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CN112284753B - Method and device for measuring and analyzing flow of gas compressor test and gas compressor test system - Google Patents

Method and device for measuring and analyzing flow of gas compressor test and gas compressor test system Download PDF

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Publication number
CN112284753B
CN112284753B CN202011574268.8A CN202011574268A CN112284753B CN 112284753 B CN112284753 B CN 112284753B CN 202011574268 A CN202011574268 A CN 202011574268A CN 112284753 B CN112284753 B CN 112284753B
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flow
fluctuation
compressor
time
relative
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CN112284753A (en
Inventor
姜逸轩
曹传军
吴帆
翟志龙
王进春
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AECC Commercial Aircraft Engine Co Ltd
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AECC Commercial Aircraft Engine Co Ltd
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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
    • G01M15/00—Testing of engines
    • G01M15/14—Testing gas-turbine engines or jet-propulsion engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
    • F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00—Subject matter not provided for in other groups of this subclass
    • G01M99/005—Testing of complete machines, e.g. washing-machines or mobile phones

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Measuring Volume Flow (AREA)

Abstract

The disclosure relates to a method and a device for measuring and analyzing flow in a compressor test and a compressor test system, wherein the analysis method comprises the following steps: collecting actual flow measurement value of compressor test at preset frequency f
Figure DEST_PATH_IMAGE001
(ii) a For each moment of time
Figure 557503DEST_PATH_IMAGE002
Corresponding measured value of flow
Figure 521916DEST_PATH_IMAGE001
Calculate the time of day
Figure 628675DEST_PATH_IMAGE002
To stabilize the flow
Figure DEST_PATH_IMAGE003
(ii) a Calculating each time instant
Figure 2674DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
Figure 922089DEST_PATH_IMAGE004
(ii) a Calculating each time instant
Figure 350796DEST_PATH_IMAGE002
Relative fluctuation amount of downward flow
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(ii) a According to the absolute fluctuation amount of the flow
Figure 80986DEST_PATH_IMAGE004
And stationRelative fluctuation amount of the flow
Figure 483892DEST_PATH_IMAGE005
Analyzing the measured value of the flow rate
Figure 206997DEST_PATH_IMAGE001
Is detected.

Description

Method and device for measuring and analyzing flow of gas compressor test and gas compressor test system
Technical Field
The disclosure relates to the technical field of compressor tests, in particular to a method and a device for measuring and analyzing flow of a compressor test and a compressor test system.
Background
In the process of developing an aircraft engine compressor, the compressor test is required to be carried out, and various parameters such as the flow, the pressure ratio, the efficiency and the like of the compressor are measured. Among them, the measurement of the compressor flow is an extremely important task. The method has the advantages that the flow of the air compressor is accurately tested and measured, and the method has great significance for evaluating the total characteristics of the air compressor, so that the requirement on the measurement precision of the flow of the air compressor in the test process is high. In the actual test process, the phenomenon of insufficient flow measurement precision of the compressor always occurs due to various reasons. One common phenomenon is that the actually measured flow of the compressor fluctuates greatly. When the flow fluctuation is large, the actual flow of the gas compressor cannot be accurately obtained through test.
Disclosure of Invention
The embodiment of the disclosure provides a method and a device for measuring and analyzing the flow of a compressor test and a compressor test system, which can more accurately evaluate the flow fluctuation condition in the compressor test process.
According to a first aspect of the present disclosure, there is provided a compressor test flow measurement analysis method, including:
collecting flow measured value in compressor test process by preset frequency f
Figure 246177DEST_PATH_IMAGE001
；
For each moment of time
Figure 6323DEST_PATH_IMAGE002
Corresponding measured value of flow
Figure 958842DEST_PATH_IMAGE001
Calculate the time of day
Figure 95425DEST_PATH_IMAGE002
To stabilize the flow
Figure 888938DEST_PATH_IMAGE003
；
Calculating each time instant
Figure 570717DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
Figure 262729DEST_PATH_IMAGE004
；
Calculating each time instant
Figure 186692DEST_PATH_IMAGE002
Relative fluctuation amount of downward flow
Figure 350824DEST_PATH_IMAGE005
；
According to the absolute fluctuation amount of flow
Figure 718352DEST_PATH_IMAGE004
Amount of relative fluctuation of sum flow
Figure 84611DEST_PATH_IMAGE005
The calculated result of (2) analyzing the measured value of the flow rate
Figure 48150DEST_PATH_IMAGE001
Is detected.
In some embodiments, for each time instant
Figure 629304DEST_PATH_IMAGE002
Corresponding measured value of flow
Figure 151421DEST_PATH_IMAGE001
Calculate the time of day
Figure 503512DEST_PATH_IMAGE002
To stabilize the flow
Figure 520009DEST_PATH_IMAGE003
Comprises the following steps:
from time of day
Figure 204937DEST_PATH_IMAGE002
Firstly, selecting the measured flow values corresponding to the N time values forwards and backwards
Figure 914267DEST_PATH_IMAGE001
；
Calculating the measured flow value in 2N time values
Figure 491005DEST_PATH_IMAGE001
As the average value of time
Figure 560461DEST_PATH_IMAGE002
To stabilize the flow
Figure 541973DEST_PATH_IMAGE003
。
In some embodiments, each time instant is calculated
Figure 422204DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
Figure 47089DEST_PATH_IMAGE004
Comprises the following steps:
each time point
Figure 93805DEST_PATH_IMAGE002
Measured value of flow
Figure 504058DEST_PATH_IMAGE001
Subtracting the fitted steady flow
Figure 804458DEST_PATH_IMAGE003
As time of day
Figure 352858DEST_PATH_IMAGE002
Amount of absolute fluctuation of flow rate of
Figure 514849DEST_PATH_IMAGE004
。
In some embodiments, each time instant is calculated
Figure 763296DEST_PATH_IMAGE002
Relative fluctuation amount of downward flow
Figure 985330DEST_PATH_IMAGE005
Comprises the following steps:
each time point
Figure 23956DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
Figure 238905DEST_PATH_IMAGE004
Divided by the time of day
Figure 975480DEST_PATH_IMAGE002
To stabilize the flow
Figure 289787DEST_PATH_IMAGE003
To obtain the time of day
Figure 878026DEST_PATH_IMAGE002
Relative fluctuation amount of flow rate of
Figure 381819DEST_PATH_IMAGE005
。
In some embodiments, the measured flow value is analyzed
Figure 808121DEST_PATH_IMAGE001
The step of fluctuating situation of (a) comprises:
plotting absolute fluctuation amount of flow
Figure 854181DEST_PATH_IMAGE004
According to time
Figure 365934DEST_PATH_IMAGE002
To analyze the amount of absolute fluctuation of the flow rate
Figure 673419DEST_PATH_IMAGE004
(ii) a change in (c);
drawing relative conversion rotating speed at any moment under the same time axis
Figure 190113DEST_PATH_IMAGE002
The variation curve of (d);
analyzing the absolute fluctuation of flow
Figure 174118DEST_PATH_IMAGE004
The change condition of the rotating speed is changed along with different relative conversion rotating speeds.
In some embodiments, the measured flow value is analyzed
Figure 411983DEST_PATH_IMAGE001
The step of fluctuating situation of (a) comprises:
plotting relative fluctuation amount of flow
Figure 523158DEST_PATH_IMAGE005
According to time
Figure 720790DEST_PATH_IMAGE002
Variations of (2)Curve to analyze the relative fluctuation of the flow
Figure 314845DEST_PATH_IMAGE005
(ii) a change in (c);
drawing relative conversion rotating speed at any moment under the same time axis
Figure 348660DEST_PATH_IMAGE002
The variation curve of (d);
analyzing the relative fluctuation of flow
Figure 247215DEST_PATH_IMAGE005
The change condition of the rotating speed is changed along with different relative conversion rotating speeds.
In some embodiments, the measured flow value is analyzed
Figure 735571DEST_PATH_IMAGE001
The step of fluctuating situation of (a) comprises:
plotting absolute fluctuation amount of flow
Figure 812112DEST_PATH_IMAGE004
Measured value according to flow
Figure 582491DEST_PATH_IMAGE001
The variation curve of (d);
analyzing the absolute fluctuation of flow
Figure 769889DEST_PATH_IMAGE004
Measured value according to flow
Figure 381262DEST_PATH_IMAGE001
To assist in analyzing the measurement accuracy of a flow sensing component used to measure compressor flow.
In some embodiments, the measured flow value is analyzed
Figure 815654DEST_PATH_IMAGE001
The step of fluctuating situation of (a) comprises:
plotting relative fluctuation amount of flow
Figure 527125DEST_PATH_IMAGE005
Measured value according to flow
Figure 705166DEST_PATH_IMAGE001
The variation curve of (d);
analyzing the relative fluctuation of flow
Figure 233361DEST_PATH_IMAGE005
Measured value according to flow
Figure 651704DEST_PATH_IMAGE001
To assist in analyzing the measurement accuracy of a flow sensing component used to measure compressor flow.
In some embodiments, in the case that it is analyzed that the measurement accuracy of the flow detection part is lower than the preset accuracy, the compressor test flow measurement analysis method further includes:
the method for improving the flow measurement accuracy comprises at least one of the following methods: replacing the flow detection part; adjusting the throttle ratio of the compressor to enable the relative conversion rotating speed to avoid the interval with large flow fluctuation; and comparing the absolute fluctuation amount of the flow rate before and after the replacement of the flow rate detection unit
Figure 131096DEST_PATH_IMAGE004
Measured value according to flow
Figure 611362DEST_PATH_IMAGE001
The change curve of (2).
In some embodiments, the compressor test flow measurement analysis method further comprises:
performing at least two tests on the flow measurement of the compressor;
the flow fluctuations in at least two experiments were compared.
According to a second aspect of the present disclosure, there is provided a compressor test flow measurement analysis device, including: the method for analyzing the test flow measurement of the compressor is used for implementing the embodiment.
According to a third aspect of the present disclosure, there is provided a compressor test flow measurement system comprising:
the compressor test flow measurement analysis device of the embodiment; and
a flow detection component configured to measure compressor flow.
According to a fourth aspect of the present disclosure, there is provided a compressor testing system, comprising: the compressor test flow measurement analysis device or the compressor test flow measurement system of the embodiment.
According to the method for analyzing the flow measurement of the air compressor test, when the flow is measured in the air compressor test process, the flow can be stabilized through calculation and fitting
Figure 243332DEST_PATH_IMAGE003
The method provides a reference for the fluctuation amplitude analysis of the flow, and calculates the absolute fluctuation amount of the flow
Figure 19527DEST_PATH_IMAGE004
Amount of relative fluctuation of sum flow
Figure 487680DEST_PATH_IMAGE005
Therefore, the fluctuation condition of flow measurement can be accurately evaluated, and a reference is provided for the accuracy of the flow measurement of the compressor.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings.
FIG. 1 is the measured value of the flow rate in experiment A in the first example
Figure 86151DEST_PATH_IMAGE001
Over time
Figure 450923DEST_PATH_IMAGE002
Change map (example of case where fluctuation is large).
FIG. 2 is a block diagramExperimental example B measured flow value
Figure 211069DEST_PATH_IMAGE001
Over time
Figure 665053DEST_PATH_IMAGE002
Change map (case example in which fluctuation is small).
FIG. 3 shows the absolute fluctuation of the flow rate in the experiment A in the first example
Figure 490052DEST_PATH_IMAGE004
Over time
Figure 96614DEST_PATH_IMAGE002
Change map (example of case where fluctuation is large).
FIG. 4 shows the absolute fluctuation amount of the flow rate in test B in example two
Figure 276928DEST_PATH_IMAGE004
Over time
Figure 920006DEST_PATH_IMAGE002
Change map (case example in which fluctuation is small).
FIG. 5 is the flow rate relative fluctuation amount of experiment A in the first example
Figure 329121DEST_PATH_IMAGE005
Over time
Figure 39457DEST_PATH_IMAGE002
Change map (example of case where fluctuation is large).
FIG. 6 is the flow rate relative fluctuation amount in experiment B in example two
Figure 899660DEST_PATH_IMAGE005
Over time
Figure 564122DEST_PATH_IMAGE002
Change map (case example in which fluctuation is small).
FIG. 7 shows the absolute fluctuation of the flow rate in the experiment A in the first example
Figure 42508DEST_PATH_IMAGE004
Along with the measured flow
Figure 872930DEST_PATH_IMAGE001
Change map (example of case where fluctuation is large).
FIG. 8 shows the absolute fluctuation amount of the flow rate in test B in example two
Figure 145779DEST_PATH_IMAGE004
Along with the measured flow
Figure 497870DEST_PATH_IMAGE001
Change map (case example in which fluctuation is small).
FIG. 9 is the flow rate relative fluctuation amount of experiment A in the first example
Figure 763635DEST_PATH_IMAGE005
Along with the measured flow
Figure 199295DEST_PATH_IMAGE001
Change map (example of case where fluctuation is large).
FIG. 10 is the flow rate relative fluctuation amount in experiment B in the second example
Figure 331462DEST_PATH_IMAGE005
Along with the measured flow
Figure 734630DEST_PATH_IMAGE001
Change map (case example in which fluctuation is small).
Fig. 11 is a schematic flow diagram of some embodiments of a compressor test flow measurement analysis method of the present disclosure.
Detailed Description
The present disclosure is described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Aspects so defined may be combined with any other aspect or aspects unless clearly indicated to the contrary. In particular, any feature considered to be preferred or advantageous may be combined with one or more other features considered to be preferred or advantageous.
The terms "first", "second", and the like in the present disclosure are merely for convenience of description to distinguish different constituent elements having the same name, and do not denote a sequential or primary-secondary relationship.
In the description of the present invention, it is to be understood that the terms "inner", "outer", "upper", "lower", "left" and "right", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention, and do not indicate or imply that the device referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the scope of the present invention.
First, the present disclosure provides a method for analyzing a compressor test flow measurement, and some terms appearing later are explained herein.
The axial flow compressor is a multi-stage compression device with the airflow flowing direction consistent or nearly consistent with the rotating axial lead direction of a working wheel, is formed by alternately arranging a series of stators and rotors, and is commonly used for an aircraft engine or a gas turbine. The flow rate is the mass of gas flowing through the main flow channel of the axial flow compressor in unit time, and the unit is generally kg/s. The converted flow rate is based on a similar principle, and the physical flow rate of the compressor is converted into the physical flow rate under the inlet conditions (inlet total temperature 288.15K and inlet total pressure 101325 Pa) of the pneumatic standard condition, and the unit is generally kg/s. The flow detection part is a tubular measuring device which is placed at the inlet of a test piece and used for measuring the flow of test air when the air compressor or the aero-engine is tested. The test performed during the test of the gas compressor is a process of acquiring parameters such as flow, pressure ratio, efficiency and the like of the gas compressor through test equipment.
In some embodiments, as shown in fig. 11, the compressor test flow measurement analysis method includes the following steps:
step 110, collecting a flow measured value in the process of testing the compressor at a preset frequency f
Figure 554819DEST_PATH_IMAGE001
(ii) a E.g. preset frequencyWhen the rate f is 10Hz, 10 data are collected every second, namely 10 time values are generated
Figure 536331DEST_PATH_IMAGE002
And 10 measured values of the flow
Figure 665830DEST_PATH_IMAGE001
The measured value is the measured fluctuation flow;
step 120, for each time
Figure 729863DEST_PATH_IMAGE002
Corresponding measured value of flow
Figure 88163DEST_PATH_IMAGE001
Calculate the time of day
Figure 685367DEST_PATH_IMAGE002
To stabilize the flow
Figure 218723DEST_PATH_IMAGE003
；
Step 130, calculating each time
Figure 81636DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
Figure 492895DEST_PATH_IMAGE004
；
Step 140, calculating each time
Figure 446070DEST_PATH_IMAGE002
Relative fluctuation amount of downward flow
Figure 668104DEST_PATH_IMAGE005
；
150, according to the absolute fluctuation amount of the flow
Figure 267581DEST_PATH_IMAGE004
Amount of relative fluctuation of sum flow
Figure 670748DEST_PATH_IMAGE005
The calculated result of (2) analyzing the measured value of the flow rate
Figure 790014DEST_PATH_IMAGE001
Is detected.
When the embodiment measures the flow in the process of testing the gas compressor, the flow can be stabilized by fitting through calculation
Figure 432217DEST_PATH_IMAGE003
The method provides a reference for the fluctuation amplitude analysis of the flow, and calculates the absolute fluctuation amount of the flow on the reference by using a dimensionless analysis idea
Figure 269723DEST_PATH_IMAGE004
Amount of relative fluctuation of sum flow
Figure 524249DEST_PATH_IMAGE005
Therefore, the fluctuation condition of flow measurement can be accurately evaluated, and the condition that the original actual flow measurement value has larger fluctuation and has larger influence on the accuracy of the measurement result can be identified. Therefore, the embodiment can measure the flow rate according to the flow rate measured value collected in the compressor test process
Figure 684972DEST_PATH_IMAGE001
And the actually measured flow fluctuation of the gas compressor is accurately evaluated, so that the fluctuation condition of the flow in the test process of the gas compressor is well evaluated, and a reference is provided for the flow measurement accuracy of the gas compressor.
In some embodiments, step 120 is for each time instant
Figure 934294DEST_PATH_IMAGE002
Corresponding measured value of flow
Figure 259096DEST_PATH_IMAGE001
Calculate the time of day
Figure 550269DEST_PATH_IMAGE002
To stabilize the flow
Figure 644127DEST_PATH_IMAGE003
The method comprises the following steps:
step 120A, Slave time
Figure 67280DEST_PATH_IMAGE002
Firstly, selecting the measured flow values corresponding to the N time values forwards and backwards
Figure 863067DEST_PATH_IMAGE001
；
Step 120B, calculating the measured flow value in 2N time values
Figure 974242DEST_PATH_IMAGE001
As the average value of time
Figure 613952DEST_PATH_IMAGE002
To stabilize the flow
Figure 768859DEST_PATH_IMAGE003
。
For example, in the analysis, the time is calculated for the data with the data collection frequency f
Figure 802674DEST_PATH_IMAGE002
To stabilize the flow
Figure 874797DEST_PATH_IMAGE003
Selecting a time
Figure 192515DEST_PATH_IMAGE002
Calculating the average value of the 2N measured flow values as the fitting stable flow at the time by using the flow measured values corresponding to the previous N time values and the next N time values at the time, wherein the flow measured values can be calculated by the following formula:
Figure 269055DEST_PATH_IMAGE006
wherein the value range of N is more than or equal to 10 and less than or equal to 500.
The embodiment can fit the measured value of the flow in a period of flow acquisition
Figure 475652DEST_PATH_IMAGE001
The average value of the flow rate is used for reflecting the change trend of the flow rate along with the time, and a basis are provided for the subsequent calculation of the flow rate fluctuation amount.
For example, as shown in FIG. 1, the measured flow rate in test A
Figure 912319DEST_PATH_IMAGE001
Over time
Figure 835275DEST_PATH_IMAGE002
The change curve is B1, and the flow is stabilized by fitting
Figure 771133DEST_PATH_IMAGE003
Over time
Figure 28807DEST_PATH_IMAGE002
The curve is C1, the flow fluctuates more when viewed from the enlarged view in the lower right corner. Further, the relative scaled rotation speeds over time are given in fig. 1 in the same coordinate system
Figure 699524DEST_PATH_IMAGE002
Curve a1, from which the measured flow can be seen
Figure 476987DEST_PATH_IMAGE001
As a function of the relative scaled rotation speed.
FIG. 2 shows the measured values of the flow rates in test B
Figure 144597DEST_PATH_IMAGE001
Over time
Figure 63137DEST_PATH_IMAGE002
The change curve is B2, and the flow is stabilized by fitting
Figure 982552DEST_PATH_IMAGE003
Over time
Figure 362324DEST_PATH_IMAGE002
The curve is C2, the flow fluctuation is small as seen from the enlarged view in the lower right corner. Further, the relative scaled rotation speeds over time are given in fig. 2 in the same coordinate system
Figure 951568DEST_PATH_IMAGE002
Curve a2, from which the measured flow can be seen
Figure 183835DEST_PATH_IMAGE001
As a function of the relative scaled rotation speed.
In some embodiments, step 130 calculates each time instant
Figure 205143DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
Figure 691619DEST_PATH_IMAGE004
The method comprises the following steps:
each time point
Figure 966612DEST_PATH_IMAGE002
Measured value of flow
Figure 862673DEST_PATH_IMAGE001
Subtracting the fitted steady flow
Figure 733677DEST_PATH_IMAGE003
As time of day
Figure 589507DEST_PATH_IMAGE002
Amount of absolute fluctuation of flow rate of
Figure 599182DEST_PATH_IMAGE004
I.e. by
Figure 25616DEST_PATH_IMAGE007
。
The embodiment calculates each time
Figure 651376DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
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Can reflect the measured value of the flow
Figure 463660DEST_PATH_IMAGE001
Flow stabilization with respect to fitting
Figure 518334DEST_PATH_IMAGE003
If the respective time instants
Figure 996720DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
Figure 77676DEST_PATH_IMAGE004
If the whole is large, the test accuracy of the flow rate detection means is low, and it is difficult to satisfy the test requirements, and if the flow rate is actually measured at individual time
Figure 803055DEST_PATH_IMAGE001
When the abnormal condition occurs, the collected data in the current time period can be abandoned, and the flow data in other time periods can be collected as effective test data.
In some embodiments, step 140 calculates each time instant
Figure 204081DEST_PATH_IMAGE002
Relative fluctuation amount of downward flow
Figure 236890DEST_PATH_IMAGE005
The method comprises the following steps:
each time point
Figure 859501DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
Figure 303252DEST_PATH_IMAGE004
Divided by the time of day
Figure 204956DEST_PATH_IMAGE002
To stabilize the flow
Figure 212095DEST_PATH_IMAGE003
To obtain the time of day
Figure 190677DEST_PATH_IMAGE002
Relative fluctuation amount of flow rate of
Figure 805329DEST_PATH_IMAGE005
(ii) a Wherein,
Figure 367898DEST_PATH_IMAGE005
calculated by the following formula:
Figure 745439DEST_PATH_IMAGE008
the embodiment calculates each time
Figure 77064DEST_PATH_IMAGE002
Relative fluctuation amount of downward flow
Figure 816612DEST_PATH_IMAGE005
Can know each moment
Figure 679525DEST_PATH_IMAGE002
And the flow fluctuation percentage is reduced so as to more intuitively reflect the fluctuation degree of the flow and provide a basis for experimental analysis.
In some embodiments, the measured flow values are analyzed in step 150
Figure 28467DEST_PATH_IMAGE001
The step of fluctuating situation of (a) comprises:
step 150A, plotting the absolute fluctuation amount of the flow
Figure 978712DEST_PATH_IMAGE004
According to time
Figure 450014DEST_PATH_IMAGE002
To analyze the amount of absolute fluctuation of the flow rate
Figure 534644DEST_PATH_IMAGE004
(ii) a change in (c);
150B, drawing the relative conversion rotating speed at any moment in time on the same time axis
Figure 188742DEST_PATH_IMAGE002
The variation curve of (d);
step 150C, analyzing the absolute fluctuation amount of the flow
Figure 557275DEST_PATH_IMAGE004
The change condition of the rotating speed is changed along with different relative conversion rotating speeds.
This embodiment converts the absolute fluctuation amount of the flow rate
Figure 629837DEST_PATH_IMAGE004
Measured value according to flow
Figure 467343DEST_PATH_IMAGE001
And the relative conversion speed of the rotor
Figure 158087DEST_PATH_IMAGE002
The change curves are drawn into the same coordinate system, and the flow absolute fluctuation quantity can be visually analyzed from the change graph
Figure 882592DEST_PATH_IMAGE004
At different times
Figure 446428DEST_PATH_IMAGE002
Can also compare the absolute fluctuation quantity of the flow under different relative conversion rotating speeds
Figure 489340DEST_PATH_IMAGE004
The variation of (2). If the detection accuracy of the flow rate detecting part (e.g. flow rate detecting part)The test requirement is difficult to achieve, but the flow detection component cannot be replaced, so that the throttling ratio can be adjusted to avoid the interval with larger flow fluctuation as much as possible when a test strategy is customized.
For example, FIG. 3 shows the absolute fluctuation of the flow rate in test A
Figure 747889DEST_PATH_IMAGE004
Over time
Figure 825436DEST_PATH_IMAGE002
The change curve is B3, the absolute fluctuation quantity of the flow
Figure 763436DEST_PATH_IMAGE004
The fluctuation is large; further, the relative scaled rotation speeds over time are given in fig. 3 in the same coordinate system
Figure 857425DEST_PATH_IMAGE002
Curve a3, from which the absolute fluctuation of the flow rate can be seen
Figure 93234DEST_PATH_IMAGE004
As a function of the relative scaled rotation speed.
FIG. 4 shows the absolute fluctuation of the flow rate in test B
Figure 838336DEST_PATH_IMAGE004
Over time
Figure 700900DEST_PATH_IMAGE002
The change curve is B4, the absolute fluctuation quantity of the flow
Figure 718403DEST_PATH_IMAGE004
The fluctuation is small; further, the relative scaled rotation speeds over time are given in fig. 4 in the same coordinate system
Figure 56106DEST_PATH_IMAGE002
Curve a4, from which the absolute fluctuation of the flow rate can be seen
Figure 137938DEST_PATH_IMAGE004
As a function of the relative scaled rotation speed.
In some embodiments, the measured flow values are analyzed in step 150
Figure 135850DEST_PATH_IMAGE001
The step of fluctuating situation of (a) comprises:
step 150D, drawing the relative fluctuation quantity of the flow
Figure 283060DEST_PATH_IMAGE005
According to time
Figure 719726DEST_PATH_IMAGE002
To analyze the relative fluctuation amount of the flow
Figure 345747DEST_PATH_IMAGE005
(ii) a change in (c);
step 150E, drawing the relative conversion rotating speed at any moment in time under the same time axis
Figure 842456DEST_PATH_IMAGE002
The variation curve of (d);
step 150F, analyzing the relative fluctuation amount of the flow
Figure 273700DEST_PATH_IMAGE005
The change condition of the rotating speed is changed along with different relative conversion rotating speeds.
This embodiment converts the relative fluctuation amount of the flow
Figure 264789DEST_PATH_IMAGE005
According to time
Figure 291520DEST_PATH_IMAGE002
And the relative conversion speed of the rotor
Figure 395349DEST_PATH_IMAGE002
The change curves are drawn into the same coordinate system, and the flow relative fluctuation quantity can be visually analyzed from the change graph
Figure 891052DEST_PATH_IMAGE005
At different times
Figure 669521DEST_PATH_IMAGE002
Can also compare the flow relative fluctuation amount under different relative conversion rotating speeds
Figure 255486DEST_PATH_IMAGE005
The variation of (2). And absolute fluctuation amount
Figure 844730DEST_PATH_IMAGE004
The combination of the change diagrams can more intuitively reflect the flow fluctuation condition, and provide a basis for the formulation of a test strategy and the analysis of a test result.
If the detection precision of the flow detection component (such as a flow tube) is difficult to meet the test requirement, but the flow detection component cannot be replaced, the throttling ratio can be adjusted to avoid the section with large flow fluctuation as much as possible when a test strategy is established.
For example, as shown in FIG. 5, the amount of relative fluctuation of the flow rate in test A
Figure 811418DEST_PATH_IMAGE005
Over time
Figure 835655DEST_PATH_IMAGE002
The change curve is B5, and the flow rate relative fluctuation quantity
Figure 587711DEST_PATH_IMAGE005
The fluctuation is large; further, the relative scaled rotation speeds over time are given in fig. 5 in the same coordinate system
Figure 534807DEST_PATH_IMAGE002
Curve A5, from which the relative fluctuation of the flow can be seen
Figure 490256DEST_PATH_IMAGE005
As a function of the relative scaled rotation speed.
As shown in figure 6Amount of relative fluctuation of flow in test B
Figure 626839DEST_PATH_IMAGE005
Over time
Figure 420352DEST_PATH_IMAGE002
The change curve is B6, and the flow rate relative fluctuation quantity
Figure 99201DEST_PATH_IMAGE005
The fluctuation is large; further, the relative scaled rotation speeds over time are given in fig. 6 in the same coordinate system
Figure 978164DEST_PATH_IMAGE002
Curve A6, from which the relative fluctuation of the flow can be seen
Figure 918439DEST_PATH_IMAGE005
As a function of the relative scaled rotation speed.
In some embodiments, the measured flow values are analyzed in step 150
Figure 67923DEST_PATH_IMAGE001
The step of fluctuating situation of (a) comprises:
step 150G, drawing the absolute fluctuation quantity of the flow
Figure 419138DEST_PATH_IMAGE004
Measured value according to flow
Figure 278073DEST_PATH_IMAGE001
The variation curve of (d);
step 150H, analyzing the absolute fluctuation amount of the flow
Figure 756459DEST_PATH_IMAGE004
Measured value according to flow
Figure 258985DEST_PATH_IMAGE001
To assist in analyzing the measurement accuracy of a flow sensing component used to measure compressor flow.
This embodiment is implemented by plotting the absolute fluctuation amount of the flow
Figure 548146DEST_PATH_IMAGE004
Along with the measured flow
Figure 136122DEST_PATH_IMAGE001
The variation graph can be used for assisting in analyzing the measurement accuracy of the flow detection component. Fig. 7 and 8 are examples of the case where the fluctuation of the flow rate is large and the fluctuation is small, respectively. The fluctuation of the measured value of the flow rate detection part (such as a flow tube) can be analyzed through the graph.
For example, FIG. 7 shows the absolute fluctuation of the flow rate in test A
Figure 103685DEST_PATH_IMAGE004
Measured value according to flow
Figure 273766DEST_PATH_IMAGE001
The variation curve is B7, and the fluctuation quantity is large; further, in fig. 7, the measured values of the relative converted rotational speed with the flow rate are shown in the same coordinate system
Figure 170047DEST_PATH_IMAGE001
Curve a7, from which the absolute fluctuation of the flow rate can be seen
Figure 809101DEST_PATH_IMAGE004
As a function of the relative scaled rotation speed.
FIG. 8 shows the absolute fluctuation of the flow rate in test B
Figure 816240DEST_PATH_IMAGE004
Measured value according to flow
Figure 106407DEST_PATH_IMAGE001
The variation curve is B8, and the fluctuation quantity is small; further, in fig. 8, the measured values of the relative converted rotational speed with the flow rate are shown in the same coordinate system
Figure 740300DEST_PATH_IMAGE001
Of the curve A8, therebyThe absolute fluctuation of the flow can be seen
Figure 302869DEST_PATH_IMAGE004
As a function of the relative scaled rotation speed.
In some embodiments, the measured flow values are analyzed in step 150
Figure 615164DEST_PATH_IMAGE001
The step of fluctuating situation of (a) comprises:
step 150I, drawing the relative fluctuation quantity of the flow
Figure 759837DEST_PATH_IMAGE005
Measured value according to flow
Figure 997920DEST_PATH_IMAGE001
The variation curve of (d);
step 150J, analyzing the relative fluctuation quantity of the flow
Figure 546320DEST_PATH_IMAGE005
Measured value according to flow
Figure 957579DEST_PATH_IMAGE001
To assist in analyzing the measurement accuracy of a flow sensing component used to measure compressor flow.
This embodiment is implemented by plotting the relative fluctuation amount of the flow
Figure 910753DEST_PATH_IMAGE005
Along with the measured flow
Figure 54159DEST_PATH_IMAGE001
The variation graph can be used for assisting in analyzing the measurement accuracy of the flow detection component. Fig. 9 and 10 are examples of the case where the fluctuation of the flow rate is large and the fluctuation is small, respectively. The fluctuation of the measured value of the flow rate detection part (such as a flow tube) can be analyzed through the graph.
For example, as shown in FIG. 9, the amount of relative fluctuation of the flow rate in test A
Figure 919933DEST_PATH_IMAGE005
Measured value according to flow
Figure 10248DEST_PATH_IMAGE001
The variation curve is B9, and the fluctuation quantity is large; further, in fig. 9, the measured values of the relative converted rotational speed with the flow rate are shown in the same coordinate system
Figure 880247DEST_PATH_IMAGE001
Curve A7, from which the relative fluctuation of the flow can be seen
Figure 460132DEST_PATH_IMAGE005
As a function of the relative scaled rotation speed.
FIG. 10 shows the relative fluctuation of the flow rate in test B
Figure 32059DEST_PATH_IMAGE005
Measured value according to flow
Figure 221339DEST_PATH_IMAGE001
The variation curve is B10, and the fluctuation quantity is small; further, in fig. 10, the measured values of the relative converted rotational speed with the flow rate are shown in the same coordinate system
Figure 709958DEST_PATH_IMAGE001
Curve A10, from which the relative fluctuation of the flow can be seen
Figure 962210DEST_PATH_IMAGE005
As a function of the relative scaled rotation speed.
In some embodiments, in the case where it is analyzed through steps 150G to 150H or steps 150I to 150J that the measurement accuracy of the flow rate detection part is lower than the preset accuracy, the compressor test flow rate measurement analysis method further includes:
the method for improving the flow measurement accuracy comprises at least one of the following methods: replacing the flow detection part; adjusting the throttle ratio of the compressor to enable the relative conversion rotating speed to avoid the interval with large flow fluctuation; and comparing the flow rate before and after the replacement of the flow rate detection partFor amount of wave motion
Figure 21433DEST_PATH_IMAGE004
And/or the amount of relative fluctuation of the flow
Figure 515868DEST_PATH_IMAGE005
Measured value according to flow
Figure 363388DEST_PATH_IMAGE001
The change curve of (2).
This embodiment is based on the absolute fluctuation amount of the flow
Figure 285076DEST_PATH_IMAGE004
And/or the amount of relative fluctuation of the flow
Figure 520011DEST_PATH_IMAGE005
And analyzing, wherein the result can provide reference for the formulation of a test strategy, and if the test precision tester of the flow detection part cannot accept, the flow detection part needs to be replaced. If the condition is not satisfied and the flow rate detection unit cannot be replaced, measures (for example, adjustment of the throttle ratio) are required to avoid the section with large flow rate fluctuation as much as possible when the test strategy is established.
If the flow detection part is replaced in the test process, the method can also be used for comparing the absolute fluctuation quantity of the flow before and after the replacement of the flow detection part
Figure 365607DEST_PATH_IMAGE004
And/or the amount of relative fluctuation of the flow
Figure 563239DEST_PATH_IMAGE005
Along with the measured flow
Figure 468878DEST_PATH_IMAGE001
The change chart of (2) is compared and analyzed with the fluctuation difference of the flow before and after replacement, and whether the replacement of the flow detection part has the effect or not is analyzed.
In some embodiments, the compressor test flow measurement analysis method further comprises:
performing at least two tests on the flow measurement of the compressor;
the flow fluctuations in at least two experiments were compared.
The embodiment can be used for comparing the fluctuation of the flow in different compressor tests by comparing the flow data in two different compressor tests, and provides reference for comparison of performance data.
Secondly, this disclosure still provides a compressor test flow measuring device, includes: and the analysis component is configured to execute the compressor test flow measurement analysis method of the embodiment.
In some embodiments, the compressor test flow measurement system further comprises: the flow rate detection component is configured to measure the compressor flow rate, for example, the flow rate detection component may employ a flow tube.
Thirdly, the present disclosure also provides a compressor testing system, including: the compressor test flow measurement system of the above embodiment.
The compressor test flow analysis method is described below by way of two examples.
The first embodiment is as follows: take the measured flow fluctuation analysis of a certain compressor test (marked as test A) as an example. The frequency f of acquiring the test flow data of the compressor is 20Hz, namely, 20 time values and 20 measured flow values are acquired per second.
First, for each moment
Figure 188179DEST_PATH_IMAGE002
Calculate the time of day
Figure 86734DEST_PATH_IMAGE002
Lower fit stable flow
Figure 578021DEST_PATH_IMAGE003
. Selecting the moment
Figure 654561DEST_PATH_IMAGE002
The measured flow rate values at 200 times before and after (including the measured flow rate values at 100 times before 5 seconds before the time and the measured flow rate values at 5 seconds after the time)Actual measurement flow rate value at 100 times), and 200 actual measurement values corresponding to the 200 flow rates at the 200 times are calculated
Figure 362623DEST_PATH_IMAGE001
As an average value of
Figure 557544DEST_PATH_IMAGE002
Fitting steady flow at time
Figure 401872DEST_PATH_IMAGE003
：
Figure 649314DEST_PATH_IMAGE009
Second step, for each moment
Figure 408454DEST_PATH_IMAGE002
Calculate the time of day
Figure 586494DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
Figure 363957DEST_PATH_IMAGE004
：
Figure 530103DEST_PATH_IMAGE010
Third, for each moment
Figure 212757DEST_PATH_IMAGE002
Calculate the time of day
Figure 741959DEST_PATH_IMAGE002
Relative fluctuation amount of downward flow
Figure 124661DEST_PATH_IMAGE005
：
Figure 166435DEST_PATH_IMAGE011
And fourthly, analyzing results.
As shown in FIG. 3, the absolute fluctuation amount of the flow rate is plotted
Figure 883855DEST_PATH_IMAGE004
Over time
Figure 970410DEST_PATH_IMAGE002
Was analyzed according to the change curve B3. Fig. 3 also shows a curve a3 of the relative converted rotational speed over time. The absolute fluctuation amount of the flow can be visually seen from the graph
Figure 909416DEST_PATH_IMAGE004
Is detected. Meanwhile, the flow absolute fluctuation amount under different rotating speeds can be compared through the rotating speed curve
Figure 669561DEST_PATH_IMAGE004
Is detected. As shown in FIG. 3, in the time period of 1000-1800 seconds, the compressor is always at 60% relative conversion speed, and the absolute fluctuation amount (peak-to-peak value difference) of the flow is about 1.2 kg/s. In the 1900 th-2400 th second time period, the compressor is always in 80% of relative conversion rotating speed, and the absolute fluctuation amount of the flow is about 1.5 kg/s. In the 3200-5000 second time period, the gas compressor is always in 100% relative conversion rotating speed, and the absolute fluctuation quantity of the flow is
Figure 625010DEST_PATH_IMAGE004
About 1.8 kg/s. Namely, in the compressor test, the absolute fluctuation amount of the flow rate is calculated at the relative conversion rotating speed of 60%, 80% and 100%
Figure 948544DEST_PATH_IMAGE004
1.2kg/s, 1.5kg/s and 1.8kg/s, respectively, and comparing the rotation speeds, the absolute fluctuation amount of the flow rate at 100% rotation speed
Figure 555106DEST_PATH_IMAGE004
The fluctuation is the largest.
As shown in FIG. 5, the flow rate relative fluctuation amount is plotted
Figure 233956DEST_PATH_IMAGE005
Over time
Figure 112919DEST_PATH_IMAGE002
Curve B5. A curve a5 of the relative converted rotational speed over time can be plotted on fig. 5. The relative fluctuation of the flow can be visually seen from FIG. 5
Figure 787614DEST_PATH_IMAGE005
Is detected. Meanwhile, the relative fluctuation quantity of the flow under different rotating speeds can be compared through the rotating speed curve
Figure 671518DEST_PATH_IMAGE005
Is detected. As shown in fig. 5, in the time period of 1000 to 1800 seconds, the compressor is always at 60% relative conversion speed, and the relative fluctuation amount (peak-to-peak value difference) of the flow rate is about 6%. In the 1900 th-2400 th second time period, the compressor is always in 80% relative conversion rotating speed, and the relative fluctuation amount (peak-to-peak value difference) of the flow is about 5.5%. In the 3200-5000 second time period, the compressor is always in 100% relative conversion rotating speed, and the relative fluctuation amount (peak-to-peak value difference) of the flow is about 4%. Namely, in the compressor test, the flow rate relative fluctuation amount was measured at relative conversion rotational speeds of 60%, 80% and 100%
Figure 553892DEST_PATH_IMAGE005
Respectively 6%, 5.5% and 4%, and the relative fluctuation amount of flow at 60% rotation speed is compared
Figure 733201DEST_PATH_IMAGE005
And max.
As shown in FIG. 9, the flow rate relative fluctuation amount is plotted
Figure 711389DEST_PATH_IMAGE005
Measured value according to flow
Figure 213914DEST_PATH_IMAGE001
Curve B9, which is generally useful as an aid in analyzing the measurement accuracy of the flow tube. As shown in FIG. 9, the abscissa represents the measured value of the flow rate
Figure 440758DEST_PATH_IMAGE001
The ordinate is the measured value of the corresponding flow
Figure 841784DEST_PATH_IMAGE001
Relative fluctuation amount of flow of measured value of lower flow pipe
Figure 373128DEST_PATH_IMAGE005
Size. As can be seen from FIG. 9, in this embodiment, the fluctuation of the flow rate is small below 15kg/s, and is serious above 15kg/s, the maximum fluctuation of the measured value is about 6%, and the measurement deviation of the flow tube may be large above 15 kg/s. The analysis result can provide reference for the formulation of a test strategy, and if the test precision tester of the flow tube cannot accept the analysis result, the flow tube needs to be replaced. If the conditions are not met and the flow tube cannot be replaced, measures (such as adjusting the throttling ratio) are required to avoid the interval with large flow fluctuation of more than 15kg/s as much as possible when a test strategy is established. If the flow tube is replaced in the test process, the flow fluctuation change before and after replacement can be contrasted and analyzed through a flow relative fluctuation quantity changing chart along with the actually measured flow before and after replacement, and whether the effect of replacing the flow tube is achieved or not is analyzed.
As shown in FIG. 7, the absolute fluctuation amount of the flow rate is plotted
Figure 494275DEST_PATH_IMAGE004
Measured value according to flow
Figure 203605DEST_PATH_IMAGE001
Curve B7, which can be used to assist in analyzing the accuracy of the flow tube measurements, which is similar to the amount of flow relative fluctuation
Figure 75615DEST_PATH_IMAGE005
Measured value according to flow
Figure 584219DEST_PATH_IMAGE001
Analysis of the variation graph of (i.e., fig. 9).
Example two; in this example, the results of two compressor tests (denoted as test a and test B, respectively) were analyzed by comparison.
Taking a certain compressor test (marked as test B) as an example, comparing the actual measurement flow rate result of the compressor test A in the first embodiment, the difference of the actual measurement flow rate fluctuation amplitude in the two compressor tests can be analyzed, and the comparison work of the performance data of the two tests can be assisted. Fitting of Stable flow in test B
Figure 874386DEST_PATH_IMAGE003
Absolute fluctuation amount of flow
Figure 269464DEST_PATH_IMAGE004
Relative fluctuation amount of flow
Figure 379502DEST_PATH_IMAGE005
Reference is made to the procedure of experiment a in example one.
Amount of relative fluctuation of flow
Figure 429147DEST_PATH_IMAGE005
Over time
Figure 88668DEST_PATH_IMAGE002
The change chart of (2) is analyzed in comparison. FIG. 5 and FIG. 6 show the relative fluctuation amounts of flow in test A and test B, respectively
Figure 405380DEST_PATH_IMAGE005
Over time
Figure 753447DEST_PATH_IMAGE002
The variation of (2). As shown in fig. 5, in the compressor test a, the flow fluctuation is large at the rotation speed of more than 60%, the test accuracy is poor, and the flow fluctuation range is small at the rotation speed of less than 60%, the test accuracy is relatively good. As shown in FIG. 6, in the compressor test B, the relative fluctuation of the flow of the compressor at each rotating speed can be obviously seenThe quantity is very small, and the test precision is better. Therefore, when comparing the performance data of the test A and the test B, the flow fluctuation of two tests below 60% of the rotating speed is small, the measurement precision is good, the reliability of the test data is high, and the data of the two tests are comparable. And at more than 60% of rotating speed, in two tests, the flow fluctuation of the test A is large, and the difference caused by the test deviation needs to be considered when the performance data of the test A and the test B are compared.
Absolute fluctuation amount of flow
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Over time
Figure 101568DEST_PATH_IMAGE002
The change chart of (2) is analyzed in comparison. FIG. 3 and FIG. 4 show the absolute fluctuation amounts of the flow rates in test A and test B, respectively
Figure 336984DEST_PATH_IMAGE004
Over time
Figure 421615DEST_PATH_IMAGE002
The analysis method is similar to the flow relative fluctuation amount
Figure 574248DEST_PATH_IMAGE005
Over time
Figure 444246DEST_PATH_IMAGE002
Comparative analysis of the change patterns (fig. 5 and 6).
Amount of relative fluctuation of flow
Figure 571602DEST_PATH_IMAGE005
Measured value according to flow
Figure 658375DEST_PATH_IMAGE001
And comparing and analyzing the change chart, wherein the chart generally reflects the testing precision of the flow tube used in the compressor test, and the comparison generally compares the testing precision difference of the flow tube used in the two tests. FIGS. 9 and 10 show the relative fluctuation amounts of the flow rates in test A and test B, respectively
Figure 841795DEST_PATH_IMAGE005
Measured value according to flow
Figure 81147DEST_PATH_IMAGE001
The variation of (2). As shown in fig. 9, the maximum fluctuation amount of the flow tube measurement value used in the compressor test a is about 6%, the fluctuation of the flow rate below 15kg/s is small, the fluctuation of the flow rate above 15kg/s is serious, and the measurement deviation is large. The fluctuation of the measurement result of the flow tube used in the test B is smaller in the range of 0-48 kg/s, the precision of the flow tube used in the test A is better than that of the flow tube used in the test A, and if the test A and the test B are the test results before and after the flow tube is replaced in the same test, the effect of replacing the flow tube is obvious.
Absolute fluctuation amount of flow
Figure 628672DEST_PATH_IMAGE004
Measured value according to flow
Figure 641889DEST_PATH_IMAGE001
And (5) comparing and analyzing the change graphs. FIGS. 7 and 8 show the absolute fluctuation amounts of the flow rates in test A and test B, respectively
Figure 949374DEST_PATH_IMAGE004
Measured value according to flow
Figure 964603DEST_PATH_IMAGE001
Variation diagram, analysis method of which resembles the amount of relative fluctuation of flow
Figure 447144DEST_PATH_IMAGE005
Measured value according to flow
Figure 993663DEST_PATH_IMAGE001
The variation plots (fig. 9 and 10) were analyzed in comparison.
Therefore, the analysis method of the embodiment can at least achieve the following technical effects:
1. the method can accurately analyze the amplitude of flow fluctuation for the problem of large flow fluctuation in the process of testing the gas compressor, and provides reference for flow measurement accuracy analysis.
2. The flow measuring device can analyze the measurement accuracy of the flow pipe, and analyze the flow fluctuation, the flow measurement accuracy and the effectiveness of flow measurement data of the flow pipe in different flow measurement ranges; moreover, whether the flow tube is replaced can be evaluated by analyzing the fluctuation range difference of the measured flow values before and after the flow tube is replaced.
3. The flow fluctuation absolute quantity and the flow fluctuation relative quantity calculated by the method can be used for comparing the flow fluctuation under different rotating speeds under the condition of large difference of flow absolute values.
4. The flow fluctuation conditions in two different tests can be compared, and the flow fluctuation conditions before and after the flow tube is replaced in one test can also be compared. However, before comparing the performance data of the test results, the data validity of the test flow parameters needs to be evaluated.
The embodiments provided by the present disclosure are described in detail above. The principles and embodiments of the present disclosure are explained herein using specific examples, which are set forth only to help understand the method and its core ideas of the present disclosure. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present disclosure without departing from the principle of the present disclosure, and such improvements and modifications also fall within the scope of the claims of the present disclosure.

Claims (11)

1. A method for analyzing the flow measurement of a compressor test is characterized by comprising the following steps:
collecting flow measured value in compressor test process by preset frequency f
Figure 317515DEST_PATH_IMAGE001
；
For each moment of time
Figure 561414DEST_PATH_IMAGE002
Corresponding measured value of flow
Figure 84843DEST_PATH_IMAGE001
Calculate the time of day
Figure 781403DEST_PATH_IMAGE002
To stabilize the flow
Figure 409831DEST_PATH_IMAGE003
；
Calculating each time instant
Figure 773816DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
Figure 462286DEST_PATH_IMAGE004
；
Calculating each time instant
Figure 646143DEST_PATH_IMAGE002
Relative fluctuation amount of downward flow
Figure 78261DEST_PATH_IMAGE005
；
According to the absolute fluctuation amount of the flow
Figure 296753DEST_PATH_IMAGE004
And the amount of relative fluctuation of the flow
Figure 156124DEST_PATH_IMAGE005
Analyzing the measured value of the flow rate
Figure 827277DEST_PATH_IMAGE001
(ii) a fluctuating situation;
wherein the measured value of the flow rate is analyzed
Figure 797507DEST_PATH_IMAGE001
Step package of fluctuation situation ofComprises the following steps:
plotting absolute fluctuation amount of flow
Figure 932822DEST_PATH_IMAGE004
According to time
Figure 963095DEST_PATH_IMAGE002
To analyze the amount of absolute fluctuation of the flow rate
Figure 121544DEST_PATH_IMAGE004
(ii) a change in (c);
drawing relative conversion rotating speed at any moment under the same time axis
Figure 895465DEST_PATH_IMAGE002
The variation curve of (d);
analyzing the absolute fluctuation of flow
Figure 817110DEST_PATH_IMAGE004
The change condition along with different relative conversion rotating speeds; and/or
Analyzing the measured value of the flow
Figure 18285DEST_PATH_IMAGE001
The step of fluctuating situation of (a) comprises:
plotting relative fluctuation amount of flow
Figure 664030DEST_PATH_IMAGE005
According to time
Figure 241642DEST_PATH_IMAGE002
To analyze the relative fluctuation amount of the flow
Figure 23653DEST_PATH_IMAGE005
(ii) a change in (c);
drawing relative conversion rotating speed at any moment under the same time axis
Figure 395728DEST_PATH_IMAGE002
The variation curve of (d);
analyzing the relative fluctuation of flow
Figure 528769DEST_PATH_IMAGE005
The change condition of the rotating speed is changed along with different relative conversion rotating speeds.
2. The compressor test flow measurement analysis method of claim 1, wherein for each time instant, the flow measurement analysis method is applied
Figure 644493DEST_PATH_IMAGE002
Corresponding measured value of flow
Figure 546590DEST_PATH_IMAGE001
Calculate the time of day
Figure 89567DEST_PATH_IMAGE002
To stabilize the flow
Figure 709904DEST_PATH_IMAGE003
Comprises the following steps:
from time of day
Figure 363739DEST_PATH_IMAGE002
Firstly, selecting the measured flow values corresponding to the N time values forwards and backwards
Figure 120342DEST_PATH_IMAGE001
；
Calculating the measured flow value in 2N time values
Figure 99800DEST_PATH_IMAGE001
As the average value of time
Figure 879537DEST_PATH_IMAGE002
To stabilize the flow
Figure 337063DEST_PATH_IMAGE003
。
3. The compressor test flow measurement analysis method of claim 1, wherein each time instant is calculated
Figure 213752DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
Figure 104391DEST_PATH_IMAGE004
Comprises the following steps:
each time point
Figure 433741DEST_PATH_IMAGE002
Measured value of flow
Figure 694958DEST_PATH_IMAGE001
Subtracting the fitted steady flow
Figure 426154DEST_PATH_IMAGE003
As time of day
Figure 481835DEST_PATH_IMAGE002
Amount of absolute fluctuation of flow rate of
Figure 298481DEST_PATH_IMAGE004
。
4. The compressor test flow measurement analysis method of claim 1, wherein each time instant is calculated
Figure 97810DEST_PATH_IMAGE002
Relative fluctuation amount of downward flow
Figure 683512DEST_PATH_IMAGE005
Comprises the following steps:
each time point
Figure 175673DEST_PATH_IMAGE002
Absolute fluctuation amount of downward flow
Figure 541932DEST_PATH_IMAGE004
Divided by the time of day
Figure 879373DEST_PATH_IMAGE002
To stabilize the flow
Figure 585160DEST_PATH_IMAGE003
To obtain the time of day
Figure 982644DEST_PATH_IMAGE002
Relative fluctuation amount of flow rate of
Figure 773882DEST_PATH_IMAGE005
。
5. The method for analyzing compressor test flow measurement according to claim 1, wherein the measured flow value is analyzed
Figure 915014DEST_PATH_IMAGE001
The step of fluctuating situation of (a) comprises:
plotting absolute fluctuation amount of flow
Figure 492886DEST_PATH_IMAGE004
Measured value according to flow
Figure 326850DEST_PATH_IMAGE001
The variation curve of (d);
analyzing the absolute fluctuation of flow
Figure 339805DEST_PATH_IMAGE004
Measured value according to flow
Figure 284627DEST_PATH_IMAGE001
To assist in analyzing the measurement accuracy of a flow sensing component used to measure compressor flow.
6. The method for analyzing compressor test flow measurement according to claim 1, wherein the measured flow value is analyzed
Figure 699428DEST_PATH_IMAGE001
The step of fluctuating situation of (a) comprises:
plotting relative fluctuation amount of flow
Figure 641976DEST_PATH_IMAGE005
Measured value according to flow
Figure 142228DEST_PATH_IMAGE001
The variation curve of (d);
analyzing the relative fluctuation of flow
Figure 625162DEST_PATH_IMAGE005
Measured value according to flow
Figure 160048DEST_PATH_IMAGE001
To assist in analyzing the measurement accuracy of a flow sensing component used to measure compressor flow.
7. The compressor test flow measurement analysis method according to claim 5 or 6, wherein in a case where it is analyzed that the measurement accuracy of the flow detection part is lower than a preset accuracy, the compressor test flow measurement analysis method further includes:
the method for improving the flow measurement accuracy comprises at least one of the following modes: replacing the flow detection part; adjusting the throttle ratio of the compressor to enable the relative conversion rotating speed to avoid the interval with large flow fluctuation; and comparing the flow rate detecting member withAbsolute fluctuation amount of flow before and after change
Figure 335815DEST_PATH_IMAGE004
Measured value according to flow
Figure 323362DEST_PATH_IMAGE001
The change curve of (2).
8. The compressor test flow measurement analysis method of claim 1, further comprising:
performing at least two tests on the flow measurement of the compressor;
and comparing the flow fluctuation conditions in the at least two tests.
9. An apparatus for measuring and analyzing a compressor test flow, characterized by being used for carrying out the method for measuring and analyzing the compressor test flow according to any one of claims 1 to 8.
10. An air compressor test flow measurement system, comprising:
the compressor test flow measurement analysis device of claim 9; and
a flow detection component configured to measure compressor flow.
11. A compressor testing system, comprising: a compressor test flow measurement analysis device as claimed in claim 9, or a compressor test flow measurement system as claimed in claim 10.
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