CN111272385B - A Test Device for Visualizing Strong Transient Cavitation Flows in Tubes - Google Patents
A Test Device for Visualizing Strong Transient Cavitation Flows in Tubes Download PDFInfo
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- CN111272385B CN111272385B CN202010111587.9A CN202010111587A CN111272385B CN 111272385 B CN111272385 B CN 111272385B CN 202010111587 A CN202010111587 A CN 202010111587A CN 111272385 B CN111272385 B CN 111272385B
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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
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/18—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance
- G01P5/20—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the time taken to traverse a fixed distance using particles entrained by a fluid stream
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/26—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave
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Abstract
本发明涉及一种用于可视化管内强瞬变空化流的试验装置，包括：直管部，多个所述直管部首尾顺次呈折弯型布置；可视弯管部，连接位于抬高点的相邻两所述直管部；非可视弯管部，连接位于低点的相邻两所述直管部；由此，所述直管部、可视弯管部和非可视弯管部形成连续的“Z”型试验段，且所述试验段所处平面与地面垂直，以使所述试验段的抬高点处产生多节点空化类型及完全断流型大空腔。本发明可以实现针对管内强瞬变空化流的复杂多节点空化、完全断流型大空腔、压力波动及空化区流场特性等细节和机理进行深入研究。
The invention relates to a test device for visualizing strong transient cavitation flow in a pipe. The two adjacent straight pipe parts at the high point; the non-visible curved pipe parts are connected to the two adjacent straight pipe parts located at the low point; A continuous "Z"-shaped test section is formed by the elbow section, and the plane of the test section is perpendicular to the ground, so that a multi-node cavitation type and a complete cut-off type large cavity are generated at the elevated point of the test section. . The invention can realize in-depth research on the details and mechanisms of the complex multi-node cavitation, the complete cut-off type large cavity, the pressure fluctuation and the flow field characteristics of the cavitation zone of the strong transient cavitation flow in the pipe.
Description
Technical Field
The invention relates to a water hammer test device, in particular to a test device for visualizing strong transient cavitation flow in a pipe, and belongs to the technical field of hydraulic engineering.
Background
In modern hydraulic pipeline systems such as large-scale water delivery and water transfer, heat supply pipe networks and the like, parts of the water delivery pipeline which are suddenly raised, reduced and even fluctuated change often exist due to the limitation of topography, when a pump is suddenly stopped or a valve is closed in the hydraulic pipeline system, the caused sudden change of the flow velocity in the pipe can cause the generation of strong transient cavitation flow phenomena such as complete flow interruption type large cavity and water column separation-reclosing water hammer and the like at the above parts, thereby generating great harm and influence on the safe and stable operation of the hydraulic pipeline system. However, at present, the knowledge of complex details and mechanisms such as cavitation phase change, gas-liquid two-phase mass transport and pressure fluctuation in the process accompanied with strong transient cavitation flow is not sufficient, and further intensive research is needed.
At present, it is a practical and effective means to simulate the change of the pipeline in the actual engineering by a test method, and to utilize the visualization technologies such as a high-precision sensor, an advanced test data acquisition system, and a PIV (Particle Image Velocimetry) to study the strong transient cavitation flow phenomenon in the pipe. The existing test device aiming at the transient cavitation flow of the pipeline mainly has two types: one is mainly made of copper pipes or stainless steel and other materials, has higher pressure-bearing strength, and can obtain pressure fluctuation in the strong transient cavitation flow process; and the other one adopts organic glass and other materials, has limited pressure bearing strength, but can observe the evolution law of the weak transient cavitation flow cavity in the pipe through high-speed photography.
Disclosure of Invention
In view of the above problems, the present invention provides a test device for visualizing strong transient cavitation flow in a pipe, which is capable of generating multi-node cavitation and a completely-cutoff large cavity.
In order to achieve the purpose, the invention adopts the following technical scheme: a test apparatus for visualizing strong transient cavitation flow in a pipe, comprising: the straight pipe parts are sequentially arranged end to end in a bent mode; the visible bent pipe part is connected with two adjacent straight pipe parts at the lifting point; the invisible bent pipe part is connected with two adjacent straight pipe parts at a low point; therefore, the straight pipe part, the visible bent pipe part and the invisible bent pipe part form a continuous Z-shaped test section, and the plane of the test section is vertical to the ground, so that a multi-node cavitation type and a complete flow breaking type large cavity are generated at the lifting point of the test section.
In the test device, preferably, the straight pipe portions are at least two pairs of straight pipe portions with different lengths, each pair of straight pipe portions has the same length, the visible elbow portion is connected with two adjacent straight pipe portions with the same length, and the non-visible elbow portion is connected with two adjacent straight pipe portions with different lengths.
The test device is preferably characterized in that the test section is a descending Z-shaped pipeline, namely, the lengths of at least two pairs of straight pipe parts are gradually reduced from upstream to downstream along the flow direction;
or the test section is a gradually rising Z-shaped pipeline, namely the lengths of at least two pairs of straight pipe parts are gradually increased from upstream to downstream along the flow direction;
or the test section is an undulating Z-shaped pipeline, namely the lengths of more than three pairs of straight pipe parts along the flow direction are high in the middle and low on two sides or high on two sides and low in the middle.
The test device, preferably, the visual elbow portion includes: the cross section of the arc-shaped pipe is in an inner circle and an outer square shape, namely the inner wall surface of the arc-shaped pipe is circular, the inner diameter of the arc-shaped pipe is kept unchanged, and the outer wall surface of the arc-shaped pipe is square; and the two transition straight pipes are respectively and integrally connected to the two ends of the arc-shaped pipe, so that the cross section of the arc-shaped pipe is transited from an inner circle and outer square shape to an inner circle and outer circle shape.
The testing device, preferably, the straight tube portion with the visual bent tube portion adopts flexible connection, namely two of visual bent tube portion the transition straight tube tip respectively with adjacent two straight tube portion tip coincidence to adopt flexible hose of wire and clamp to fasten in the coincidence department.
Preferably, the straight pipe part is a stainless steel straight pipe, and the invisible bent pipe part is a stainless steel bent pipe.
The testing device, preferably, the visual elbow portion is transparent organic glass elbow.
Preferably, two adjacent straight pipe parts with the same length are arranged at an included angle of 60 degrees, 90 degrees or 120 degrees.
Correspondingly, the arc-shaped pipe is an arc-shaped pipe with a central angle of 60 degrees, 90 degrees or 120 degrees.
Preferably, the test device is provided with a plurality of monitoring/drainage holes on one side wall surface of the arc-shaped pipe at equal intervals along the flow direction, and the monitoring/drainage holes are used for connecting a pressure pulsation sensor and/or a temperature and humidity sensor and performing fluid drainage sampling.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. the invention adopts the stainless steel straight pipe and the transparent organic glass bent pipe at the same time, compared with the existing device, the invention can not only meet the pressure bearing requirement of strong transient cavitation flow in the pipe, but also carry out visual observation of the cavitation flow field. 2. The organic glass bent pipe and the stainless steel straight pipe are flexibly connected, so that the replacement is convenient, and test sections with different waveforms can be configured according to requirements. 3. The cross section of the organic glass bent pipe is in an inner circle and outer square form, and multi-dimensional cavitation development, cavity evolution and flow field information on different cross sections parallel to and perpendicular to the flow direction can be obtained during high-speed photography and PIV visual tests. 4. According to the invention, the monitoring/drainage hole is formed in the side wall surface of the organic glass bent pipe, so that the organic glass bent pipe not only can be connected with a high-precision pressure pulsation sensor and a temperature and humidity sensor, but also can be used for conducting fluid drainage sampling during testing, and further research on details and mechanisms such as pressure change in a strong transient cavitation flow process, a cavity thermodynamic process and the like is realized.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a view showing the structure of a visible elbow part of the present invention;
FIG. 3 is a schematic view of the construction of the wire hose of the present invention;
fig. 4 is a schematic view of the structure of the clamp of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.
As shown in FIG. 1, the test device for visualizing strong transient cavitation flow in a pipe provided by the invention comprises: the straight pipe parts 1 are sequentially arranged end to end in a bent mode; the visible bent pipe part 2 is connected with two adjacent straight pipe parts 1 positioned at the lifting point; and a non-visible elbow part 3 connecting two adjacent straight pipe parts 1 at a low point. Therefore, the straight pipe part 1, the visible bent pipe part 2 and the invisible bent pipe part 3 form a continuous Z-shaped test section, and the plane of the test section is vertical to the ground. When the device is used for testing, the liquid column near the lifting point can generate stretching effects of different degrees to the cavity under the action of gravity. Therefore, compared with the common test device, the test device can generate multi-node cavitation and a complete flow-breaking type large cavity.
In the above embodiment, preferably, the straight pipe portions 1 are at least two pairs of straight pipe portions 1 having different lengths, but each pair of straight pipe portions 1 has the same length, and the visible elbow portion 2 connects two adjacent straight pipe portions 1 having the same length, and the non-visible elbow portion 3 connects two adjacent straight pipe portions 2 having different lengths.
In the above embodiment, preferably, the test section is a descending Z-shaped pipe, i.e. at least two pairs of straight pipe portions 1 decrease in length from upstream to downstream in the flow direction; or the test section is a gradually rising Z-shaped pipeline, namely the lengths of at least two pairs of straight pipe parts 1 are gradually increased from upstream to downstream in the flow direction; or the test section is an undulating Z-shaped pipeline, namely the lengths of more than three pairs of straight pipe parts 1 along the flow direction are high in the middle and low on two sides or high on two sides and low in the middle. Therefore, the test section of the three pipeline types can basically duplicate various pipeline states encountered in engineering or test.
In the above embodiment, preferably, the visible elbow part 2 includes: the cross section of the arc-shaped pipe 21 is in an inner circle and an outer square shape, namely the inner wall surface of the arc-shaped pipe 21 is circular, the inner diameter of the arc-shaped pipe is kept unchanged, and the outer wall surface of the arc-shaped pipe is square; the two transition straight pipes 22 are respectively and integrally connected to two ends of the arc-shaped pipe 21, so that the cross section of the arc-shaped pipe 21 is transited from an inner circle and outer square shape to an inner circle and outer circle shape. Therefore, when the PIV visual test is carried out, the outer wall surface of the arc-shaped tube 21 is square, so that when the light is emitted by using a Yag laser, the light can be emitted in any direction perpendicular to the upper wall surface and the lower wall surface or the front side wall surface and the rear side wall surface of the arc-shaped tube 21, and corresponding high-speed photography can be carried out on shooting in the direction parallel to the flow or in the direction perpendicular to the flow and the like, so that the multi-dimensional space real-time observation on the evolution of cavities and the flow field distribution on different sections parallel to or perpendicular to the flow direction is realized.
In the above embodiment, preferably, the straight pipe portion 1 and the visible elbow portion 2 are flexibly connected, that is, the end portions of the two transition straight pipes 22 of the visible elbow portion 2 are respectively overlapped with the end portions of the two adjacent straight pipe portions 1, and the steel wire hose 4 and the clamp 5 are used for fastening at the overlapped portion.
In the above embodiment, preferably, the straight pipe portion 1 is a stainless steel straight pipe, and the non-visible bent pipe portion 3 is a stainless steel bent pipe, and the materials of the stainless steel bent pipe and the non-visible bent pipe portion are stainless steel 304, so as to improve the strength of the test section.
In the above embodiment, preferably, the visible bent pipe portion 2 is a transparent organic glass bent pipe made of high-strength tempered organic glass.
In the above embodiment, preferably, two adjacent straight pipe portions 1 with the same length are arranged at an included angle of 60 °, 90 ° or 120 °; correspondingly, the arc tube 21 is an arc tube with a central angle of 60 °, 90 ° or 120 °.
In the above embodiment, preferably, a plurality of monitoring/drainage holes 23 are formed in one side wall surface of the arc-shaped tube 21 at equal intervals along the flow direction, the monitoring/drainage holes 23 can be connected with a high-precision pressure pulsation sensor during testing, a temperature and humidity sensor, and fluid drainage sampling can be performed at the monitoring/drainage holes 23, so that real-time accurate measurement of pressure fluctuation in the strong transient cavitation flow process in the tube can be realized, and the problem of thermodynamic process index in the cavitation flow cavity can be determined.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010111587.9A CN111272385B (en) | 2020-02-24 | 2020-02-24 | A Test Device for Visualizing Strong Transient Cavitation Flows in Tubes |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010111587.9A CN111272385B (en) | 2020-02-24 | 2020-02-24 | A Test Device for Visualizing Strong Transient Cavitation Flows in Tubes |
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| CN111272385A CN111272385A (en) | 2020-06-12 |
| CN111272385B true CN111272385B (en) | 2021-06-29 |
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| CN101825543A (en) * | 2010-04-02 | 2010-09-08 | 浙江理工大学 | Circuit-type multiphase flow photoelectric image monitoring erosion test equipment |
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| CN103698102A (en) * | 2013-12-17 | 2014-04-02 | 哈尔滨工程大学 | Inter-tube-bundle high-temperature high-pressure vapor-liquid two-phase flow pattern experimental device and flow pattern identification method |
| CN107367372A (en) * | 2017-08-07 | 2017-11-21 | 西南石油大学 | A kind of multichannel water hole cavitation experimental provision |
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| CN209879921U (en) * | 2019-01-14 | 2019-12-31 | 杭州育泽科技有限公司 | Pipeline comprehensive experiment system device |
| CN210014897U (en) * | 2019-06-18 | 2020-02-04 | 中国石油天然气集团有限公司 | Experimental platform for measuring fluid state in oil pipe |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3215586B2 (en) * | 1994-11-01 | 2001-10-09 | 興和精機株式会社 | Flow observation device |
-
2020
- 2020-02-24 CN CN202010111587.9A patent/CN111272385B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825543A (en) * | 2010-04-02 | 2010-09-08 | 浙江理工大学 | Circuit-type multiphase flow photoelectric image monitoring erosion test equipment |
| CN102767340A (en) * | 2012-05-24 | 2012-11-07 | 中国石油大学(华东) | Multiphase flow regulation device and method for restraining slug flow by utilizing same |
| CN103698102A (en) * | 2013-12-17 | 2014-04-02 | 哈尔滨工程大学 | Inter-tube-bundle high-temperature high-pressure vapor-liquid two-phase flow pattern experimental device and flow pattern identification method |
| CN107367372A (en) * | 2017-08-07 | 2017-11-21 | 西南石油大学 | A kind of multichannel water hole cavitation experimental provision |
| CN108051180A (en) * | 2017-11-17 | 2018-05-18 | 中国石油大学(华东) | A kind of circulating multiphase flow fluctuating pipeline experimental rig, application and method |
| CN207937143U (en) * | 2018-04-01 | 2018-10-02 | 陈光凌 | A kind of simulation different terrain induces oil and gas multiphase flow the experimental provision of slug flow influence |
| CN209879921U (en) * | 2019-01-14 | 2019-12-31 | 杭州育泽科技有限公司 | Pipeline comprehensive experiment system device |
| CN210014897U (en) * | 2019-06-18 | 2020-02-04 | 中国石油天然气集团有限公司 | Experimental platform for measuring fluid state in oil pipe |
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| CN111272385A (en) | 2020-06-12 |
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