Particle image velocity measurement device and method suitable for icing wind tunnel

Abstract

The invention provides a particle image velocity measurement device and method suitable for an icing wind tunnel, and belongs to the technical field of particle image velocity measurement. Comprising a particle putting system, the particle putting system comprises a manufacturing device and putting equipment, the manufacturing device is used for manufacturing water into liquid drops, the liquid drops are used as tracer particles of the particle image velocity measurement device, the putting equipment is communicated with the manufacturing device, and an outlet of the putting equipment is arranged towards a measurement area. The liquid drops manufactured by the manufacturing device are put into the measuring area; the illumination system is used for providing light rays for the measurement area; the shooting system is used for shooting tracer particles in the measurement area; and the control system is in signal connection with the particle delivery system, the illumination system and the shooting system, and calculates the velocity field of the measurement area. According to the invention, water is made into liquid drops, the liquid drops are used as tracer particles, the tracer particles are prevented from blocking a nozzle of a spraying system, and a particle image velocity measurement test can be carried out in an icing wind tunnel.

Description

Technical Field

[0001] The present invention belongs to the technical field of particle image velocimetry, and in particular relates to a particle image velocimetry device and method suitable for an icing wind tunnel. Background Art

[0002] An icing wind tunnel is a special wind tunnel with complex performance. It is a ground test equipment for studying the icing characteristics of the windward surface of an aircraft flying under icing meteorological conditions and its anti-icing technology. An icing wind tunnel usually consists of a tunnel structure, power system, refrigeration system, spray system, altitude simulation system, measurement and control system, safety monitoring system, model support system, wind tunnel component anti-icing system, and anti-icing simulation system. It can not only simulate wind speed, but also simulate environmental conditions such as low pressure, low temperature, and humidity.

[0003] Particle Image Velocimetry (PIV) is a non-invasive, indirect, full-field, instantaneous, quantitative flow field velocity measurement technology that integrates optics, computer vision, and image processing technologies. It has been widely used in the measurement of various types of flows, from steady flow to unsteady flow, from low-speed flow to high-speed flow, from single-phase flow to multi-phase flow. Its basic principle is to select appropriate tracer particles and place them in the fluid to be measured, illuminate and photograph the particles in the fluid twice within a very short time interval, and then indirectly calculate the velocity of the fluid through the displacement of the particles.

[0004] If we can conduct particle image velocimetry tests in icing wind tunnels and measure the flow around an aircraft after icing, it will greatly deepen our understanding of the aerodynamic characteristics of aircraft under icing conditions, and thus promote the development of aircraft anti-icing and de-icing technology. However, it is not possible to conduct particle image velocimetry tests in icing wind tunnels at present because the tracer particles commonly used in particle image velocimetry technology easily clog the nozzles of the spray system of icing wind tunnels. In the measurement of low-speed air flow, the tracer particles commonly used in particle image velocimetry technology are droplets of olive oil, alcohols, etc. These droplets have high viscosity and are not easy to volatilize; and the spray system of an icing wind tunnel is usually composed of a water supply system, an air supply system, and a nozzle array. There are small holes on the nozzles for spraying water mist to simulate a foggy environment, and the small holes are easily clogged by the above-mentioned tracer particles. Summary of the invention

[0005] The purpose of this application is to provide a particle image velocimetry device and method suitable for an icing wind tunnel to solve the above-mentioned technical problems existing in the prior art.

[0006] This application is implemented as follows: In a first aspect, an embodiment of the present application provides a particle image velocimetry device suitable for an icing wind tunnel, comprising: a particle delivery system, the particle delivery system comprising a manufacturing device and a delivery device, the manufacturing device being used to produce water into droplets, the droplets being used as tracer particles of the particle image velocimetry device, the delivery device being connected to the manufacturing device, and the outlet of the delivery device being arranged toward a measurement area so as to deliver the droplets produced by the manufacturing device to the measurement area; an illumination system, the illumination system being used to provide light to the measurement area; a shooting system, the shooting system being used to shoot tracer particles in the measurement area; a control system, the control system being connected to the particle delivery system, the illumination system and the shooting system signals, and calculating the velocity field of the measurement area.

[0007] In the second aspect, an embodiment of the present application provides a particle image velocimetry method suitable for an icing wind tunnel, using the particle image velocimetry device provided in the embodiment of the first aspect, and the specific operating steps are as follows: turn on the icing wind tunnel; add water to the manufacturing device of the particle delivery system; turn on the particle delivery system, and the manufacturing device makes water into droplets and delivers them into the measurement area for use as tracer particles; turn on the lighting system to illuminate the tracer particles in the measurement area, and turn on the shooting system to shoot the tracer particles in the measurement area; the control system obtains the shooting results of the shooting system and calculates the velocity field of the measurement area.

[0008] The technical solution adopted by the present invention can achieve the following beneficial effects: In the present application, water is processed by a manufacturing device to make water into droplets, and the droplets are used as tracer particles of a particle image velocimetry device. The droplets made of water will not clog the nozzles of the spray system of the icing wind tunnel, nor will they pollute the environment of the icing wind tunnel and its internal equipment. Therefore, particle image velocimetry tests can be carried out in the icing wind tunnel to obtain the velocity field around the aircraft before and after icing in the icing wind tunnel, which is convenient for subsequent de-icing and anti-icing research. At the same time, water is used as the raw material for tracer particles, which is safe and non-toxic and will not cause damage to the bodies of test personnel and other equipment in the icing wind tunnel. At the same time, water is low-cost and easy to obtain. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0010] Figure 1 is a schematic diagram of the overall structure of a speed measuring device provided in some embodiments of the present application; Figure 2 This is a schematic diagram of the structure of the particle delivery system provided in some embodiments of the present application. Figure 1 ; Figure 3 This is a schematic diagram of the structure of the particle delivery system provided in some embodiments of the present application. Figure 2 ; Figure 4 is a schematic diagram of the structure of a lighting system provided by some embodiments of the present application; Figure 5 is a schematic diagram of the structure of a shooting system provided in some embodiments of the present application; Figure 6 is a schematic diagram of the structure of a control system provided by some embodiments of the present application; Figure 7 is a tracer particle image 1 taken using a velocity measuring device provided in some embodiments of the present application; Figure 8 is a second tracer particle image taken using a velocity measuring device provided in some embodiments of the present application; Fig. 9 is a velocity field 1 calculated using a velocity measuring device provided in some embodiments of the present application; Fig.10 It is the velocity field 2 calculated using the velocity measuring device provided in some embodiments of the present application.

[0011] In the figure: 100 - particle delivery system, 110 - air compression equipment, 120 - atomization equipment, 130 - centrifugal fan, 140 - guide pipe, 150 - heating equipment, 160 - return pipe, 200 - lighting system, 210 - laser, 220 - optical lens group, 300 - shooting system, 310 - camera, 320 - constant temperature box, 321 - observation window, 400 - control system, 410 - synchronizer, 420 - computer, 500 - tracer particles. DETAILED DESCRIPTION

[0012] The following description provides many different embodiments or examples for implementing different features of the present invention. The components and arrangements described in the following specific examples are only used to simplify the present invention and are only used as examples, not to limit the present invention.

[0013] The present application embodiment provides a particle image velocimetry device suitable for an icing wind tunnel, referring to Figures 1 to 6 As shown, the particle image velocimetry device includes a particle delivery system 100 , an illumination system 200 , a shooting system 300 and a control system 400 .

[0014] The particle delivery system 100 is used to deliver the tracer particles 500 into the measurement area. The measurement area is the area in the icing wind tunnel where the velocity field measurement is required. The particle delivery system 100 includes a manufacturing device and a delivery device. The manufacturing device is used to make water into droplets, and the droplets are used as tracer particles 500 of the particle image velocimetry device. The delivery device is connected to the manufacturing device. After the manufacturing device makes water into droplets, the droplets enter the delivery device, and the outlet of the delivery device is set toward the measurement area, so that the droplets produced by the manufacturing device are delivered to the measurement area.

[0015] The illumination system 200 can emit light to provide light to the measurement area, illuminating the tracer particles 500, ie, the droplets, located in the measurement area. When the tracer particles 500 are subsequently photographed, the positions of the tracer particles 500 are clear.

[0016] The photographing system 300 is used to photograph the tracer particles 500 in the measurement area. After the illumination system 200 illuminates the tracer particles 500, the photographing system 300 records the positions of the tracer particles 500 to facilitate the subsequent calculation of the velocity field.

[0017] The control system 400 performs overall control. The control system 400 is signal-connected to the particle delivery system 100, the lighting system 200 and the shooting system 300, and can control the start-up and shutdown of other systems. At the same time, the control system 400 can also receive information from other systems, especially the information from the shooting system 300, and calculate the velocity field based on the images taken by the shooting system 300.

[0018] The calculation principle of the particle image velocimeter is the same as that of the particle image velocimeter in the prior art, and will not be described in detail in this application. Different from the prior art, in this application, water is used as the raw material of the tracer particles 500 used in the particle image velocimeter. In the icing wind tunnel, the nozzle of its spray system is used to spray water mist. Water is used as the raw material for the tracer particles 500. Even if the tracer particles 500 come into contact with the nozzle of the spray system, it will not cause pollution or damage to the nozzle, and it will not clog the small holes of the nozzle. Therefore, the particle image velocimeter test can be carried out normally in the icing wind tunnel, and the velocity field around the aircraft before and after icing can be calculated and obtained, which is convenient for subsequent de-icing and anti-icing research.

[0019] It should be noted that when conducting the particle image velocimetry test, it is necessary to avoid the operation of the spray system in the icing wind tunnel. That is, the particle image velocimetry test is generally carried out before or after icing, so as to avoid the fog in the icing wind tunnel from being confused with the tracer particles 500 released by the particle delivery system 100, thereby affecting the final calculated velocity field data.

[0020] Using water as the raw material of the tracer particles 500 is not only low-cost and easy to obtain, but also safe and non-toxic. Even if the test personnel inhale some of the tracer particles 500, it will not cause any effect on the human body, or almost no effect. The tracer particles 500 made of water will not cause damage to the body of the test personnel, nor will they cause damage to other equipment in the icing wind tunnel. In some preferred embodiments of the present application, the particle size of the droplets manufactured by the manufacturing device is preferably less than or equal to 5 microns. After many tests, when the particle size of the droplets is less than or equal to 5 microns, the accuracy of the calculated velocity field is higher.

[0021] The manufacturing device is used to manufacture water into droplets. In some embodiments, reference Figure 2 and Figure 3 As shown, the manufacturing device includes an air compression device 110 and an atomization device 120 connected in sequence. Water can be stored in the atomization device 120. The water is generally pure water to reduce impurities in the water. The air compression device 110 generates high-pressure air, which is passed into the atomization device 120 connected to the air compression device 110. The water in the atomization device 120 can be broken into droplets driven by the high-pressure air and used as tracer particles 500.

[0022] In some specific embodiments, an air compression pump is generally selected as the air compression device 110. In other embodiments, an air compressor can also be selected as the air compression device 110, and the operator selects it according to the specific test scale. The atomization device 120 can be a compressed air atomizer, which generates a high-speed airflow through compressed air. According to the Venturi effect, the high-speed airflow will generate negative pressure locally, and the liquid will mix with the high-speed airflow at the nozzle under the action of the negative pressure, and will be ejected with the airflow and hit the baffle, and finally broken into droplets.

[0023] In other embodiments of the present application, the manufacturing device may also select an ultrasonic atomizer. The manufacturing device may use other equipment that can break up droplets into small-size droplets, which may be commercially available equipment, and is not limited to the specific equipment provided in the embodiments of the present application.

[0024] In some embodiments of the present application, reference Figure 2 and Figure 3 As shown, the delivery device includes a centrifugal fan 130 and a guide tube 140 connected in sequence, the centrifugal fan 130 is connected to the atomization device 120, and the droplets in the atomization device 120 can flow into the centrifugal fan 130. The centrifugal fan 130 is used to drive the droplets to rotate so as to transport the droplets to the guide tube 140. The outlet of the guide tube 140 is arranged toward the measurement area so as to deliver the droplets to the measurement area.

[0025] The droplets formed by the air compression device 110 and the atomization device 120 have different particle sizes, some of which are larger and some of which are smaller. When the droplets rotate in the centrifugal fan 130, the droplets with larger particle sizes are more likely to hit the inner wall of the centrifugal fan 130 due to their greater weight, while the droplets with smaller particle sizes are more likely to enter the guide tube 140 under the drive of the centrifugal fan 130 and be dropped into the measurement area through the outlet of the guide tube 140.

[0026] By setting up the centrifugal fan 130, droplets with larger particle sizes are filtered out, and by adjusting the parameters of the centrifugal fan 130, only droplets that meet the particle size requirements can enter the guide tube 140, thereby improving the accuracy of the velocity field calculated subsequently.

[0027] In some embodiments of the present application, the centrifugal fan 130 has a collection chamber, which is used to collect droplets that hit the inner wall of the centrifugal fan 130. After the droplets with larger particle sizes hit the inner wall of the centrifugal fan 130, they flow into the collection chamber and are stored in the collection chamber. The liquid in the collection chamber can be directly discharged. In some preferred embodiments, a return pipe 160 can be connected between the collection chamber of the centrifugal fan 130 and the atomization device 120, see Figure 3 As shown, the liquid in the collection chamber can flow back into the atomization device 120, and hit the internal baffle of the atomizer again under the drive of the high-pressure air, and be broken into droplets again.

[0028] By setting the centrifugal fan 130, not only can the particle size of the droplets be screened, so that only the droplets that meet the particle size requirements can enter the measurement area, but the droplets that do not meet the particle size requirements can be regrouped together and then flow back to the atomization device 120 to be re-prepared into droplets, thereby improving the utilization rate of the liquid. At the same time, since the liquid can flow back to the atomization device 120, the amount of droplets that can be produced can be roughly determined by the amount of liquid put into the atomization device 120 at the beginning of the speed measurement test, thereby adapting the size of the measurement area, avoiding the situation where there are too many or too few tracer particles 500 in the measurement area, and improving the accuracy of the velocity field calculated subsequently.

[0029] The temperature in the freezing wind tunnel is generally below zero. Since water is used as the raw material of the tracer particles 500, in some embodiments of the present application, the particle delivery device also includes a heating device 150, which is used to heat the atomization device 120 to increase the temperature of the water in the atomization device 120. This prevents the water in the atomization device 120 from freezing due to the low temperature environment of the freezing wind tunnel. At the same time, since the water in the atomization device 120 has a certain temperature, after the water in the atomization device 120 is broken into droplets under the action of high-pressure air, the droplets are delivered to the measurement area. The droplets have a certain initial temperature, and the droplets are not easy to freeze, so as to avoid or reduce the influence of the phase change of the droplets on the velocity field measurement as much as possible.

[0030] The heating device 150 is used to provide heat for the water in the atomizing device 120 to maintain the temperature of the water in the atomizing device 120 between 20 degrees Celsius and 40 degrees Celsius. The temperature of the water in the atomizing device 120 cannot be too high. After the water is broken into droplets, it is dropped into the measurement area as a tracer particle 500. If the temperature of the droplets is too high, the droplets will hit the ice wind tunnel and the surface of the frozen model, causing the ice to melt, thereby affecting the test results. In some preferred embodiments, the water temperature in the atomizer is constant at 30 degrees.

[0031] In some specific implementations, the heating device 150 may be an electric heating device 150. The electric heating device 150 surrounds the atomizing device 120 to heat the atomizing device 120 uniformly.

[0032] The composition of the lighting system 200 is similar to that of the prior art, see Figure 4 As shown, the illumination system 200 includes a laser 210 and an optical lens group 220. The optical lens group 220 is installed at the light source outlet of the laser 210 to expand the point light emitted by the laser 210. The light emitted by the illumination system 200 can be roughly regarded as a plane. In the velocity measurement test of the tracer particle 500, the light plane formed by the illumination system 200 roughly overlaps with the plane formed by the test area to be measured, and the tracer particles 500 in the measurement area are illuminated.

[0033] The laser 210 and the optical lens can be directly selected from commercial products. For example, the laser 210 can use a neodymium-doped yttrium aluminum garnet crystal or a neodymium-doped yttrium lithium fluoride crystal double pulse laser 210 to output high-energy point laser. The optical lens group 220 uses a combination of convex and concave lenses with different focal lengths to expand the point light output by the laser 210 into a sheet light with uniform intensity and a thickness of about 1 mm.

[0034] The shooting system 300 includes a camera 310, a constant temperature box 320 and a heating device. Figure 5As shown, the camera 310 is installed inside the thermostat 320, and the heating device is used to heat the inside of the thermostat 320. The temperature in the icing wind tunnel is low, which can easily affect the normal operation of the camera 310. The heating device is set to heat the inside of the thermostat 320 and adjust the temperature inside the thermostat 320, so as to ensure that the camera 310 can work normally and capture images normally.

[0035] It should also be noted that the thermostat 320 should not affect the camera 310 from photographing the measurement area. The thermostat 320 is generally provided with an observation window 321. Figure 5 As shown, the visible light band transmittance of the observation window 321 is greater than 90%, and the observation window 321 is arranged corresponding to the lens of the camera 310, and the camera 310 can directly shoot the measurement area through the observation window 321. In some specific embodiments, the observation window 321 is made of optical glass material, which has a high transmittance. The larger the visible light band transmittance of the observation window 321, the better.

[0036] The thermostat 320 can also be configured as an insulation box to avoid heat exchange between the inside and outside, or to reduce heat exchange between the inside and outside. Exemplarily, the shell of the thermostat 320 is configured as a three-layer structure of color steel plate, heat insulation cotton and stainless steel, and the color steel plate is located at the outermost layer. In some preferred embodiments, a microcontroller unit and a temperature sensor are also installed inside the thermostat 320. The microcontroller unit and the temperature sensor cooperate with the heating device to maintain the temperature inside the thermostat 320, so that the temperature inside the thermostat 320 can be maintained within a preset range.

[0037] In some embodiments of the present application, the heating device of the shooting system 300 can be a heat pipe and a blower. The heat pipe generates heat, and the blower is used to heat the inside of the constant temperature box 320 in the form of blowing air. The operating temperature of the camera 310 is generally between 0 degrees Celsius and 45 degrees Celsius. Too high a temperature will affect the heat dissipation of the camera 310, thereby affecting the normal use of the camera 310. Preferably, the internal temperature of the constant temperature box 320 is set to be stable at about 20 degrees Celsius.

[0038] According to the different sizes of the icing wind tunnel and the different sizes of the measurement area, a lens with a suitable focal length can be selected for shooting according to the shooting range and shooting distance to ensure that as many tracer particles 500 as possible can be captured.

[0039] The control system 400 controls the hardware devices in the entire device. Figure 6As shown, the control system 400 includes a synchronizer 410, which is connected to the lighting system 200 and the shooting system 300 by signal. The synchronizer 410 is used to synchronously output a trigger signal to the lighting system 200 and the shooting system 300, so that the laser 210 of the lighting system 200 and the camera of the shooting system 300 run synchronously, and clear image information of the position of the tracer particles 500 is obtained.

[0040] The control system 400 also includes a computer 420, on which the PIV software is loaded. The PIV software is used to process the test data, including steps such as calibration, image pre-processing, cross-correlation calculation, and velocity field post-processing, and finally calculates the velocity field in the measurement area. The PIV software directly uses the PIV software in the prior art, and the present application does not improve the PIV software. The computer 420 can also control the startup and shutdown of the particle delivery system 100 and the operation of the control synchronizer 410.

[0041] The present application also provides a particle image velocimetry method applicable to an icing wind tunnel. Using the particle image velocimetry device provided in any of the above embodiments, the specific operation steps are as follows: S1: Open the icing wind tunnel. The specific parameters in the icing wind tunnel are set according to the working conditions to be tested, and the parameters generally include wind speed, temperature, air pressure, liquid water content, etc.

[0042] S2: Add water to the manufacturing device of the particle delivery system 100 to prepare for manufacturing the tracer particles 500. When the manufacturing device includes an air compression device 110 and an atomization device 120, water is directly added to the location of the atomization device 120 corresponding to the water storage. Purified water is generally selected.

[0043] S3: The particle delivery system 100 is turned on, and the manufacturing device produces water into droplets and delivers them into the measurement area for use as tracer particles 500. After the manufacturing device produces water into droplets, the droplets enter the delivery device and are delivered into the measurement area through the outlet of the delivery device.

[0044] S4: After the tracer particles 500 are placed in the measurement area, the lighting system 200 and the shooting system 300 can be turned on to illuminate and shoot the tracer particles 500 in the measurement area. The lighting system 200 illuminates the tracer particles 500 in the measurement area, and the shooting system 300 shoots the tracer particles 500 in the measurement area. The lighting system 200 and the shooting system 300 are generally started synchronously to ensure that in the image information captured by the shooting system 300, the tracer particles 500 in the measurement area are illuminated by the light of the lighting system 200. In some embodiments, the control system 400 includes a synchronizer 410, which synchronously outputs a trigger signal to the shooting system 300 and the lighting system 200 to ensure that both are started at the same time.

[0045] When using the speed measuring device to test the velocity field in the icing wind tunnel, the image information obtained by the shooting system 300 can refer to Figure 7 and Figure 8 As shown, in Figure 7 and Figure 8 In the figure, the tracer particles 500 emit light under the illumination of the lighting system 200, and no other lighting equipment is turned on in the icing wind tunnel. Therefore, under the photography of the photography system 300, the position of the luminous tracer particles 500 is clear, which is convenient for the subsequent velocity field calculation.

[0046] S5: The control system 400 obtains the shooting result of the shooting system 300, that is, the control system 400 obtains the image information shot by the shooting system 300, and the control system 400 processes the image information to calculate the velocity field of the measurement area. The control system 400 includes a computer 420, on which the PIV software is loaded, and the image information is processed by the PIV software to finally calculate the velocity field of the measurement area.

[0047] The velocity field calculated based on the image information obtained by the shooting system 300 can be referred to Fig. 9 and Fig.10 As shown, Fig. 9 and Fig.10 The velocity field in the image is obtained by calculating the velocity of the airflow through the displacement of tracer particles 500 made of water. The velocity field obtained is clear and accurate, and can capture the velocity changes of the airflow in detail.

[0048] Before running the particle image velocimeter, it is necessary to install the particle image velocimeter to the corresponding position of the icing wind tunnel.

[0049] The particle delivery system 100 is installed upstream of the measurement area, referring to Figure 1 As shown, the outlet of the delivery device extends into the wind tunnel through the wind tunnel pressure regulating seam or other interface. In the case where the particle delivery system 100 also includes a heating device 150, the heating device 150 is turned on at the same time to heat the water in the atomization device 120. Figure 1 In the figure, the tracer particles 500 released by the particle delivery system 100 are represented by black dots.

[0050] The lighting system 200 is usually installed outside the icing wind tunnel. The lighting system 200 needs to illuminate the tracer particles 500 in the measurement area, and the light emitted by the lighting system 200 needs to cover as much of the measurement area as possible. Preferably, the lighting system 200 is placed parallel to the measurement area. The light emitted by the lighting system 200 is generally roughly a plane with thickness. The measurement area is generally a plane with thickness. Parallel means that the plane formed by the lighting system 200 coincides with the plane formed by the measurement area, so that the tracer particles 500 in the measurement area are as far as possible within the lighting range of the lighting system 200. The light range of the lighting system 200 can be referred to. Figure 1 shown.

[0051] The shooting system 300 is also directly installed in the icing wind tunnel, and the shooting range of the shooting system 300 needs to include as much of the measurement area as possible. Preferably, the shooting system 300 is placed perpendicular to the measurement area. Perpendicular means that the axis of the lens of the camera 310 of the shooting system 300 is set perpendicular to the measurement area, so that the measurement area is as far as possible within the shooting range of the shooting system 300.

[0052] In addition, it should be noted that the particle image velocimetry device needs to be used before or after freezing to avoid confusion between fog and tracer particles 500 during the freezing process, which may affect the final velocity field data results.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A particle image velocimetry device suitable for an icing wind tunnel, characterized in that: include: A particle delivery system (100), the particle delivery system (100) comprising a manufacturing device and a delivery device, the manufacturing device being used to produce water into droplets, the droplets being used as tracer particles (500) of the particle image velocimetry device, the delivery device being connected to the manufacturing device, the outlet of the delivery device being arranged toward a measurement area, so as to deliver the droplets produced by the manufacturing device to the measurement area; An illumination system (200), the illumination system (200) being used to provide light to a measurement area; A photographing system (300), wherein the photographing system (300) is used to photograph tracer particles (500) in a measurement area; A control system (400) is connected to the particle delivery system (100), the lighting system (200) and the shooting system (300) via signals, and calculates a velocity field in the measurement area.

2. A particle image velocimetry device suitable for an icing wind tunnel according to claim 1, characterized in that: The manufacturing device comprises an air compression device (110) and an atomization device (120) which are connected in sequence, wherein the air compression device (110) is used to pass high-pressure air into the atomization device (120), and water in the atomization device (120) can be broken into droplets under the drive of the high-pressure air.

3. The particle image velocimetry device suitable for an icing wind tunnel according to claim 2, characterized in that: The delivery device comprises a centrifugal fan (130) and a flow guide tube (140) which are connected in sequence, the centrifugal fan (130) being in communication with the atomization device (120), the centrifugal fan (130) being used to drive the liquid droplets to rotate so as to transport the liquid droplets to the flow guide tube (140), and the outlet of the flow guide tube (140) being directed toward a measurement area so as to deliver the liquid droplets to the measurement area.

4. The particle image velocimetry device suitable for an icing wind tunnel according to claim 3, characterized in that: The centrifugal fan (130) has a collection chamber, and the collection chamber is used to collect liquid droplets that impact the inner wall of the centrifugal fan (130).

5. The particle image velocimetry device suitable for an icing wind tunnel according to claim 4, characterized in that: A return pipe (160) is connected between the collection chamber of the centrifugal fan (130) and the atomization device (120).

6. The particle image velocimetry device suitable for an icing wind tunnel according to claim 2, characterized in that: The particle delivery system (100) further comprises a heating device (150), wherein the heating device (150) is used to provide heat to the water in the atomization device (120) so as to maintain the temperature of the water in the atomization device (120) between 20 degrees Celsius and 40 degrees Celsius.

7. The particle image velocimetry device suitable for an icing wind tunnel according to claim 1, characterized in that: The lighting system (200) comprises a laser (210) and an optical lens group (220); the optical lens group (220) is installed at a light source outlet of the laser (210).

8. The particle image velocimetry device suitable for an icing wind tunnel according to claim 1, characterized in that: The shooting system (300) comprises a camera (310), a constant temperature box (320) and a heating device, wherein the camera (310) is installed inside the constant temperature box (320), the constant temperature box (320) is provided with an observation window (321), the light transmittance of the observation window (321) in the visible light band is greater than 90%, the observation window (321) is arranged corresponding to the lens of the camera (310), and the heating device is used to heat the inside of the constant temperature box (320).

9. The particle image velocimetry device suitable for an icing wind tunnel according to claim 1, characterized in that: The control system (400) comprises a synchronizer (410), and the synchronizer (410) is used to synchronously output a trigger signal to the lighting system (200) and the shooting system (300).

10. A particle image velocimetry method suitable for an icing wind tunnel, characterized in that: Using the particle image velocimetry device according to any one of claims 1 to 9, the specific operating steps are as follows: Open the icing wind tunnel; Adding water to a manufacturing device of a particle delivery system (100); The particle delivery system (100) is turned on, and the manufacturing device produces water into liquid droplets and delivers them into the measurement area for use as tracer particles (500); Turning on the lighting system (200) to illuminate the tracer particles (500) in the measurement area, and turning on the photographing system (300) to photograph the tracer particles (500) in the measurement area; The control system (400) obtains the shooting results of the shooting system (300) and calculates the velocity field of the measurement area.

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