CN111307404A - Device and method for testing internal flow field of jet fan - Google Patents
Device and method for testing internal flow field of jet fan Download PDFInfo
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- CN111307404A CN111307404A CN202010151993.8A CN202010151993A CN111307404A CN 111307404 A CN111307404 A CN 111307404A CN 202010151993 A CN202010151993 A CN 202010151993A CN 111307404 A CN111307404 A CN 111307404A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/065—Measuring arrangements specially adapted for aerodynamic testing dealing with flow
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/08—Aerodynamic models
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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
- G01M99/00—Subject matter not provided for in other groups of this subclass
- G01M99/008—Subject matter not provided for in other groups of this subclass by doing functionality tests
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Abstract
The invention discloses a device for testing an internal flow field of a jet fan, which comprises a gas supply system, a gas vortex flowmeter, a pressure transmitter, a temperature sensor, a digital display, a data processing system, a particle generator, a laser and a camera, wherein the gas supply system is connected with the gas vortex flowmeter; the air supply system provides a pressure environment for the internal flow field of the jet flow fan; the gas vortex flowmeter, the pressure transmitter and the temperature sensor are respectively arranged between the output end of the gas supply system and the input end of the jet fan; the digital display instrument is arranged between the output end of the air supply system and the input end of the jet flow fan; the data processing system is connected with the sensor; the particle generator emits trace particles into the jet fan; the laser emits a sheet light source into the jet fan; the camera tracks the flow trajectory of the tracer particles. The invention also discloses a method for testing the internal flow field of the jet fan. The invention improves the accuracy of measuring the internal flow field characteristics of the jet flow fan.
Description
Technical Field
The invention relates to the technical field of tunnel ventilation equipment, in particular to a device and a method for testing an internal flow field of a jet fan.
Background
The jet fan is mainly used for urban highway tunnels and underground tunnels, and has the functions of making up the defects of natural ventilation and cross ventilation, further ensuring normal ventilation and air exchange in the tunnel, discharging pollutants in the tunnel, and performing ventilation cooling, fire control and smoke exhaust and the like when a fire disaster occurs in the tunnel.
Along with the continuous expansion of the tunnel scale, the ventilation energy consumption is continuously increased, and the tunnel operation cost is increased. In order to reduce the energy consumption of tunnel ventilation, an authorized notice number CN205805881U discloses a tunnel long-distance variable frequency ventilation system, which comprises a frequency converter for suppressing higher harmonics and clutter, wherein the front end of the frequency converter is connected with a jet fan for ventilation, and an authorized notice number CN206723081U discloses a pneumatic tunnel jet fan.
However, the method for measuring the speed of the jet fan in the prior art still stays at the stage of using a pitot tube, such as the certification device disclosed by the authorized publication number CN209640374U for a pitot tube current meter, or using an anemometer and other instruments, such as the device and the method for measuring the flow of the axial fan based on the principle of hot wire wind speed sensing disclosed by the publication number CN108469283A for the axial fan, and cannot accurately describe the characteristics of the internal flow field of the jet fan. The existing experimental method (a pitot tube and a hot wire anemometer) is difficult to accurately test the internal flow field of the jet fan, and the flow track of gas cannot be effectively described.
In view of this, in order to improve the accuracy of measuring the characteristics of the tunnel jet fan, the invention provides a device and a method for testing an internal flow field of the jet fan.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above. Therefore, the invention aims to provide a device and a method for testing the internal flow field of a jet flow fan so as to improve the accuracy of measurement of the internal flow field characteristics of the jet flow fan.
In order to achieve the above object, a first embodiment of the present invention provides a device for testing an internal flow field of a jet fan, which includes an air supply system, a gas vortex flowmeter, a pressure transmitter, a temperature sensor, a digital display, a data processing system, a particle generator, a laser, and a camera;
the air supply system provides a pressure environment for the internal flow field of the jet flow fan;
the gas vortex flow meter, the pressure transmitter and the temperature sensor are respectively arranged between the output end of the gas supply system and the input end of the jet flow fan and correspondingly measure the volume flow of the gas, the starting pressure of the jet flow fan and the initial temperature of the gas;
the digital display is arranged between the output end of the gas supply system and the input end of the jet flow fan, receives the gas volume flow measured by the gas vortex flow meter, the starting pressure of the jet flow fan measured by the pressure transmitter and the initial temperature of the gas measured by the temperature sensor, and is connected with the sensor;
the data processing system is connected with the sensor and used for receiving the gas volume flow, the starting pressure and the gas initial temperature data transmitted by the sensor; a first pulse counter is arranged between the data processing system and the sensor, records the starting pressure of the jet fan, the volume flow of the gas and the vector displacement of the initial temperature, and transmits the vector displacement to the data processing system;
the particle generator emits trace particles into the jet fan; the two particle generators are used for emitting corresponding trace particles into the jet fan according to two different-density gases conveyed by the gas supply system;
the laser emits a sheet light source into the jet fan;
the camera tracks the flow track of the tracer particles, the vector displacement of the tracer particles is recorded through the second pulse counter, the second pulse counter transmits data to the data processing system, and the data processing system performs image processing and numerical calculation processing according to the starting pressure of the jet fan, the volume flow of gas, the vector displacement of initial temperature and the vector displacement of the tracer particles, so that the performance test of the jet fan is realized.
According to the internal flow field testing device of the jet fan, disclosed by the embodiment of the invention, a gas vortex flow meter, a pressure transmitter and a temperature sensor are used for correspondingly measuring the volume flow of gas, the starting pressure of the jet fan and the initial temperature of the gas, and a first pulse counter is used for recording the vector displacement of the starting pressure of the jet fan, the volume flow of the gas and the initial temperature and transmitting the vector displacement to a data processing system; meanwhile, the second pulse counter records the vector displacement of the tracer particles and transmits data to the data processing system; the data processing system carries out image processing and numerical calculation processing according to the starting pressure of the jet flow fan, the volume flow of the gas, the vector displacement of the initial temperature and the vector displacement of the tracer particles, so that the performance test of the jet flow fan is realized, and the accuracy of measuring the flow field characteristics in the jet flow fan is improved.
In addition, the internal flow field testing device for the jet flow fan, which is provided by the embodiment of the invention, can also have the following additional technical characteristics:
furthermore, two lasers are arranged, the two lasers emit light sources from different angles to the middle and scan the whole two-dimensional plane where the tracer particles flow in the jet fan.
Furthermore, each laser emitting sheet light source respectively passes through the prism and then sweeps the whole two-dimensional plane where the tracer particles in the jet fan flow.
Furthermore, the outer wall of the jet fan is made of resin glass.
Further, the camera is provided with a filter.
Further, the air supply system comprises an air compressor, a high-pressure air storage tank, a shutoff valve, a pressure gauge, a buffer air tank and a dryer which are sequentially connected in series, the dryer is connected with the gas vortex flowmeter, the high-pressure air storage tank and the buffer air tank are respectively connected with a safety valve, and a connecting pipeline between the pressure gauge and the buffer air tank is connected with a pressure relief valve in parallel.
Further, the pressure of the gas delivered by the gas supply system is 0-0.7 MPa.
In order to achieve the above object, a second embodiment of the present invention provides a method for testing an internal flow field of a jet fan, including the following steps:
firstly, checking the air tightness of a testing device and carrying out safety performance testing;
operating the air supply system to provide a pressure environment for the internal flow field of the jet flow fan;
thirdly, starting the jet flow fan, adjusting the gas supply system to ensure the normal start of the jet flow fan, recording the start pressure in real time by the pressure transmitter, recording the initial temperature in real time by the temperature sensor, recording the volume flow of the gas by the gas vortex flowmeter in real time, and ensuring the normal use of the jet flow fan;
fourthly, starting a digital display instrument, and transmitting the starting pressure, the initial temperature and the gas volume flow data to a data processing system through a sensor;
fifthly, starting the two particle generators, and inputting corresponding tracer particles to the jet fan according to two gases with different densities conveyed by the gas supply system;
sixthly, starting the two lasers, and debugging the angle of the prism so that a sheet light source emitted by the lasers can scan the whole two-dimensional plane of the area to be measured of the jet fan;
starting a camera with a filter, and recording the flow track of the tracer particles in real time;
starting a first pulse counter to record the starting pressure of the jet flow fan, the volume flow of the gas and the vector displacement of the initial temperature, simultaneously starting a second pulse counter to record the vector displacement of the tracer particles, and conveying the tracer particles to a data processing system;
and ninthly, the data processing system performs image processing and numerical calculation processing according to the starting pressure of the jet fan, the volume flow of the gas, the vector displacement of the initial temperature and the vector displacement of the tracer particles, so as to realize the performance test of the jet fan.
According to the internal flow field testing method of the jet fan, the first pulse counter records the starting pressure of the jet fan, the volume flow of gas and the vector displacement of initial temperature and transmits the vector displacement to the data processing system; meanwhile, the second pulse counter records the vector displacement of the tracer particles and transmits data to the data processing system; the data processing system carries out image processing and numerical calculation processing according to the starting pressure of the jet flow fan, the volume flow of the gas, the vector displacement of the initial temperature and the vector displacement of the tracer particles, so that the performance test of the jet flow fan is realized, and the accuracy of measuring the flow field characteristics in the jet flow fan is improved.
Drawings
Fig. 1 is a schematic structural diagram of a device for testing an internal flow field of a jet fan according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a jet fan according to an embodiment of the present invention;
FIG. 3 is a block diagram of a data processing system according to an embodiment of the present invention.
Description of the reference symbols
Air supply system 1 air compressor 11
Converter 61 particle generator 7
The duct 60 is a prism 70.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 to 3, the internal flow field testing device of the jet fan according to the embodiment of the present invention includes a gas supply system 1, a gas vortex flowmeter 2, a pressure transmitter 3, a temperature sensor 4, a digital display 5, a data processing system 6, a particle generator 7, a laser 8, and a camera 9; the gas supply system 1 provides a pressure environment for the flow field inside the jet fan 10, for example, the gas supply system 1 can provide a continuous and stable high-pressure environment for the jet fan 10 to ensure the normal start of the jet fan 10 and cause a low-pressure or even negative-pressure region to be formed near the central axis, thereby inducing a large amount of ambient gas to enter the jet fan 10.
The gas vortex flowmeter 2, the pressure transmitter 3 and the temperature sensor 4 are respectively arranged between the output end of the gas supply system 1 and the input end of the jet flow fan 10 and correspondingly measure the volume flow of the gas, the starting pressure of the jet flow fan 10 and the initial temperature of the gas; the digital display instrument 5 is arranged between the output end of the gas supply system 1 and the input end of the jet fan 10, receives the gas volume flow measured by the gas vortex flow meter 2, the starting pressure of the jet fan 10 measured by the pressure transmitter 3 and the initial temperature of the gas measured by the temperature sensor 4, and is connected with the sensor 20. The temperature sensor 4 may be a digital temperature sensor.
The data processing system 6 is connected with the sensor 20 and receives the gas volume flow, the starting pressure and the gas initial temperature data transmitted by the sensor 20, wherein the data processing system 6 can be connected with a converter 61 to facilitate the data to be led into the data processing system 6; a first pulse counter 30 is arranged between the data processing system 6 and the sensor 20, records the starting pressure of the jet fan 10, the volume flow of the gas and the vector displacement of the initial temperature, and transmits the vector displacement to the data processing system 6; the particle generator 7 emits trace particles 40 into the jet fan 10; the two particle generators 7 are arranged, the two particle generators 7 emit corresponding trace particles 40 into the jet fan 10 according to two different density gases conveyed by the gas supply system 1, wherein the particle generators 7 can be pressurized atomized particle generators 7; the laser 8 emits a sheet light source into the jet fan 10.
The camera 9 tracks the flow track of the tracer particles 40, the camera 9 can be a high-definition camera 9 and records the vector displacement of the tracer particles 40 through a second pulse counter 50, the second pulse counter 50 transmits data to the data processing system 6, and the data processing system 6 performs image processing and numerical calculation processing according to the starting pressure of the jet fan 10, the volume flow of gas, the vector displacement of initial temperature and the vector displacement of the tracer particles 40, so that the performance test of the jet fan 10 is realized.
The image processing program of the data processing system 6 is used for reading the flow trajectory of the tracer particles 40 shot by the high-definition camera 9, and further acquiring parameters such as vector displacement, average speed, volume flow and the like of the two fluids. Meanwhile, the performance of the jet fan 10 is calculated in real time through the volume flow of the mainstream gas obtained by the test system. The specific calculation method is as follows:
wherein L isΔtThe position of the trace particle 40 at time Δ t, L the initial position of the trace particle 40, UxFor tracking the component velocity, U, of the particle 40 in the x-directionyTo trace the component velocity of the particle 40 in the y-direction, V is the volume flow of the high pressure gas, G1Is the mass flow of the high-pressure gas, G2Mass flow of gas at low pressure, GGeneral assemblyε characterizes the performance of the jet fan 10 as the total mass flow of the two fluids.
The gas vortex flow meter 2, the pressure transmitter 3 and the temperature sensor 4 correspondingly measure the volume flow of gas, the starting pressure of the jet flow fan 10 and the initial temperature of the gas, and the first pulse counter 30 records the vector displacement of the starting pressure of the jet flow fan 10, the volume flow of the gas and the initial temperature and transmits the vector displacement to the data processing system 6; at the same time, the second pulse counter 50 records the vector displacement of the trace particles 40 and transmits the data to the data processing system 6; the data processing system 6 performs image processing and numerical calculation processing according to the starting pressure of the jet fan 10, the volume flow of the gas, the vector displacement of the initial temperature, and the vector displacement of the trace particles 40, so as to realize the performance test of the jet fan 10, thereby improving the accuracy of the measurement of the flow field characteristics inside the jet fan 10. The method effectively tests the starting pressure, the initial temperature, the vector displacement of the trace particles 40, the pulse time and the volume flow parameters of the high-pressure gas of the jet fan 10 through a test system; the flow field characteristics inside the jet fan 10 are accurately processed by the data processing system 6.
The measurable speed range of the invention is 0-1000 m/s, and the tracer particles 40 can be used for simulating the flowing rule of the gas, so that the flowing visualization of the gas under the pressure interference condition is realized, and meanwhile, the parameters of the starting pressure, the high-pressure airflow wind speed, the initial temperature, the volume flow and the ejection airflow wind speed under various main-flow high-pressure gas conditions can be obtained. The invention can carry out quantitative test and analysis on the whole process of flowing, mixing and diffusing two gases with different densities under the experimental conditions of different high-pressure gas starting pressures of 0-0.7MPa, different gas components and the like.
When the jet flow fan 10 is started, high-pressure gas enters an area to be measured of the jet flow fan 10 through the pipeline 60, wherein the pipeline 60 can be a high-temperature-resistant pipeline, and the local speed reaches a supersonic speed state. The invention provides a method for testing the whole physical process of flowing, mixing and diffusing of two gases in a jet flow fan 10 under the environmental conditions of different starting pressures (0-0.7MPa), gases with different densities and different initial temperatures, and the method is used for testing parameters such as starting pressures, initial temperatures, volume flow of mainstream high-pressure gas, vector displacement of trace particles 40, pulse time and the like in the gas flowing process under different conditions, so that the visualization of the internal flow field characteristics of the supersonic jet flow fan 10 is realized.
In some examples, the lasers 8 are arranged in two, and the two lasers 8 respectively emit light sheets from different angles into which the light sheets are incident, and sweep the entire two-dimensional plane of the tracer particle 40 flow within the jet fan 10. Each laser 8 emits a sheet of light that passes through the prism 70 and sweeps across the entire two-dimensional plane of flow of the tracer particles 40 in the jet fan 10.
In some examples, the outer wall of the jet fan 10 is made of plexiglas. The camera 9 is provided with a filter 91.
In some examples, the gas pressure delivered by the gas supply system 1 may be 0-0.7 MPa. The gas supply system 1 comprises an air compressor 11, a high-pressure gas storage tank 12, a shutoff valve 13, a pressure gauge 14, a buffer gas tank 15 and a dryer 16 which are sequentially connected in series, wherein the dryer 16 is connected with the gas vortex flowmeter 2, the high-pressure gas storage tank 12 and the buffer gas tank 15 are respectively connected with a safety valve 17, and a connecting pipeline between the pressure gauge 14 and the buffer gas tank 15 is connected with a pressure relief valve 18 in parallel. Wherein, air compressor 11 effectively compresses gas to high-pressure state, stores high-pressure gas through high-pressure gas holder 12, opens through relief valve 17, prevents through stop valve 13 that excessive high-pressure gas from gushing into the region of awaiting measuring suddenly, and manometer 14 records the pressure in the gas supply line in real time, and relief valve 18 discharges excessive high-pressure gas, and buffer gas jar 15 obtains certain buffering with high-pressure gas, and the moisture that desicator 16 made high-pressure gas have absorbs to realize stable continuous high-pressure environment.
The high-pressure gas collection tank 12, the shutoff valve 13, the pressure gauge 14, the buffer gas tank 15, the dryer 16, the safety valve 17 and the pressure relief valve 18 are utilized to effectively control the starting pressure of the jet fan 10, and the volume flow of the trace particles 40 is effectively controlled by matching with the pressurized atomizing type particle generator 7.
As shown in fig. 1 to 3, the invention further provides a method for testing the internal flow field of the jet fan, which comprises the following steps:
firstly, checking the air tightness of the testing device and carrying out safety performance testing.
Secondly, the air supply system 1 is operated to provide a pressure environment for the internal flow field of the jet flow fan 10.
Thirdly, the jet flow fan 10 is started, the gas supply system 1 is adjusted to ensure that the jet flow fan 10 is normally started, the pressure transmitter 3 records the starting pressure in real time, the temperature sensor 4 records the initial temperature in real time, and the gas vortex flowmeter 2 records the gas volume flow in real time, so that the jet flow fan 10 is ensured to be normally used.
And fourthly, starting the digital display instrument 5, and transmitting the starting pressure, the initial temperature and the gas volume flow data to the data processing system 6 through the sensor 20.
And fifthly, starting the two particle generators 7, and inputting corresponding trace particles 40 to the jet fan 10 according to two gases with different densities conveyed by the gas supply system 1.
And sixthly, starting the two lasers 8 and adjusting the angle of the prism 70 so that the sheet light source emitted by the lasers 8 can scan the whole two-dimensional plane of the area to be measured of the jet fan 10.
And seventhly, starting the camera 9 with the filter 91, and recording the flow track of the tracer particles 40 in real time.
Eighthly, starting the first pulse counter 30 to record the vector displacement of the starting pressure, the volume flow of the gas and the initial temperature of the jet fan 10, simultaneously starting the second pulse counter 50 to record the vector displacement of the trace particles 40, and transmitting the trace particles to the data processing system 6.
And ninthly, the data processing system 6 performs image processing and numerical calculation processing according to the starting pressure of the jet fan 10, the volume flow of the gas, the vector displacement of the initial temperature and the vector displacement of the tracer particles 40, so as to realize the performance test of the jet fan 10.
The first pulse counter 30 records the starting pressure of the jet fan 10, the volume flow of the gas and the vector displacement of the initial temperature and transmits the vector displacement to the data processing system 6; at the same time, the second pulse counter 50 records the vector displacement of the trace particles 40 and transmits the data to the data processing system 6; the data processing system 6 performs image processing and numerical calculation processing according to the starting pressure of the jet fan 10, the volume flow of the gas, the vector displacement of the initial temperature, and the vector displacement of the trace particles 10, so as to realize the performance test of the jet fan 10, and thus improve the accuracy of the measurement of the flow field characteristics inside the jet fan 10.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above should not be understood to necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. The utility model provides an inside flow field testing arrangement of efflux fan which characterized in that: the device comprises a gas supply system, a gas vortex flowmeter, a pressure transmitter, a temperature sensor, a digital display, a data processing system, a particle generator, a laser and a camera;
the air supply system provides a pressure environment for the internal flow field of the jet flow fan;
the gas vortex flow meter, the pressure transmitter and the temperature sensor are respectively arranged between the output end of the gas supply system and the input end of the jet flow fan and correspondingly measure the volume flow of the gas, the starting pressure of the jet flow fan and the initial temperature of the gas;
the digital display is arranged between the output end of the gas supply system and the input end of the jet flow fan, receives the gas volume flow measured by the gas vortex flow meter, the starting pressure of the jet flow fan measured by the pressure transmitter and the initial temperature of the gas measured by the temperature sensor, and is connected with the sensor;
the data processing system is connected with the sensor and used for receiving the gas volume flow, the starting pressure and the gas initial temperature data transmitted by the sensor; a first pulse counter is arranged between the data processing system and the sensor, records the starting pressure of the jet fan, the volume flow of the gas and the vector displacement of the initial temperature, and transmits the vector displacement to the data processing system;
the particle generator emits trace particles into the jet fan; the two particle generators are used for emitting corresponding trace particles into the jet fan according to two different-density gases conveyed by the gas supply system;
the laser emits a sheet light source into the jet fan;
the camera tracks the flow track of the tracer particles, the vector displacement of the tracer particles is recorded through the second pulse counter, the second pulse counter transmits data to the data processing system, and the data processing system performs image processing and numerical calculation processing according to the starting pressure of the jet fan, the volume flow of gas, the vector displacement of initial temperature and the vector displacement of the tracer particles, so that the performance test of the jet fan is realized.
2. The internal flow field testing device of the jet flow fan as claimed in claim 1, wherein: the two lasers are respectively arranged to emit light from different angles to the middle and scan the whole two-dimensional plane where the tracer particles flow in the jet fan.
3. The internal flow field testing device of the jet flow fan as claimed in claim 2, wherein: and each laser emitting sheet light source respectively passes through the prism and then sweeps the whole two-dimensional plane where the tracer particles flow in the jet fan.
4. The internal flow field testing device of the jet flow fan as claimed in claim 1, wherein: the outer wall of the jet fan is made of resin glass.
5. The internal flow field testing device of the jet flow fan as claimed in claim 1, wherein: the camera is provided with a filter.
6. The internal flow field testing device of the jet flow fan as claimed in claim 1, wherein: the air supply system comprises an air compressor, a high-pressure air storage tank, a shutoff valve, a pressure gauge, a buffer air tank and a dryer which are sequentially connected in series, the dryer is connected with a gas vortex flowmeter, the high-pressure air storage tank and the buffer air tank are respectively connected with a safety valve, and a pressure relief valve is connected in parallel on a connecting pipeline between the pressure gauge and the buffer air tank.
7. The internal flow field testing device of the jet flow fan as claimed in claim 6, wherein: the pressure of the gas delivered by the gas supply system is 0-0.7 MPa.
8. A method for testing an internal flow field of a jet fan comprises the following steps:
firstly, checking the air tightness of a testing device and carrying out safety performance testing;
operating the air supply system to provide a pressure environment for the internal flow field of the jet flow fan;
thirdly, starting the jet flow fan, adjusting the gas supply system to ensure the normal start of the jet flow fan, recording the start pressure in real time by the pressure transmitter, recording the initial temperature in real time by the temperature sensor, recording the volume flow of the gas by the gas vortex flowmeter in real time, and ensuring the normal use of the jet flow fan;
fourthly, starting a digital display instrument, and transmitting the starting pressure, the initial temperature and the gas volume flow data to a data processing system through a sensor;
fifthly, starting the two particle generators, and inputting corresponding tracer particles to the jet fan according to two gases with different densities conveyed by the gas supply system;
sixthly, starting the two lasers, and debugging the angle of the prism so that a sheet light source emitted by the lasers can scan the whole two-dimensional plane of the area to be measured of the jet fan;
starting a camera with a filter, and recording the flow track of the tracer particles in real time;
starting a first pulse counter to record the starting pressure of the jet flow fan, the volume flow of the gas and the vector displacement of the initial temperature, simultaneously starting a second pulse counter to record the vector displacement of the tracer particles, and conveying the tracer particles to a data processing system;
and ninthly, the data processing system performs image processing and numerical calculation processing according to the starting pressure of the jet fan, the volume flow of the gas, the vector displacement of the initial temperature and the vector displacement of the tracer particles, so as to realize the performance test of the jet fan.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112160715A (en) * | 2020-09-28 | 2021-01-01 | 中国石油大学(华东) | Instantaneous high-flow pulse jet experiment system and experiment method thereof |
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