CN109115273B - Visual flow field and temperature field coupling measurement experiment system - Google Patents
Visual flow field and temperature field coupling measurement experiment system Download PDFInfo
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- CN109115273B CN109115273B CN201811115096.0A CN201811115096A CN109115273B CN 109115273 B CN109115273 B CN 109115273B CN 201811115096 A CN201811115096 A CN 201811115096A CN 109115273 B CN109115273 B CN 109115273B
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- 238000002474 experimental method Methods 0.000 title claims abstract description 45
- 238000005259 measurement Methods 0.000 title claims abstract description 35
- 230000008878 coupling Effects 0.000 title claims abstract description 21
- 238000010168 coupling process Methods 0.000 title claims abstract description 21
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 21
- 230000000007 visual effect Effects 0.000 title claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 100
- 239000003086 colorant Substances 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 9
- 239000000498 cooling water Substances 0.000 claims description 9
- 239000007850 fluorescent dye Substances 0.000 claims description 9
- 239000000700 radioactive tracer Substances 0.000 claims description 7
- 230000002572 peristaltic effect Effects 0.000 claims description 4
- 239000000975 dye Substances 0.000 claims description 3
- 238000000917 particle-image velocimetry Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 9
- 230000001360 synchronised effect Effects 0.000 abstract description 9
- 238000013461 design Methods 0.000 abstract description 6
- 238000001499 laser induced fluorescence spectroscopy Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 5
- 238000012545 processing Methods 0.000 abstract description 5
- 230000000704 physical effect Effects 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 5
- 230000000295 complement effect Effects 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- General Physics & Mathematics (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention provides a visual flow field and temperature field coupling measurement experiment system. The invention can realize the visual measurement of the internal flow field and temperature field characteristics of the complex mechanical structure under different experimental conditions. According to the invention, a reasonable light path system is constructed by combining a Laser Induced Fluorescence (LIF) technology and a Particle Image Velocimetry (PIV), a series of optical elements such as a spectroscope and a narrow-pass filter are used for carrying out wave division processing on light wave signals, and a synchronizer is used for controlling a high-speed camera to synchronously shoot so as to realize synchronous acquisition of temperature distribution and flow characteristic parameters of a complex flow field in a visual experiment body. The invention adopts the modularized loop design, each sub-loop is mutually independent, and the reliability of an experimental system is higher. The invention can develop full-field real-time synchronous measurement for physical property parameters in the complex flow field, can not disturb the actual flow field in the measurement process, and is suitable for researching flow characteristics of various complex flow fields.
Description
Technical Field
The invention belongs to the field of hydrodynamic experiments, and particularly relates to a visual flow field and temperature field coupling measurement experiment system.
Background
With the increasing demand for energy, the development and application of nuclear energy are increasingly emphasized. In a nuclear power system, a nuclear main pump is used as a core component of the whole system and is responsible for driving a loop coolant to circulate and guide out core heat, and the running performance of the nuclear main pump directly determines the safety and the economy of the whole nuclear power system. Therefore, the optimization of the nuclear main pump has important significance, however, the operation performance of the main pump depends on the flow condition of the working medium in the main pump to a great extent, so that the accurate measurement of the internal flow field characteristics of the main pump has great significance for improving the operation efficiency, the service life and the operation safety of the pump and improving the economy of a nuclear power system. As mechanical equipment with a complex structure, the fluid flowing process in the main pump is very complex, is a complex compound motion and has the characteristic of high-frequency pulsation. Accurate acquisition of the internal flow field information is difficult. The traditional measuring means generally arranges sensing elements (directional probes, pressure sensing elements and the like) in the flow field to collect corresponding flow field information, but the measuring method has the defects of measurement delay, difficult arrangement of the sensing elements, difficult realization of full-field measurement and the like, and can also interfere flow of the flow field in the measuring process, thereby seriously affecting the accuracy of experimental measurement. Besides the traditional experimental means, the numerical calculation is also a widely applied analysis means, has the advantages of convenience, rapidness, low cost and the like, but the result needs to be verified by accurate experimental data, so that an experimental measurement system is necessary to be designed, the defect of accuracy of a numerical simulation result is overcome, and the current situation that the traditional measurement method disturbs a flow field is avoided.
Disclosure of Invention
The invention provides a visual flow field and temperature field coupling measurement experimental system which can be used in a complex flow field to realize coupling synchronous measurement of multiple physical parameters in the flow field.
The aim of the invention is realized by the following technical scheme:
the visual flow field and temperature field coupling measurement experiment system comprises a loop system and an optical path system, wherein the loop system comprises a temperature calibration loop and a circulation loop, the circulation loop comprises a circulation water tank and a colorant water tank, trace particles are added in the circulation water tank, fluorescent colorant is added in the colorant water tank, a water outlet at the bottom of the circulation water tank is sequentially connected with a main valve, a circulation pump and a main valve through pipelines, a flowmeter is connected with a water inlet of an experiment body, a water outlet of the experiment body extends into the circulation water tank through pipelines, thermometers are arranged on the water inlet and the water outlet of the experiment body, and the water outlet of the colorant water tank is sequentially connected with a peristaltic pump and the water inlet of the experiment body through pipelines; the temperature calibration loop comprises a calibration water tank, wherein fluorescent dye is added in the calibration water tank, a water outlet of the calibration water tank is connected between a main valve and a circulating pump of the circulation loop through a pipeline and a check valve, a water inlet of the calibration water tank is connected with a water outlet of a calibration body through a pipeline, a water inlet of the calibration body is connected between the circulating pump and a main valve of the circulation loop through a pipeline and a check valve, and thermometers are arranged on a water inlet and a water outlet pipeline of the calibration body; the optical path system comprises a high-speed camera, a velocimeter and a laser generator; the laser generators are arranged at two sides of the experiment body; the velocimeter is connected with the experiment body; the high-speed camera is arranged outside the experiment body and connected with the synchronizer, and the spectroscope and the optical filter are arranged between the high-speed camera and the experiment body.
The invention may further include:
the fluorescent coloring agent added in the calibration water tank is FL27; the tracer particles added in the circulating water tank are PIV tracer particles; the fluorescent dye added in the dye water tank is RhB; the optical path system is provided with 3 high-speed cameras, wherein one high-speed camera is provided with a 527nm narrow-pass filter, one high-speed camera is provided with a 532nm narrow-pass filter, and one high-speed camera is provided with a 578nm narrow-pass filter.
The loop system comprises a cooling loop and a bypass loop, the cooling loop comprises a cooling water tank, a circulating pump and a heat exchanger, the heat exchanger is respectively arranged in the circulating water tank and the calibration water tank, and a water outlet of the cooling water tank is sequentially connected with a water inlet of the circulating pump, the heat exchanger and the cooling water tank through pipelines; a heater is arranged in the circulating water tank; the bypass loop comprises a bypass valve, one end of the bypass valve is connected to the circulating water tank through a pipeline, and the other end of the bypass valve is connected between the main valve and the circulating pump of the circulating loop through a pipeline.
The invention has the beneficial effects that:
1. the invention combines Particle Image Velocimetry (PIV) technology and Laser Induced Fluorescence (LIF) technology to respectively capture the temperature distribution, the speed distribution, the movement track and the movement process of the flowing working medium of the flow field in real time under the condition of not interfering the flow field.
2. The invention adopts a visual measurement method, does not need to arrange a corresponding sensor in the flow field, can not disturb the flow field in the measurement process, and can simultaneously realize the coupling measurement of temperature field-flow field multiparameter physical quantity;
3. the experimental loop adopts a modularized design, and the sub-loops are mutually independent and do not interfere with each other, so that the reliability and the accuracy of a coupling measurement experimental system are improved, and the experimental requirements of temperature calibration, working medium cooling and coupling measurement are met;
4. according to the invention, the double lasers are adopted for complementary polishing, so that the light intensity requirement in the experiment is ensured, meanwhile, the defect of uneven light intensity caused by the loss along the path is overcome, and the experimental measurement precision is effectively ensured;
5. the invention adopts the optical element to carry out the wave division processing of the light wave, and utilizes the synchronizer to control the synchronous triggering of a plurality of cameras, thereby realizing the synchronous acquisition of multi-parameter information in the flow field;
6. the system of the invention has simple and ingenious design, low price, easy processing and wide application range, and can provide guidance for researching the flow characteristics of the flow field in the pump and improving the structural design of the pump.
Drawings
FIG. 1 is a schematic diagram of a loop system of a visual flow field and temperature field coupling measurement experiment system.
Fig. 2 is a schematic diagram of an optical path system of a visual flow field and temperature field coupling measurement experiment system.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The visual flow field and temperature field coupling measurement experiment system comprises a loop system and an optical path system, and is a loop system of the invention in combination with FIG. 1;
the loop system comprises a temperature calibration loop and a circulation loop, the circulation loop comprises a circulation water tank 1 and a colorant water tank 13, trace particles are added in the circulation water tank, fluorescent colorant is added in the colorant water tank, a water outlet at the bottom of the circulation water tank is sequentially connected with a main valve 4, a circulation pump 5 and a main valve 8 through pipelines, a flowmeter 9 is connected with a water inlet of an experiment body 12, a water outlet of the experiment body extends into the circulation water tank through pipelines, a thermometer 10 is arranged on the water inlet and the water outlet of the experiment body, and a water outlet of the colorant water tank is sequentially connected with a peristaltic pump 11 and the water inlet of the experiment body through pipelines; the temperature calibration loop comprises a calibration water tank 14, a fluorescent coloring agent is added in the calibration water tank, a water outlet of the calibration water tank is connected between a main valve 4 and a circulating pump 5 of the circulating loop through a pipeline and a check valve 6, a water inlet of the calibration water tank is connected with a water outlet of a calibration body 15 through a pipeline, a water inlet of the calibration body is connected between the circulating pump 5 and a main valve 8 of the circulating loop through a pipeline and the check valve 6, and thermometers are arranged on a water inlet and a water outlet of the calibration body;
the loop system also comprises a cooling loop and a bypass loop, the cooling loop comprises a cooling water tank 16, a circulating pump 5 and a heat exchanger 2, the heat exchanger is respectively arranged in the circulating water tank 1 and the calibration water tank 14, and a water outlet of the cooling water tank is sequentially connected with a water inlet of the circulating pump, the heat exchanger and the cooling water tank through pipelines; a heater 3 is arranged in the circulating water tank 1; the bypass loop comprises a bypass valve 7, one end of the bypass valve is connected to the circulating water tank through a pipeline, and the other end of the bypass valve is connected between a main valve 8 of the circulating loop and the circulating pump 5 through a pipeline.
With reference to fig. 2, an optical path system of the present invention is shown; the optical path system comprises a high-speed camera 21, a velocimeter 17 and a laser generator 18; the laser generators are arranged at two sides of the experiment body; the velocimeter is connected with the experiment body 12; the high-speed camera is arranged outside the experimental body and is connected with a synchronizer 24, and the synchronizer is controlled by a computer 25. A spectroscope 19 and an optical filter are arranged between the high-speed camera and the experiment body.
The fluorescent coloring agent added in the calibration water tank is FL27; the tracer particles added in the circulating water tank are PIV tracer particles; the fluorescent dye added in the dye water tank is RhB; the optical path system is provided with 3 high-speed cameras, wherein one high-speed camera is provided with a 527nm narrow-pass filter 20, one high-speed camera is provided with a 532nm narrow-pass filter 22, and one high-speed camera is provided with a 578nm narrow-pass filter 23.
Before the experiment starts, PIV tracer particles are uniformly dispersed in a circulating water tank, fluorescent dye FL27 for temperature measurement is dissolved in a circulating working medium in a certain concentration, and then temperature calibration is carried out on the fluorescent dye FL 27. The circulation loop of the experiment system is closed, the temperature calibration loop is opened (the main valve 4, the bypass valve 7 and the main valve 8 are closed, the check valve 6 is opened), and the fluorescent dye temperature-light intensity curve in the experiment temperature range is calibrated. After the calibration is completed, the calibration circuit is closed, and the bypass circuit (the main valve 4, the bypass valve 7, the check valve 6 and the main valve 8) is opened to stabilize the flow rate of the pipeline and to exhaust the air in the pipeline. And then, opening a circulation loop and a cooling loop (closing a check valve 6, a bypass valve 7, opening a main valve 4 and a main valve 8), regulating the flow of the loop by regulating the opening of the main valve 4 and the main valve 8, enabling working media in the loop to circularly flow under the driving of a circulation pump 5, injecting fluorescent dye RhB into an experiment body through a peristaltic pump 11 after the working condition of the loop is stable, representing the movement process of the flowing working media by the diffusion of the fluorescent dye RhB, and measuring the flow field characteristic parameters in a flow field by adopting a high-speed camera.
The two laser generators 18 with the same type are used for complementary polishing, so that the laser intensity requirement in experiments is ensured, experimental errors caused by light intensity weakness due to multiple light splitting are prevented, meanwhile, the defect of uneven light intensity caused by the loss along the path is overcome, and the experimental measurement accuracy is effectively ensured. The spectroscopic 19 is utilized to split the optical wave signals twice, meanwhile, the narrow-pass filters 20, 22 and 23 are utilized to carry out the wave splitting treatment (527 nm of the narrow-pass filter 20 only holds the fluorescent signal of the colorant FL27, 532nm of the narrow-pass filter 22 holds the astigmatic signal of the trace PIV particles, 578nm of the narrow-pass filter 23 only holds the fluorescent signal of the colorant RhB), the synchronizer 24 is utilized to control the synchronous shooting of the high-speed camera 21, and the temperature distribution, the speed distribution, the movement track and the movement process of the flowing working medium of the flow field are respectively captured, so that the coupling synchronous measurement of multiple physical parameters in the flow field is realized.
The invention aims to provide a visual flow field and temperature field coupling measurement experiment system which is ingenious in design, low in cost, accurate and convenient in data acquisition, wide in research working condition range and suitable for researching flow characteristics of various complex flow fields. Visual measurement of the internal flow field and temperature field characteristics of the complex mechanical structure under different experimental conditions can be realized, and two advanced laser diagnosis technologies are combined: and (3) constructing a reasonable light path system by using a Laser Induced Fluorescence (LIF) technology and a Particle Image Velocimetry (PIV), carrying out wave division processing on PIV trace particles and light waves of fluorescent colorants RhB and FL27 by using a series of optical elements such as spectroscopes, narrow-pass filters and the like, synchronously shooting by using a synchronizer control high-speed camera, and obtaining the distribution characteristics of a flow field and a temperature field under different experimental working conditions after image processing. The distribution characteristics of the flow field and the temperature field comprise: temperature distribution, speed distribution, turbulence intensity distribution, movement track and movement process of flowing working medium of the flow field. The invention realizes the coupling synchronous measurement of multiple physical parameters in the flow field.
The experimental loop adopts a modularized design scheme to ensure the reliability and the accuracy of a coupling measurement experimental system, and meets the experimental requirements of temperature calibration, working medium cooling and coupling measurement;
according to the invention, the double lasers are adopted for complementary polishing, so that the light intensity requirement in the experiment is ensured, experimental errors caused by light intensity weakness due to multiple times of light splitting are prevented, meanwhile, the defect of uneven light intensity caused by the loss along the path is overcome, and the experimental measurement precision is effectively ensured;
the invention adopts the high-precision level to adjust the experiment bench and the high-speed camera, ensures the verticality between the high-speed camera and the shooting surface, and prevents measurement errors caused by optical path distortion;
the high-speed camera and the laser generator are arranged on the high-precision horizontal sliding rail, so that the measuring position of the laser surface can be adjusted according to experimental requirements, and further, the flow field characteristics of different areas can be obtained;
the invention adopts a series of optical elements such as a semi-transparent semi-reflective spectroscope, a cut-off filter, a narrow-pass filter and the like to separate light wave signals with different wavelengths, so as to realize synchronous acquisition of information such as temperature, speed, working medium movement process (trace) and the like in a flow field;
according to the invention, the shooting of three cameras is controlled by the synchronizer, so that the shooting synchronism of the cameras is fully ensured, and the experimental error caused by shooting delay among the cameras is greatly reduced.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The utility model provides a visual flow field and temperature field coupling measurement experiment system, includes loop system and optical path system, its characterized in that: the loop system comprises a temperature calibration loop and a circulation loop, the circulation loop comprises a circulation water tank and a colorant water tank, trace particles are added in the circulation water tank, fluorescent colorant is added in the colorant water tank, a water outlet at the bottom of the circulation water tank is sequentially connected with a main valve, a circulation pump and a main valve through pipelines, a flowmeter is connected with a water inlet of an experiment body, a water outlet of the experiment body stretches into the circulation water tank through pipelines, thermometers are arranged on the water inlet and the water outlet pipeline of the experiment body, and the water outlet of the colorant water tank is sequentially connected with a peristaltic pump and the water inlet of the experiment body through pipelines; the temperature calibration loop comprises a calibration water tank, wherein fluorescent coloring agent is added in the calibration water tank, a water outlet of the calibration water tank is connected between a main valve and a circulating pump of the circulation loop through a pipeline and a check valve, a water inlet of the calibration water tank is connected with a water outlet of a calibration body through a pipeline, a water inlet of the calibration body is connected between the circulating pump and a main valve of the circulation loop through a pipeline and a check valve, and thermometers are arranged on a water inlet and a water outlet pipeline of the calibration body; the optical path system comprises a high-speed camera, a velocimeter and a laser generator; the laser generators are arranged at two sides of the experiment body; the velocimeter is connected with the experiment body; the high-speed camera is arranged outside the experiment body and connected with the synchronizer, and the spectroscope and the optical filter are arranged between the high-speed camera and the experiment body.
2. The visual flow field and temperature field coupling measurement experiment system according to claim 1, wherein: the fluorescent coloring agent added in the calibration water tank is FL27; the tracer particles added in the circulating water tank are PIV tracer particles; the fluorescent dye added in the dye water tank is RhB; the optical path system is provided with 3 high-speed cameras, wherein one high-speed camera is provided with a 527nm narrow-pass filter, one high-speed camera is provided with a 532nm narrow-pass filter, and one high-speed camera is provided with a 578nm narrow-pass filter.
3. The visual flow field and temperature field coupling measurement experiment system according to claim 1 or 2, wherein: the loop system comprises a cooling loop and a bypass loop, the cooling loop comprises a cooling water tank, a circulating pump and a heat exchanger, the heat exchanger is respectively arranged in the circulating water tank and the calibration water tank, and a water outlet of the cooling water tank is sequentially connected with a water inlet of the circulating pump, the heat exchanger and the cooling water tank through pipelines; a heater is arranged in the circulating water tank; the bypass loop comprises a bypass valve, one end of the bypass valve is connected to the circulating water tank through a pipeline, and the other end of the bypass valve is connected between the main valve and the circulating pump of the circulating loop through a pipeline.
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| CN114719912B (en) * | 2022-04-26 | 2022-11-25 | 中国科学院大学 | Experimental system and measuring method for simultaneous measurement of multiple physical fields |
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