring point and the adjacent temperature measuring points are arranged in a plugging manner along the temperature measuring direction, so that the temperature values of all positions in the temperature measuring direction are obtained as much as possible, the temperature values measured along the measuring direction are more than the temperature values obtained by a single temperature measuring layer in the prior art, the temperature values of all positions in the temperature measuring direction are accurately measured, and the reference values of temperature distribution in the temperature measuring area are enriched, thereby providing the accuracy of temperature distribution, providing accurate component surface temperature values for icing wind tunnel hot gas and electric heating ice prevention and removal tests, and further improving the accuracy and test efficiency of the icing wind tunnel hot gas and electric heating ice prevention and removal tests;
3. according to the invention, the distances between the target temperature measuring point and/or the adjacent temperature measuring points and the front edge line in the arrangement direction are set to be the same on different temperature measuring areas, so that a precondition is provided for temperature correction of the failure temperature measuring point, and the correction of the temperature value of the failure temperature measuring point through the temperature values of the corresponding temperature measuring points in other temperature measuring areas except the temperature measuring area where the failure temperature measuring point is located is possible, so that the procedures of reducing the test efficiency due to repeated inspection, replacement and the like caused by a few failure temperature measuring points are avoided, the efficiency of the temperature measurement test in the icing wind tunnel is improved, and the accuracy of the test result is ensured;
4. according to the invention, the temperature measuring direction is intersected with the front edge line of the wing section, so that the temperature measuring area is positioned at the front edge of the aircraft, the front edge can be used as an icing protection area to obtain the temperature distribution of the key position of the front edge, and thus, a good guarantee is provided for effectively avoiding the danger of the aircraft caused by icing of parts.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention or in the description of the prior art will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a perspective view of a surface temperature measuring device according to the present invention;
FIG. 2 is a sectional view of a surface temperature measuring device according to the present invention;
FIG. 3 is a schematic plan view of a surface temperature measuring device according to the present invention;
FIG. 4 is a schematic view of a method of correcting the surface temperature of the test model in the present invention;
FIG. 5 is a schematic representation of the effectiveness of the test model surface temperature measurement points of the present invention.
The test model comprises 100, a test model 110, a front edge part 111, a temperature measuring point 112 and a front edge line.
Detailed Description
The following description provides many different embodiments, or examples, for implementing different features of the invention. The particular examples set forth below are illustrative only and are not intended to be limiting.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection: may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
Example 1:
as shown in fig. 1, 2, and 3, embodiment 1 of the present invention provides a surface temperature measuring device, including a test model 100 and a temperature measuring area: the test model 100 comprises an airfoil portion 110, a plurality of temperature measuring regions are arranged on the surface of the test model 100 and are arranged in parallel, the extending direction of the temperature measuring regions is the temperature measuring direction, and the temperature measuring direction is intersected with a front edge line 112 of the airfoil portion 110;
each temperature measuring area comprises a target temperature measuring layer and an adjacent temperature measuring layer, and the target temperature measuring layer and the adjacent temperature measuring layer are arranged in parallel along the temperature measuring direction; the target temperature measuring layer is sequentially provided with a plurality of target temperature measuring points along the temperature measuring direction, the adjacent temperature measuring layers are sequentially provided with a plurality of adjacent temperature measuring points along the temperature measuring direction, and temperature sensors are arranged in the target temperature measuring points and the adjacent temperature measuring points;
the target temperature measuring point and the adjacent temperature measuring points are arranged in an inserting manner along the temperature measuring direction;
in different temperature measuring areas, the distance between the target temperature measuring point and/or the adjacent temperature measuring point and the leading edge line 112 in the arrangement direction is the same, and the arrangement direction is a direction perpendicular to the extending direction of the leading edge line 112.
As shown in figure 1 of the drawings, in which,A 1 、A 2 andA 3 a first temperature measuring area, a second temperature measuring area and a third temperature measuring area which are respectively arranged on the surface of the test model 100, wherein the first temperature measuring areaA 1 Comprises a first target temperature measuring layerL 1 gAnd a first adjacent temperature measuring layerL 1a Second temperature measuring zoneA 2 Comprises a second target temperature measuring layerL 2 gAnd a second adjacent temperature measuring layerL 2a Third temperature measuring zoneA 3 Comprises a third target temperature measuring layerL 3 gAnd a third adjacent temperature measuring layerL 3a (ii) a First temperature measuring areaA 1 The second temperature measuring areaA 2 And a third temperature measuring regionA 3 Arranged in parallel with each other, a first temperature measuring areaA 1 Extension direction, second temperature measurement zoneA 2 And the third temperature measuring regionA 3 The extension directions are all temperature measurement directions
Direction of measurement of temperature
Is arranged to intersect the leading edge line 112 of the airfoil portion 110.
First target temperature measuring layerL 1 gThe first adjacent temperature measuring layerL 1a Second target temperature measuring layerL 2 gThe second adjacent temperature measuring layerL 2a Third target temperature measuring layerL 3 gA third adjacent temperature measuring layerL 3a Respectively along the temperature measuring direction
Is sequentially provided with a first temperature measuring pointx 1,i The second temperature measuring pointx 2,i Third temperature measuring pointx 3,i . Wherein,iis the serial number of the temperature measuring points in the same temperature measuring area,iis an integer andi=1、2、3、...、n，nthe total number of temperature measuring points in the temperature measuring area. Specifically, the total number of temperature measuring points in the temperature measuring regions is set according to the test requirements, and the total number of temperature measuring points in each temperature measuring region can be the same or different.
First temperature measuring areaA 1 The temperature measuring points with odd serial numbers of the middle temperature measuring points are positioned on the first target temperature measuring layerL 1 gThat is, the temperature measuring points with odd-numbered temperature measuring points are used as target temperature measuring points, and the temperature measuring points with even-numbered temperature measuring points are positioned on the first adjacent temperature measuring layerL 1 aNamely, the temperature measuring points with the even number of the temperature measuring points are taken as the adjacent temperature measuring points; second temperature measuring areaA 2 And the third temperature measuring areaA 3 In the middle, the target temperature measuring point and the adjacent temperature measuring point can be connected with the first temperature measuring areaA 1 The corresponding relations of the serial numbers of the middle temperature measuring points are consistent. Similarly, the temperature measuring points with the even-numbered temperature measuring points can be used as target temperature measuring points, and the temperature measuring points with the odd-numbered temperature measuring points can be used as adjacent temperature measuring points.
The target temperature measuring point and the adjacent temperature measuring points are along the temperature measuring direction
In the plug-in setting, i.e. the target temperature measuring point is in the direction perpendicular to the temperature measuring direction
The upper position is positioned between two adjacent temperature measuring points, or the adjacent temperature measuring points are perpendicular to the temperature measuring direction
The upper part is positioned between two adjacent target temperature measuring points, such as adjacent temperature measuring pointsx 1,2 In the direction perpendicular to the temperature measurement
The upper position is positioned at two adjacent temperature measuring pointsx 1,1 Andx 1,3 in the meantime.
As shown in fig. 2, on different temperature measuring areas, the target temperature measuring point and/or the adjacent temperature measuring points are arranged in the arrangement direction
The same distance from the upper and leading edge lines 112, the arrangement direction
Perpendicular to the direction of extension of the leading edge line 112.
The temperature sensor is used for testing the temperature value of a target temperature measuring point or the temperature value of an adjacent temperature measuring point.
By arranging a plurality of temperature measuring areas on the surface of the test model 100 and arranging a target temperature measuring layer and an adjacent temperature measuring layer in each temperature measuring area, the arrangement of temperature sensors is facilitated while accurate measurement is realized, the problem of the distance between temperature measuring points is solved well, and a precondition is provided for improving the accuracy of temperature distribution.
The target temperature measuring point and the adjacent temperature measuring points are arranged in an inserting manner along the temperature measuring direction, so that the temperature values of all positions in the temperature measuring direction are obtained as much as possible, the temperature values measured along the temperature measuring direction are more than the temperature values obtained by a single temperature measuring layer in the prior art, the temperature values of all positions in the temperature measuring direction are accurately measured, and the reference values of temperature distribution in the temperature measuring area are enriched, so that the accuracy of temperature distribution is provided, accurate component surface temperature values are provided for icing wind tunnel hot air and electric heating ice prevention and removal tests, and the accuracy and the test efficiency of the icing wind tunnel hot air and electric heating ice prevention and removal tests are improved.
The distance between a target temperature measuring point and/or an adjacent temperature measuring point and the front edge line 112 in the arrangement direction is the same on different temperature measuring areas, a precondition is provided for temperature correction of a failure temperature measuring point, and in an anti-icing test of a test model, the heat supply distribution of an anti-icing component is uniform generally, so that the temperature value correction of the failure temperature measuring point through the temperature values of the corresponding temperature measuring points in other temperature measuring areas except the temperature measuring area where the failure temperature measuring point is located becomes possible, thereby avoiding the procedures of reducing the test efficiency due to repeated inspection, replacement and the like caused by a few failure temperature measuring points, improving the efficiency of the temperature measurement test in the icing wind tunnel, and simultaneously ensuring the accuracy of the test result.
The temperature measuring direction is intersected with the front edge line 112 of the wing section 110, so that the temperature measuring area is positioned at the front edge of the aircraft, the front edge can be used as an icing protection area in a key position, the temperature distribution of the front edge is obtained, and the risk of the aircraft caused by icing is effectively avoided.
Further, the distances between the target temperature measuring layer and the adjacent temperature measuring layers in different temperature measuring areas are the same.
First temperature measuring areaA 1 Middle first target temperature measuring layerL 1 gAnd the first adjacent temperature measuring layerL 1a The distance between the first and second temperature measuring areas is the first adjacent distanceA 2 Middle second target temperature measuring layerL 2 gAnd a second adjacent temperature measuring layerL 2a The distance between the first and second adjacent temperature measuring areas is the second adjacent distanceA 3 Middle third target temperature measuring layerL 3 gAnd a third adjacent temperature measuring layerL 3a The distance between the first and second adjacent distances is the third adjacent distance, and the first adjacent distance, the second adjacent distance and the third adjacent distance are equal.
Further, the temperature measurement direction is the same as the incoming flow direction, the relative distance between the adjacent temperature measurement points on the same temperature measurement area is the arithmetic mean of the relative distances of the target temperature measurement points, or the relative distance between the target temperature measurement points on the same temperature measurement area is the arithmetic mean of the relative distances of the adjacent temperature measurement points, and the relative distance is the vertical distance between the target temperature measurement point and/or the adjacent temperature measurement points and the leading edge line in the arrangement direction.
The above-mentionedDirection of temperature measurement
And the direction of incoming flowV q The same, the relative distance between the adjacent temperature measuring points in the same temperature measuring area is the arithmetic mean of the relative distance between the target temperature measuring points, such as the first temperature measuring areaA 1 Middle adjacent temperature measuring pointx 1,i Relative distance of
Whereins 1,i-1 ands 1,i-1 the relative distance between two adjacent target temperature measuring points is calculated; or whenx 1,i When the temperature is the target temperature measuring point,s 1,i-1 ands 1,i-1 is the relative distance between two adjacent temperature measuring points. The relative distances i For the target temperature measuring point and/or the adjacent temperature measuring points in the arrangement direction
The vertical distance between the upper and leading edge lines 112.
Further, as shown in fig. 3, the temperature measuring regions are symmetrically arranged on two sides of the leading edge line.
Further, the temperature sensor is a linear temperature sensor.
Further, still include PC, data acquisition equipment and temperature acquisition equipment, the PC with data acquisition equipment connects, temperature acquisition equipment with data acquisition equipment connects, data acquisition equipment with temperature sensor connects. The temperature acquisition equipment can be a temperature acquisition board card.
Example 2:
as shown in fig. 4, embodiment 2 of the present invention provides a method for measuring a surface temperature of a test model, and the method for measuring a surface temperature using the apparatus for measuring a surface temperature includes the following steps:
step S10: acquiring the temperature of each temperature measuring point;
step S20: acquiring temperature distribution of a target temperature measuring area, wherein the temperature distribution is the variation trend of temperature values of all temperature measuring points in the target temperature measuring area along the temperature measuring direction, and the temperature distribution of the target temperature measuring area comprises the temperature distribution of a target temperature measuring layer and the temperature distribution of an adjacent temperature measuring layer; taking the temperature values of the adjacent temperature measuring points as the temperature value between the temperature measuring points of the two adjacent target temperature measuring points along the temperature measuring direction in the target temperature measuring area;
step S30: and obtaining the temperature distribution of the surface of the test model according to the temperature distribution of the target temperature measuring area.
And the temperature distribution of the target temperature measuring area is to perform data fitting on all temperature measuring points in the target temperature measuring area, draw a relative distance-temperature distribution curve, and obtain a regular relation of relative distance-temperature change by using the temperatures of all temperature measuring points in the target temperature measuring area.
Further, in step S10, the validity of the temperature measurement point is determined, and if the validity of the temperature measurement point is valid, the temperature value of the temperature measurement point is used as the measurement temperature value of the temperature measurement point; and if the validity of the temperature measuring point is invalid, correcting the temperature of the temperature measuring point to obtain a corrected temperature, and taking the corrected temperature as the measured temperature value of the temperature measuring point.
When the effectiveness of the temperature measuring point is invalid, the temperature measuring point is a failed temperature measuring point, and the correction method of the failed temperature measuring point comprises the following steps:
step S11: acquiring a temperature value of each temperature measuring point, wherein if a temperature factor of the temperature measuring point is not less than a preset parameter, the temperature measuring point is a failure temperature measuring point; if the temperature factor of the temperature measuring point is less than the preset parameter, the temperature measuring point is an effective temperature measuring point; the temperature factor is the stability of the temperature value of the temperature measuring point within a preset time period;
step S12: taking the temperature value of the reference temperature measuring point as the correction temperature of the failure temperature measuring point; the reference temperature measuring point is a temperature measuring point in an effective temperature measuring area, the relative distance between the reference temperature measuring point and the invalid temperature measuring point is the same as that between a straight line of the temperature measuring point in the temperature measuring direction and the corner point of the front edge line;
the effective temperature measuring regions are obtained through common effective temperature measuring points in the invalid temperature measuring regions and common effective temperature measuring points in other temperature measuring regions, the common effective temperature measuring points are the temperature measuring points which have the same relative distance and are the effective temperature measuring points in the invalid temperature measuring regions and the other temperature measuring regions, the other temperature measuring regions are the temperature measuring regions except the invalid temperature measuring regions, and the invalid temperature measuring regions are the temperature measuring regions where the invalid temperature measuring points are located.
As shown in FIG. 1, the temperature measuring points 111 are arranged in different temperature measuring areas
The distance between the upper and leading edge lines 112 is the same, i.e.
Whereins 1,i is the first temperature measuring pointx 1,i In the arrangement direction
The distance between the upper and leading edge lines 112,s 2,i is the first temperature measuring pointx 2,i In the arrangement direction
Upper and leading edge line 112, the direction of the arrangement
Perpendicular to the direction of extension of the leading edge line 112.
Numbering the temperature measurement areas asr(ii) a Numbering the temperature measuring points asi(ii) a Will be firstrThe first in the signal temperature measuring areaiNumber temperature measurement point is marked as
To be connected torThe first in the signal temperature measuring areaiNumber temperature measuring point
Temperature factor of
. If temperature factor
If not less than the preset parameter, judging the temperature measuring point
For the failure temperature measuring point, the failure temperature measuring point is recorded as
(ii) a If temperature factor
If the temperature is less than the preset parameter, judging the temperature measuring point
The effective temperature measuring point is recorded as
(ii) a Wherein,r、iare all integer andr≧2、i≧2，
in order to fail the temperature measuring point,
is an effective temperature measuring point, as shown in fig. 5.
The temperature measuring area where the failure temperature measuring point is located is the failure temperature measuring area, and the failure temperature measuring area is recorded as
(ii) a Recording other temperature measuring areas except the failure temperature measuring area as
. OthersTemperature measuring area
And failure temperature measurement area
The temperature measurement points which are all effective temperature measurement points are common effective temperature measurement points, and as shown in FIG. 5, when the failure temperature measurement points are failure temperature measurement pointsxb 1,i The failure temperature measurement area is the first temperature measurement areaA 1 The other temperature measuring area is the second temperature measuring areaA 2 The second temperature measuring areaA 2 To the first temperature measuring area
The temperature measuring points of which are all effective temperature measuring points are all dividedi、iA temperature measuring point other than +1iWhen =5, i.e. the second temperature measuring zoneA 2 The common effective temperature measuring point in (1) isxe 2,i Andxb 2,i+1 outside point of temperature measurement, and first temperature measurement zoneA 1 The common effective temperature measuring point in (1) isxb 2,i Andxe 2,i+1 and (4) measuring temperature points outside.
The effective temperature measuring area is obtained by the common effective temperature measuring point in the invalid temperature measuring area and the common effective temperature measuring points in other temperature measuring areas, and the effective temperature measuring area is recorded as
，RThe serial numbers of other temperature measuring areas are shown,Ris an integer andR≠rreference temperature measurement point is recorded asxr，Reference temperature measuring pointxrIs an effective temperature measuring region
Middle and failure temperature measuring pointxb 1,i The relative distances of the two temperature measurement points are the same, such as: when the temperature measuring point failsxb 1,i Is the first temperature measuring pointx 1,i Effective temperature measuring area
Is the second temperature measuring areaA 2 The reference temperature measuring point is the second temperature measuring pointx 2,i Then the second temperature measuring point is setx 2,i As a first temperature measuring pointx 1,i The corrected temperature of (1).
Will be provided withtTime point and time temperature measuring point
Is recorded as
The temperature factor is a predetermined time lengthnInternal temperature value
The degree of stability of (a), wherein,tat time point, 1 ≦t≦n，nIs the final time duration.
Whether the temperature measuring point is invalid or not is judged by judging the sizes of the temperature factor and the preset parameter, and the invalid temperature measuring point is obtained efficiently and timely, so that the temperature measuring point can be repaired, replaced, corrected and the like in the follow-up process, the problem of inaccurate temperature measurement caused by the invalid temperature measuring point is effectively avoided, and the efficiency of the anti-icing and deicing test is improved;
the temperature value of the reference temperature measuring point is used as the correction temperature of the failure temperature measuring point, and the reference temperature measuring point is the temperature measuring point with the same relative distance with the failure temperature measuring point in the effective temperature measuring area, so that the correction of the temperature value of the failure temperature measuring point is realized, the correction temperature is closer to an actual value, the efficiency of a temperature measurement test in the icing wind tunnel is improved, and the accuracy of a test result is ensured;
in the anti-icing and deicing test, the heat supply distribution of the anti-icing and deicing component is generally uniform, so that the first temperature measuring areaA 1 The second temperature measuring areaA 2 And a third temperature measuring regionA 3 The temperature values of the temperature measuring points with the same relative position can be mutually referred. By the sum of the common effective temperature measurement points in the failure temperature measurement areaAnd determining an effective temperature measuring area by common effective temperature measuring points in other temperature measuring areas, optimizing the other temperature measuring areas by the common effective temperature measuring points to obtain the temperature measuring area which is closer to the temperature variation trend of the invalid temperature measuring area or the temperature value of the invalid temperature measuring point as the effective temperature measuring area, and further taking the temperature of the temperature measuring point at the position corresponding to the invalid temperature measuring point in the effective temperature measuring area as the corrected temperature of the invalid temperature measuring point, so that the accuracy of the corrected temperature of the invalid temperature measuring point is further ensured, and the accurate measurement of the surface temperature of the anti-icing and anti-icing part is ensured.
In step S11, the temperature factor is a standard deviation or a variance of the temperature value of each temperature measurement point within a predetermined time period. Temperature factor
Is calculated by the formula
Wherein
the average temperature of the ith temperature measuring point in the ith temperature measuring area in a preset time length n is calculated
The calculation formula of (2) is as follows:
。
the effective temperature measuring area is the temperature measuring area with the largest number of effective temperature measuring points in other temperature measuring areas. When the temperature is measured in the first temperature measurement area, as shown in FIG. 5A 1 Failure temperature measuring point inxb 1,i When the correction is carried out, the second temperature measuring areaA 2 And a third temperature measuring regionA 3 All are other temperature measuring areas, and the effective temperature measuring area is the second temperature measuring areaA 2 And the third temperature measuring areaA 3 Middle effective temperature measuring pointxeThe largest number of temperature sensing zones, i.e. when the second temperature sensing zoneA 2 Middle effective temperature measuring pointxeIn an amount ofn-1, third temperature measurement zoneA 3 Middle effective temperature measuring pointxeIn an amount ofn2 hours, the second temperature measuring areaA 2 As an effective temperature measurement area.
The effective temperature measuring area is the temperature measuring area with the minimum average temperature difference factor, the average temperature difference factor is the average value of the effective temperature difference factors, and the effective temperature difference factor is the relative stability degree of all common effective temperature measuring points in the invalid temperature measuring area and other temperature measuring areas.
The average temperature difference factor is recorded as
Mean temperature difference factor
The minimum temperature measurement area is recorded as
. Average temperature difference factor
Minimum temperature measurement area
As an effective temperature measurement area
(ii) a Mean temperature difference factor
Is calculated by the formula
Wherein
is an effective temperature difference factor. Effective temperature difference factor
For failure temperature measurement area
And the other temperature measuring areas
Relative degree of stability of all the common effective temperature measurement points. Temperature measuring area with relative stability degree of failure within same time
All the temperature values of the common effective temperature measuring points and other temperature measuring areas
The higher the discrete degree of the temperature values of all the common effective temperature measuring points and the relative stability degree, the higher the other temperature measuring areas
Temperature value or temperature change trend of each temperature measuring point and failure temperature measuring area
The closer the temperature value or the temperature change trend of each temperature point is.
Serial numbers of other temperature measuring regionsRAnd serial number of temperature measuring arearCorrespondingly, namely when other temperature measuring areas are the second temperature measuring areaA 2 When the temperature of the water is higher than the set temperature,r=2，R=2。
the effective temperature difference factor is the standard deviation of the temperature value of the common effective temperature measuring point in other temperature measuring areas and the average temperature value of the common effective temperature measuring point in the invalid temperature measuring area. The effective temperature difference factor is recorded as
Effective temperature difference factor
WhereinIare serial numbers of common effective temperature measuring points,Iis an integer andI≠i，
at the time point of the common effective temperature measuring point in other temperature measuring areastThe temperature value of (a) is determined,
the average temperature of the common effective temperature measuring point in the failure temperature measuring area within a preset time length is obtained.
Average temperature of common effective temperature measuring point in failure temperature measuring area
The calculation formula of (2) is as follows:
wherein
for the common effective temperature measuring point in the failure temperature measuring area at the time pointtThe temperature value of (2).
Number of common effective temperature measuring pointsIAnd serial number of temperature measuring pointiCorresponding, i.e. when the temperature measuring pointx 1,3 ，x 2,3 Respectively a failure temperature measuring layer (first temperature measuring layer)A 1 ) Middle and other temperature measuring layers (second temperature measuring zone)A 2 ) At the common temperature measuring point of the two-way temperature measuring device,i=3，Iand = 3. At this time, the average temperature
For failed temperature measuring pointx 1,3 While, when the predetermined period of time is 30s,n=30s，t=1s, 2s, 3s,. ·, 30s, i.e.
。
When other temperature measuring layers are the second temperature measuring areaA 2 When is at timeR=2, failure temperature measurement pointx 1,3 An effective temperature difference factor of
Failure temperature measuring pointx 1,3 Average temperature difference factor of
Is calculated by the formula
Thereby obtaining other temperature measuring layers as a second temperature measuring areaA 2 Time-failure temperature measuring pointx 1,3 Average temperature difference factor of
。
Calculated in the same way, when other temperature measuring layers are the third temperature measuring areaA 3 Time-failure temperature measuring pointx 1,3 Average temperature difference factor of
Comparison of
And
. If it is
And then the third temperature measuring areaA 3 Is a mean temperature difference factor
Minimum temperature measurement area
Third temperature measuring zoneA 3 Is an effective temperature measuring region
(ii) a If it is
The second temperature measurement areaA 2 Is a mean temperature difference factor
Minimum temperature measurement area
Second temperature measuring zoneA 2 Is an effective temperature measuring region
(ii) a If it is
And then the third temperature measuring areaA 3 Or the second temperature measuring areaA 2 Is a mean temperature difference factor
Minimum temperature measurement area
Effective temperature measuring area
Is the third temperature measuring areaA 3 Or the second temperature measuring areaA 2 Is any one of the layers.
When the reference temperature measuring point is an effective temperature measuring point, taking the temperature value of the reference temperature measuring point as the temperature value of the failure temperature measuring point; and when the reference temperature measuring point is the failure temperature measuring point, performing data fitting on all effective temperature measuring points in the effective temperature measuring area to obtain a temperature value of the reference temperature measuring point, and taking the temperature value of the reference temperature measuring point as the temperature value of the failure temperature measuring point.
When the temperature measuring point fails, as shown in FIG. 5xb 1,i Serial number ofiWhen =5, effective temperature measuring area
Is the second temperature measuring areaA 2 The second temperature measuring areaA 2 Middle 5 th temperature measuring pointx 2,5 As a reference temperature measuring pointxr. When referring to the temperature measuring pointxrIs an effective temperature measuring pointxe 2,5 Then the effective temperature measuring point is measuredxe 2,5 Temperature value of
As failure temperature measuring pointxb 1,i Corrected temperature of
。
Effective temperature measuring area
Is the third temperature measuring areaA 3 The third temperature measuring areaA 3 Middle 5 th temperature measuring pointx 3,5 As a reference temperature measuring pointxr. Reference temperature measuring pointxrFor failed temperature measuring pointxb 3,5 Then to the third temperature measuring areaA 3 All the effective temperature measuring points (except forxb 3,5 Andxb 3,n-2 out-of-time temperature measurement points) to perform data fitting, draw a temperature distribution curve, and use a third temperature measurement areaA 3 Obtaining the temperature of all effective temperature measuring points to obtain the regular relation of relative distance-temperature change, thereby obtaining the failure temperature measuring pointsxb 3,5 Corrected temperature of
Will fail temperature measuring pointxb 3,5 Temperature value of
As failure temperature measuring pointxb 1,i Corrected temperature of
。
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The surface temperature measuring device is characterized by comprising a test model and a temperature measuring area:
the test model comprises an airfoil part, a plurality of temperature measuring regions are arranged on the surface of the test model and are arranged in parallel, the extending direction of the temperature measuring regions is the temperature measuring direction, and the temperature measuring direction is intersected with the front edge line of the airfoil part;
each temperature measuring area comprises a target temperature measuring layer and an adjacent temperature measuring layer, and the target temperature measuring layer and the adjacent temperature measuring layer are arranged in parallel along the temperature measuring direction; the target temperature measuring layer is sequentially provided with a plurality of target temperature measuring points along the temperature measuring direction, the adjacent temperature measuring layers are sequentially provided with a plurality of adjacent temperature measuring points along the temperature measuring direction, and temperature sensors are arranged in the target temperature measuring points and the adjacent temperature measuring points;
the target temperature measuring point and the adjacent temperature measuring points are arranged in an inserting manner along the temperature measuring direction;
on different temperature measuring areas, the distance between the target temperature measuring point and/or the adjacent temperature measuring point in the arrangement direction and the leading edge line is the same, and the arrangement direction is the direction perpendicular to the extension direction of the leading edge line.
2. The device for measuring surface temperature of claim 1, wherein the distance between the target temperature zone and the adjacent temperature zones is the same in different temperature zones.
3. A surface temperature measuring device according to claim 2, wherein the temperature measuring direction is the same as the incoming flow direction, and the relative distance between the adjacent temperature measuring points on the same temperature measuring area is an arithmetic mean of the relative distances between the target temperature measuring points, or the relative distance between the target temperature measuring points and/or the adjacent temperature measuring points on the same temperature measuring area is an arithmetic mean of the relative distances between the adjacent temperature measuring points, and the relative distance is a perpendicular distance between the target temperature measuring point and/or the adjacent temperature measuring points and the leading edge line in the arrangement direction.
4. A surface temperature measuring device as claimed in claim 2, wherein the temperature measuring regions are symmetrically disposed on either side of the leading edge line.
5. A surface temperature measuring device as claimed in any one of claims 1 to 4, wherein said temperature sensor is a linear temperature sensor.
6. A surface temperature measuring device as claimed in any one of claims 1 to 4, further comprising a PC, a data acquisition device and a temperature acquisition device, wherein said PC is connected to said data acquisition device, said temperature acquisition device is connected to said data acquisition device, and said data acquisition device is connected to said temperature sensor.
7. A method for measuring the surface temperature of a test pattern, using a surface temperature measuring apparatus according to any one of claims 1 to 6, comprising the steps of:
step S10: acquiring the temperature of each temperature measuring point;
step S20: acquiring temperature distribution of a target temperature measuring area, wherein the temperature distribution is the variation trend of temperature values of all temperature measuring points in the target temperature measuring area along the temperature measuring direction, and the temperature distribution of the target temperature measuring area comprises the temperature distribution of a target temperature measuring layer and the temperature distribution of an adjacent temperature measuring layer; taking the temperature values of the adjacent temperature measuring points as the temperature value between the two adjacent target temperature measuring points along the temperature measuring direction in the target temperature measuring area;
step S30: and obtaining the temperature distribution of the surface of the test model according to the temperature distribution of the target temperature measuring area.
8. The method according to claim 7, wherein in step S10, the validity of the temperature measurement point is determined, and if the validity of the temperature measurement point is valid, the temperature measurement point is an effective temperature measurement point, and the temperature value of the effective temperature measurement point is used as the measurement temperature value of the temperature measurement point; if the effectiveness of the temperature measuring point is invalid, the temperature measuring point is an invalid temperature measuring point, the temperature of the invalid temperature measuring point is corrected to obtain a corrected temperature, and the corrected temperature is used as a measured temperature value of the invalid temperature measuring point;
the correction method of the failure temperature measuring point comprises the following steps:
step S11: acquiring a temperature value of each temperature measuring point, wherein if a temperature factor of the temperature measuring point is not less than a preset parameter, the temperature measuring point is a failure temperature measuring point; if the temperature factor of the temperature measuring point is less than the preset parameter, the temperature measuring point is an effective temperature measuring point; the temperature factor is the stability of the temperature value of the temperature measuring point within a preset time period;
step S12: taking the temperature value of the reference temperature measuring point as the correction temperature of the failure temperature measuring point; the reference temperature measuring point is a temperature measuring point in an effective temperature measuring area, the relative distance between the reference temperature measuring point and the invalid temperature measuring point is the same as that between a straight line of the temperature measuring point in the temperature measuring direction and the corner point of the front edge line;
the effective temperature measuring regions are obtained through common effective temperature measuring points in the invalid temperature measuring regions and common effective temperature measuring points in other temperature measuring regions, the common effective temperature measuring points are the temperature measuring points which have the same relative distance and are the effective temperature measuring points in the invalid temperature measuring regions and the other temperature measuring regions, the other temperature measuring regions are the temperature measuring regions except the invalid temperature measuring regions, and the invalid temperature measuring regions are the temperature measuring regions where the invalid temperature measuring points are located.
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| GB8629016D0 (en) * | 1986-12-04 | 1987-01-14 | Univ Aberdeen | Multi point temperature sensor |
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| EP0969264A3 (en) * | 1998-05-06 | 2001-06-13 | Dr. Johannes Heidenhain GmbH | Flat sensor and its application in a procedure to compensate for thermal deformations |
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