CN112504660A - Visual valve flow field-pressure pulsation coupling measurement experiment system - Google Patents
Visual valve flow field-pressure pulsation coupling measurement experiment system Download PDFInfo
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- CN112504660A CN112504660A CN202011284158.8A CN202011284158A CN112504660A CN 112504660 A CN112504660 A CN 112504660A CN 202011284158 A CN202011284158 A CN 202011284158A CN 112504660 A CN112504660 A CN 112504660A
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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
- G01M13/00—Testing of machine parts
- G01M13/003—Machine valves
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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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Abstract
The invention provides a visual valve flow field-pressure pulsation coupling measurement experiment system, which comprises a visual circulation loop and a pulsation pressure acquisition and light path system, wherein the pulsation pressure acquisition and light path system comprises a light source, a light filter, a high-frequency pulsation pressure sensor, a reflecting plane mirror, a high-speed camera, a computer and a data acquisition system; the laser light source is shot at the bottom of the valve by the plane reflector, the high-speed camera is arranged on the front face of the valve, the optical filter is arranged between the high-speed camera and the valve, and the universal data acquisition system and the high-speed camera are connected to the same computer. The synchronous controller controls the camera and the acquisition system to synchronously trigger, so that the synchronism in the coupling measurement engineering is fully ensured; the invention skillfully utilizes the plane reflector to design the light path according to the structural characteristics of the valve, and simultaneously carries out the adaptive pressure measuring hole opening mode according to the characteristics of the valve, thereby avoiding the influence on the flow field shooting and more accurately obtaining the internal pulsating pressure.
Description
Technical Field
The invention provides a visual valve flow field-pressure pulsation coupling measurement experiment system which is mainly applied to coupling measurement of a complex flow field-pulsation pressure field in a valve, researches on the flow field characteristic and the pressure pulsation characteristic in the valve are carried out under different flow working conditions, and the technical fields of hydrodynamics, optics, signal acquisition, nuclear safety and the like are mainly involved.
Background
The valve is one of devices which play a role in fluid transmission and control in modern industry, along with the progress of science and technology, the application range of the valve is wider and wider, and people pay more and more attention to the economy and the safety of the operation of the valve. The flowing of the working medium in the valve is an extremely complex compound movement, the performance of the valve depends on the internal flowing condition to a great extent, and in addition, high-frequency pressure pulsation caused by internal fluid can generate noise, so that the valve body vibrates and is outwards propagated through a pipeline, and the valve and a pipeline system can be damaged in serious conditions. Therefore, the research on the flow characteristic and the pressure pulsation characteristic of the flow field in the valve is significant for improving the structural design of the valve, improving the operation efficiency, saving energy and reducing noise. Although the existing visual measurement system can realize the full-field measurement of the valve flow field, the following defects still exist: firstly, due to the adoption of the combination of pulse laser and a frame-crossing camera, the continuous measurement on the flow field time sequence cannot be realized due to the limited working principle of the pulse laser; secondly, strong light reflection is easily caused at the valve boundary due to the particularity of the valve boundary, so that the valve boundary flow field cannot be accurately measured; thirdly, synchronous measurement of flow field characteristics and pressure pulsation characteristics cannot be realized, and practical experience of pressure pulsation measurement is lacked; therefore, it is necessary to design a visual valve flow field-pressure pulsation synchronous coupling measurement system to realize accurate and convenient synchronous measurement of the valve flow field characteristic and the pressure pulsation characteristic.
Disclosure of Invention
The invention aims to provide a visual valve flow field-pressure pulsation coupling measurement experiment system for well acquiring flow information and pressure pulsation information of a flow field.
The purpose of the invention is realized as follows:
a visual valve flow field-pressure pulsation coupling measurement experiment system comprises a visual circulation loop and a pulsating pressure acquisition and light path system, wherein the visual circulation loop comprises a circulation water tank, a working medium water tank, a coloring agent water tank, a heat exchanger, a main valve, an electromagnetic flowmeter, a vertical centrifugal pump, a frequency converter, a filter, a drainage tank, a three-way valve, an exhaust valve, a transparent valve, an inlet pressure gauge, an outlet pressure gauge and a thermometer; the water inlet of the transparent valve is connected with an inlet pressure gauge through a pipeline, an exhaust valve and the right port of a first three-way valve are sequentially connected, the left port of the first three-way valve is connected with a filter through a pipeline, a vertical centrifugal pump, a main valve and the lower water outlet of a circulating water tank in sequence, the vertical centrifugal pump is connected with a far-end frequency converter through a line, the upper port of the first three-way valve is connected with a drain tank, the water outlet of the transparent valve is connected with an outlet pressure gauge through a pipeline, the right port of the second three-way valve is connected with an electromagnetic flowmeter through a pipeline, the electromagnetic flowmeter extends into the circulating water tank through a pipeline, the lower port of the second three-way valve is connected with the drain tank through a pipeline, a heat exchanger is arranged in the circulating water tank near the lower outlet, the water outlet of the, regulating valves are arranged at the water inlet at the left end of the circulating water tank, the water outlet of the dyeing agent water tank and the water outlet of the working medium water tank; the pulsating pressure acquisition and light path system comprises a light source, an optical filter, a high-frequency pulsating pressure sensor, a reflecting plane mirror, a high-speed camera, a computer and a data acquisition system; the laser light source is shot at the bottom of the valve by the plane reflector, the high-speed camera is arranged on the front face of the valve, the optical filter is arranged between the high-speed camera and the valve, and the universal data acquisition system and the high-speed camera are connected to the same computer.
Compared with the prior art, the invention has the beneficial effects that:
the method for visually measuring the flow field characteristics is adopted, and meanwhile, the fluorescence filtering technology is adopted, so that the problem of reflection of light on the boundary surface is solved, and the measurement precision of the flow field near the valve boundary is improved; compared with the pulse laser matched with a frame-crossing camera adopted by the traditional visual measurement, the continuous laser matched with the high-speed camera meets the requirement that the continuous measurement of the internal flow field of the valve on the time sequence is uninterrupted, so that the continuous capture of the internal flow field information of the valve on the time sequence can be clearly obtained; the synchronous controller controls the camera and the acquisition system to synchronously trigger, so that the synchronism in the coupling measurement engineering is fully ensured; the invention ingeniously utilizes the plane reflector to design the light path aiming at the structural characteristics of the valve, and simultaneously carries out the adaptive pressure measurement hole opening mode according to the characteristics of the valve, thereby avoiding the influence on flow field shooting and more accurately obtaining the internal pulsating pressure, and providing a new thought of measuring points for the pressure pulsation of the valve; the invention has simple structure, low cost and smart design. The method has wide applicable experimental working condition range, is suitable for the research of the characteristics of the complex flow field inside the valve and the high-frequency pulsating pressure, and can well acquire flow field flowing information and pressure pulsation information.
Drawings
FIG. 1 is a schematic diagram of a visual experimental loop of a visual valve flow field-pressure pulsation coupling measurement system;
FIG. 2 is a schematic diagram of a pulsating pressure acquisition and optical path system of a visual valve flow field-pressure pulsation coupling measurement system;
fig. 3 is a valve pressure tap layout diagram of a visual valve flow field-pressure pulsation coupling measurement system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention provides a visual valve flow field-pressure pulsation coupling measurement experiment system, which comprises a visual circulation loop and a pulsation pressure acquisition and light path system, and is characterized in that: the visual circulation loop comprises a circulation water tank, a working medium water tank, a coloring agent water tank, a heat exchanger, a main valve, an electromagnetic flowmeter, a vertical centrifugal pump, a frequency converter, a filter, a drainage tank, a three-way valve, an exhaust valve, a transparent valve, an inlet pressure gauge, an outlet pressure gauge and a thermometer. The water inlet of the transparent valve is sequentially connected with an inlet pressure gauge, an exhaust valve and a right port of a first three-way valve through pipelines; a left port of the three-way valve is sequentially connected with the filter, the vertical centrifugal pump, the main valve and the lower water outlet of the circulating water tank through pipelines, and the vertical centrifugal pump is connected with the far-end frequency converter through a line; the upper port of the first three-way valve is connected with a drainage tank; the water outlet of the transparent valve is connected with an outlet pressure gauge and a right port of the three-way valve II through a pipeline; the right port of the second three-way valve is connected with an electromagnetic flowmeter through a pipeline; the electromagnetic flowmeter extends into the circulating water tank through a pipeline; the lower port of the second three-way valve is connected with a drainage tank through a pipeline. A heat exchanger is arranged in the circulating water tank near the lower outlet; the water outlet of the working medium water tank is connected with the water outlet of the dyeing agent water tank through a pipeline, and the water inlet at the upper end of the circulating water tank is connected with the working medium water tank and the water outlet of the dyeing agent water tank through a pipeline; regulating valves are arranged at the water inlet at the left end of the circulating water tank, the water outlet of the dyeing agent water tank and the water outlet of the working medium water tank. The pulsating pressure acquisition and light path system comprises a light source, an optical filter, a high-frequency pulsating pressure sensor, a reflecting plane mirror, a high-speed camera, a computer and a data acquisition system; the transparent valve can only be polished from the bottom due to the structural particularity, so that a laser light source is polished at the bottom of the valve by virtue of a plane reflector; the high-speed camera is arranged on the front surface of the valve; the optical filter is arranged between the high-speed camera and the valve; the general data acquisition system and the high-speed camera are connected to the same computer.
Referring to fig. 1, the visual experiment loop system of the invention is composed of a circulating water tank 1, a working medium water tank 2, a coloring agent water tank 3, a regulating valve 4, a heat exchanger 5, a main valve 6, a vertical centrifugal pump 7, a frequency converter 8, a filter 9, a drainage tank 10, a three-way valve 11, an exhaust valve 12, an inlet pressure gauge 13, a transparent valve 14, an outlet pressure gauge 15, an electromagnetic flowmeter 16 and a thermometer 17. Before the experiment begins, the regulating valves 4 of the circulating water tank 1, the working medium water tank 2 and the coloring agent water tank 3 are opened according to a certain valve opening degree, and the obtained coloring agent solution with proper concentration enters the circulating water tank 1. Closing the regulating valve 4, opening the loop main valve 6, starting water filling of the experiment valve 14, slowly starting the vertical centrifugal pump 7 after the water pre-filling stage is completed, completing the final water filling stage, then opening the exhaust valve 12, exhausting the transparent valve 14, closing the exhaust valve 12 and opening each instrument after the exhausting is completed, monitoring whether each parameter is abnormal or not, and completing the loop debugging. In the experiment, under the drive of the vertical centrifugal pump 7, the working medium flows through all the valves and the instruments and returns to the circulating water tank 1 to complete flowing circulation, the temperature of the working medium is kept constant through the heat exchanger 5 in the circulating water tank 1, and related experiment errors caused by the change of physical property parameters of the working medium are avoided.
Referring to fig. 2, the pulsating pressure collection and optical path system of the present invention is composed of a transparent valve 14, a high-frequency pulsating pressure sensor 18, a valve support 19, a planar reflector 20, a 532nm continuous laser generator 21, a 532nm narrow-pass filter 22, a high-speed camera 23, a synchronizer 24, a general data collection system 25 and a computer 26. In the experiment, flow information of a flow field is recorded by the high-speed camera 23, pressure pulsation information is acquired by the universal data acquisition system 25, and in order to ensure the synchronism of the flow field information and the pressure pulsation information, the synchronizer 24 is used for controlling the synchronous triggering of the high-speed camera 23 and the data acquisition system 25, so that the time lag between data acquisition is avoided. Due to the structural particularity of the experimental valve 14, the light is irradiated from the bottom by virtue of the plane reflector 20, the 532nm continuous laser generator 21 is adopted in combination with the high-speed camera 23, the continuity of the time sequence in the flow field measurement process is fully ensured, the time sequence information of the flow field characteristics in the valve can be clearly obtained, and the method has extremely important significance for researching the movement and evolution process of the flow field structure in the valve; by adopting a fluorescence filtering technology, the fluorescent light wave of the staining agent solution is filtered through the narrow-pass filter 22, the problem of particle covering caused by strong reflection at the valve boundary is solved, and the accuracy of flow characteristic measurement of the flow field is fully ensured.
With reference to fig. 3, which is a diagram of an arrangement scheme of valve pressure taps of the present invention, through a pre-experiment and a CFD simulation calculation integrated result, a rough flow field structure characteristic inside the valve is known, flow characteristics at each position of a valve inlet, a valve core, a valve inlet arc and a valve outlet are known, the pressure taps are opened near the corresponding positions, the valve core and the valve outlet flow vigorously, so that more measuring points are arranged at the corresponding positions, but in the actual situation of opening the holes, 2 and 5 pulsating pressure sensors are respectively arranged, the valve arc position has a flow dead zone, 2 pulsating pressure sensors are also arranged at the corresponding positions, the flow at the valve inlet is relatively smooth, but considering a larger inlet range, 3 pulsating pressure sensors are arranged at the positions, which is helpful to obtain more representative pulsating pressure experimental data, and fully utilize the pulsating pressure sensors, the pulsating pressure inside the valve can be known more accurately.
Claims (1)
1. The utility model provides a visual valve flow field-pressure pulsation coupling measurement experimental system, includes visual circulation circuit and pulsating pressure collection and optical path system, its characterized in that: the visual circulation loop comprises a circulation water tank, a working medium water tank, a coloring agent water tank, a heat exchanger, a main valve, an electromagnetic flowmeter, a vertical centrifugal pump, a frequency converter, a filter, a drainage tank, a three-way valve, an exhaust valve, a transparent valve, an inlet pressure gauge, an outlet pressure gauge and a thermometer; the water inlet of the transparent valve is connected with an inlet pressure gauge through a pipeline, an exhaust valve and the right port of a first three-way valve are sequentially connected, the left port of the first three-way valve is connected with a filter through a pipeline, a vertical centrifugal pump, a main valve and the lower water outlet of a circulating water tank in sequence, the vertical centrifugal pump is connected with a far-end frequency converter through a line, the upper port of the first three-way valve is connected with a drain tank, the water outlet of the transparent valve is connected with an outlet pressure gauge through a pipeline, the right port of the second three-way valve is connected with an electromagnetic flowmeter through a pipeline, the electromagnetic flowmeter extends into the circulating water tank through a pipeline, the lower port of the second three-way valve is connected with the drain tank through a pipeline, a heat exchanger is arranged in the circulating water tank near the lower outlet, the water outlet of the, regulating valves are arranged at the water inlet at the left end of the circulating water tank, the water outlet of the dyeing agent water tank and the water outlet of the working medium water tank; the pulsating pressure acquisition and light path system comprises a light source, an optical filter, a high-frequency pulsating pressure sensor, a reflecting plane mirror, a high-speed camera, a computer and a data acquisition system; the laser light source is shot at the bottom of the valve by the plane reflector, the high-speed camera is arranged on the front face of the valve, the optical filter is arranged between the high-speed camera and the valve, and the universal data acquisition system and the high-speed camera are connected to the same computer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011284158.8A CN112504660A (en) | 2020-11-17 | 2020-11-17 | Visual valve flow field-pressure pulsation coupling measurement experiment system |
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| CN202011284158.8A CN112504660A (en) | 2020-11-17 | 2020-11-17 | Visual valve flow field-pressure pulsation coupling measurement experiment system |
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| CN112504660A true CN112504660A (en) | 2021-03-16 |
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Citations (9)
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| JPH0763641A (en) * | 1993-08-26 | 1995-03-10 | Nippon Steel Corp | Method for visualizing liquid field of gas-liquid mixed phase flow field |
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| CN102175423A (en) * | 2011-01-28 | 2011-09-07 | 上海理工大学 | Device and experimental method for visualization research on labyrinth channel in high pressure regulating valve |
| CN103335834A (en) * | 2013-07-02 | 2013-10-02 | 南京工业大学 | Throttle valve port performance test device |
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| CN108757505A (en) * | 2018-07-10 | 2018-11-06 | 哈尔滨工程大学 | A kind of centrifugal pump flow field-pressure fluctuation coupling measurement experimental system |
| CN109115273A (en) * | 2018-09-25 | 2019-01-01 | 哈尔滨工程大学 | A kind of visible velocity field and thermal field coupling measurement experimental system |
| US20200096452A1 (en) * | 2018-09-21 | 2020-03-26 | Dalian University Of Technology | Fully visual flow loop system for studying hydrate blockage |
| CN111608927A (en) * | 2020-05-19 | 2020-09-01 | 中国船舶科学研究中心 | Device and method for synchronous measurement of flow field, pressure field and sound field of centrifugal pump |
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2020
- 2020-11-17 CN CN202011284158.8A patent/CN112504660A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0763641A (en) * | 1993-08-26 | 1995-03-10 | Nippon Steel Corp | Method for visualizing liquid field of gas-liquid mixed phase flow field |
| WO2006076252A2 (en) * | 2005-01-10 | 2006-07-20 | Semih Olcmen | Spark-plug ldv, lif, and lii probe for engine flow and combustion analysis |
| CN102175423A (en) * | 2011-01-28 | 2011-09-07 | 上海理工大学 | Device and experimental method for visualization research on labyrinth channel in high pressure regulating valve |
| CN103335834A (en) * | 2013-07-02 | 2013-10-02 | 南京工业大学 | Throttle valve port performance test device |
| CN105004507A (en) * | 2015-07-02 | 2015-10-28 | 哈尔滨工程大学 | Rod cluster channel flow visualization experiment system |
| CN108757505A (en) * | 2018-07-10 | 2018-11-06 | 哈尔滨工程大学 | A kind of centrifugal pump flow field-pressure fluctuation coupling measurement experimental system |
| US20200096452A1 (en) * | 2018-09-21 | 2020-03-26 | Dalian University Of Technology | Fully visual flow loop system for studying hydrate blockage |
| CN109115273A (en) * | 2018-09-25 | 2019-01-01 | 哈尔滨工程大学 | A kind of visible velocity field and thermal field coupling measurement experimental system |
| CN111608927A (en) * | 2020-05-19 | 2020-09-01 | 中国船舶科学研究中心 | Device and method for synchronous measurement of flow field, pressure field and sound field of centrifugal pump |
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Application publication date: 20210316 |