An icing wind tunnel test system

Abstract

The invention discloses an icing wind tunnel test system, and relates to the technical field of wind tunnel tests. The system includes a wind tunnel body and an ice particle preparation component located in the wind tunnel body, the ice particle preparation component includes an air inlet channel, a liquid inlet channel, an atomizer and a Laval nozzle, the inlet of the air inlet channel is connected to the air inlet device, the inlet of the liquid inlet channel is connected to the water inlet device, the outlet of the air inlet channel and the outlet of the liquid inlet channel are also connected to the inlet of the atomizer, the outlet of the atomizer is also connected to the inlet of the Laval nozzle, and the distance between the outlet of the Laval nozzle and the wind tunnel inlet satisfies: L=D / 5~D / 2, L is the distance between the outlet of the Laval nozzle and the wind tunnel inlet, and D is the length of the wind tunnel body in the axial direction. The system can realize the use of ice particles as needed, eliminating the preparation and storage process of ice cubes, and the particle size of the ice particles is controllable.

Description

Technical Field

[0001] The invention relates to the technical field of wind tunnel testing, and in particular to an icing wind tunnel testing system. Background Art

[0002] Currently, ice wind tunnel tests mostly use a more traditional method, grinding the ice into powder and then adding it to the wind tunnel. This method currently faces two problems: first, the ice particles obtained by grinding are of varying sizes, and in many cases the ground ice particles cannot meet the experimental requirements well. The experimental pieces are prone to freezing, which can cause damage to the experimental pieces. Second, the preparation conditions are constrained. The ice must be ground before the experiment can be carried out, so the ice used in the experiment needs to be prepared and stored.

[0003] Therefore, providing an icing wind tunnel test system that can be produced on demand and has controllable ice particle size has become a technical problem that needs to be urgently solved by those skilled in the art. Summary of the invention

[0004] The invention discloses an icing wind tunnel test system to solve the technical problems in the related art that ice particles used in ice wind tunnel tests have different sizes and need to be stored and ground.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] The icing wind tunnel test system of the present invention comprises a wind tunnel body, wherein the wind tunnel body has a wind tunnel inlet and a wind tunnel outlet, and the airflow enters through the wind tunnel inlet and flows out from the wind tunnel outlet; the icing wind tunnel test system also comprises an ice particle preparation component, wherein the ice particle preparation component is located in the wind tunnel body, and the ice particle preparation component comprises an air inlet channel, a liquid inlet channel, an atomizer and a Laval nozzle, wherein the inlet of the air inlet channel is communicated with an air inlet device, the inlet of the liquid inlet channel is communicated with a water inlet device, the outlet of the air inlet channel and the outlet of the liquid inlet channel are also communicated with the inlet of the atomizer, the outlet of the atomizer is also communicated with the inlet of the Laval nozzle, and the distance between the outlet of the Laval nozzle and the wind tunnel inlet satisfies: L=D / 5~D / 2, wherein L is the distance between the outlet of the Laval nozzle and the wind tunnel inlet, and D is the length of the wind tunnel body in the axial direction.

[0007] According to an optional embodiment, the icing wind tunnel test system also includes a straightening net, which is located at the entrance of the wind tunnel, and the distance between the outlet of the Laval nozzle and the entrance of the wind tunnel is: the distance between the outlet of the Laval nozzle and the straightening net.

[0008] According to an optional implementation, when the wind tunnel body is cylindrical, the inner diameter of the wind tunnel body is D / 5~D / 3; or when the wind tunnel body is a rectangular parallelepiped, the height and width of the wind tunnel body are both D / 5~D / 3.

[0009] According to an optional embodiment, the ice particle preparation assembly also includes an air intake section, which is located between the outlet of the air intake channel and the outlet of the liquid inlet channel and the inlet of the Laval nozzle, and the atomizer is located at the inlet of the air intake section, and the air intake section and the Laval nozzle are detachably connected.

[0010] According to an optional embodiment, when the air intake section is cylindrical, the inner diameter of the air intake section is D / 40~D / 12, and the axial length of the air intake section is greater than or equal to D / 12; or when the air intake section is a rectangular parallelepiped, the height and width of the air intake section are both D / 40~D / 12, and the axial length of the air intake section is greater than or equal to D / 12.

[0011] According to an optional embodiment, the ice particle preparation assembly further includes a pressure sensor and a temperature sensor, and the pressure sensor and the temperature sensor are located at the air intake section.

[0012] According to an optional embodiment, the icing wind tunnel test system further includes a measuring component, which is located between the outlet of the Laval nozzle and the wind tunnel outlet, and is used to measure the particle size of ice particles on the cross section of the wind tunnel body.

[0013] According to an optional embodiment, the measuring component includes a particle size analyzer, a beam splitter and a receiver, the particle size analyzer and the beam splitter are close to the first side wall of the wind tunnel body, the receiver is close to the second side wall of the wind tunnel body, and the first side wall and the second side wall are arranged opposite to each other; and the beam splitter is located on the propagation path of the light emitted by the particle size analyzer, the beam splitter is used to disperse the laser emitted by the particle size analyzer into multiple beams, and the receiver is used to receive the multiple beams of light dispersed by the beam splitter.

[0014] According to an optional embodiment, the length of the beam splitter is equivalent to the height of the wind tunnel body; and / or the beam splitter and the particle size analyzer are spaced apart, and the distance between the beam splitter and the particle size analyzer is 1-3 cm.

[0015] According to an optional embodiment, the measuring component further includes a plurality of mechanical shutters, the number of the mechanical shutters is the same as the light beams dispersed by the beam splitter, the mechanical shutters are located on the propagation path of each light beam, and the plurality of mechanical shutters are opened in sequence.

[0016] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0017] In the first aspect, the icing wind tunnel test system of the present invention is provided with an ice particle preparation component in the wind tunnel body, and the ice particle preparation component includes an air inlet channel, a liquid inlet channel, an atomizer and a Laval nozzle. The air inlet channel is used for air to enter, and the liquid inlet channel is used for water to enter. Under the action of the airflow, the water can form water mist, and then the atomizer can further atomize the water. After the water mist enters the Laval nozzle, due to the structural characteristics of the Laval nozzle itself, the speed of the airflow passing through the Laval nozzle changes due to the change of the spray cross-sectional area. Specifically, the airflow changes from subsonic to sonic, and then accelerates to supersonic. During the acceleration process, when the gas flow rate increases, the static temperature of the gas will decrease. This temperature difference can be used to cool the water mist, thereby completing the preparation process of ice crystals. In addition, the prepared ice particles are all condensed from tiny droplets sprayed by the atomizer. By adjusting the atomization pressure of the atomizer, droplets of different particle size ranges can be sprayed, so that ice particles of different particle sizes can be prepared, and the controllability of the particle size of the ice particles is achieved.

[0018] That is, the icing wind tunnel test system of the present invention can realize the use of ice particles as they are made, eliminating the preparation and storage process of ice cubes. At the same time, the particle size of the ice particles is controllable, which solves the technical problems in the related art that the particle sizes of ice particles used in ice wind tunnel tests are different and the ice cubes need to be stored and ground.

[0019] Secondly, in the icing wind tunnel test system of the present invention, the distance between the outlet of the Laval nozzle and the wind tunnel entrance satisfies: L=D / 5~D / 2, and the outlet of the Laval nozzle is located at a certain distance from the wind tunnel entrance. The airflow here tends to be stable after flowing for a certain distance, so that the ice particles sprayed through the Laval nozzle can be evenly distributed in the wind tunnel, which helps to simulate the real icing environment, improve the accuracy of the test, and avoid the problem of uneven distribution of ice particles, which leads to overcooling or overheating of local areas in the wind tunnel body and affects the test conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments 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.

[0021] Figure 1 is a first schematic diagram of an icing wind tunnel test system according to an embodiment of the present application;

[0022] Figure 2 is a second schematic diagram of an icing wind tunnel test system according to an embodiment of the present application;

[0023] Figure 3 is a third schematic diagram of an icing wind tunnel test system according to an embodiment of the present application;

[0024] Figure 4 is a schematic diagram of an ice particle preparation assembly according to an embodiment of the present application;

[0025] Figure 5 is a schematic diagram of the measurement components of this application;

[0026] Figure 6 It is a schematic diagram of the ice particle size measurement in the related art;

[0027] Figure 7 It is a schematic diagram of the ice particle size measurement in the embodiment of the present application.

[0028] In the figure: 100, wind tunnel body; 110, wind tunnel entrance; 120, wind tunnel exit; 130, first side wall; 140, second side wall; 200, ice particle preparation component; 210, air inlet channel; 220, liquid inlet channel; 230, atomizer; 240, Laval nozzle; 250, air inlet section; 260, pressure sensor; 270, temperature sensor; 300, rectifier network; 400, measurement component; 410, particle size analyzer; 420, beam splitter; 430, receiver; 440, mechanical shutter. DETAILED DESCRIPTION

[0029] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0030] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0031] The following is combined with Figures 1 to 7 , the icing wind tunnel test system provided in the embodiment of the present application is described in detail through specific embodiments and their application scenarios.

[0032] The icing wind tunnel test system of this embodiment includes a wind tunnel body 100, such as Figure 1~Figure 3 The wind tunnel body 100 is used to simulate an icing environment, and various icing tests can be performed in the wind tunnel body 100. The wind tunnel body 100 is a cavity structure with two ends connected, such as Figure 1~Figure 3 The wind tunnel body 100 has a wind tunnel inlet 110 and a wind tunnel outlet 120. After the airflow enters the wind tunnel inlet 110, it flows out from the wind tunnel outlet 120. Figure 1~Figure 3 As shown, for example, the maximum wind speed of the wind tunnel body 100 is ≤300 m / s.

[0033] In some embodiments, the icing wind tunnel test system further includes an ice particle preparation assembly 200, and the ice particle preparation assembly 200 is located in the wind tunnel body 100, such as Figure 1~Figure 3 As shown. The ice particle preparation assembly 200 is used to prepare ice particles. Exemplarily, the ice particle preparation assembly 200 can be placed on a test platform (not shown) located in the wind tunnel body 100. By using the ice particle preparation assembly 200 located in the wind tunnel body 100 to prepare ice particles, during the icing wind tunnel test, ice particles can be prepared and used immediately, eliminating the preparation and storage process of ice cubes, which helps to simplify the test process.

[0034] Exemplarily, the ice particle preparation assembly 200 includes an air inlet passage 210, a liquid inlet passage 220, an atomizer 230, and a Laval nozzle 240. Figure 1~Figure 4 The inlet of the air inlet channel 210 is connected to the air inlet device, and the outlet of the air inlet channel 210 is connected to the inlet of the atomizer 230, as shown in FIG. Figure 4 The air inlet channel 210 is used to allow air to enter. The inlet of the liquid inlet channel 220 is connected to the water inlet device, and the outlet of the liquid inlet channel 220 is connected to the inlet of the atomizer 230, as shown in FIG. Figure 4 The liquid inlet channel 220 is used for water to enter. The outlet of the atomizer 230 is communicated with the inlet of the Laval nozzle 240.

[0035] Exemplarily, the atomizer 230 is a compressed air sprayer. By adjusting the atomization pressure of the atomizer 230, ice particles with a particle size of 50 μm to 1000 μm can be prepared to meet the particle size range required for the experiment.

[0036] Exemplarily, the Laval nozzle 240 is also called a Laval nozzle or a converging and diverging nozzle. The structure of the Laval nozzle 240 is prior art and will not be described in detail herein. The Laval nozzle 240 selected in this embodiment can realize the acceleration process of supersonic fluids of 1.2 Ma and above.

[0037] In the ice particle preparation component 200 of this embodiment, water can form water mist under the action of airflow, and then the atomizer 230 can further atomize the water. After the water mist enters the Laval nozzle 240, due to the structural characteristics of the Laval nozzle 240 itself, the speed of the airflow passing through the Laval nozzle 240 changes due to the change of the spray cross-sectional area. Specifically, the airflow changes from subsonic to sonic, and then accelerates to supersonic. During the acceleration process, when the gas flow rate increases, the static temperature of the gas will decrease. This temperature difference can be used to cool the water mist, thereby completing the preparation process of ice crystals. In addition, the prepared ice particles are all condensed from tiny droplets sprayed from the atomizer 230. By adjusting the atomization pressure of the atomizer 230, droplets of different particle size ranges can be sprayed, so that ice particles of different particle sizes can be prepared, and the controllability of the particle size of the ice particles is achieved.

[0038] That is, the icing wind tunnel test system of this embodiment can realize the on-demand use of ice particles, eliminating the preparation and storage process of ice cubes. At the same time, the particle size of the ice particles is controllable, which solves the technical problems in the related art that the particle size of ice particles used in ice wind tunnel tests is different and the ice cubes need to be stored and ground.

[0039] In some embodiments, the distance between the outlet of the Laval nozzle 240 and the wind tunnel entrance 110 satisfies: L=D / 5~D / 2. L is the distance between the outlet of the Laval nozzle 240 and the wind tunnel entrance 110, and D is the length of the wind tunnel body 100 in the axial direction. The length of the wind tunnel body 100 refers to the length of the wind tunnel body 100 along the airflow direction. The length of the wind tunnel body 100 can be set based on actual test requirements.

[0040] The inventors found in their research that the uniformity of the distribution of ice particles in the wind tunnel body 100 is affected by the airflow in the wind tunnel body 100. The wind speed in the wind tunnel body 100 is relatively high, and the airflow at the wind tunnel entrance 110 is blown in by a fan. The airflow blown in by the fan is in a strong turbulent state when it just enters the wind tunnel body 100. If the outlet of the Laval nozzle 240 is set at the wind tunnel entrance 110, the prepared ice particles will be blown into disorder by the turbulent wind tunnel airflow, thereby failing to achieve the expected ice wind tunnel experimental effect.

[0041] In the icing wind tunnel test system of this embodiment, the Laval nozzle 240 is placed at a distance L behind the wind tunnel entrance 110. The airflow tends to be stable after flowing for a certain distance, so that the ice particles sprayed through the Laval nozzle 240 can be evenly distributed in the entire ice wind tunnel environment, thereby achieving better test results.

[0042] In some embodiments, the icing wind tunnel test system further includes a straightening net 300, such as Figure 1~Figure 3As shown. The rectifying net 300 is located at the wind tunnel entrance 110. Exemplarily, the rectifying net 300 is a honeycomb net. Through the function of the rectifying net 300, the uniformity of the airflow in the wind tunnel body 100 can be improved, the airflow deflection angle and turbulence intensity can be reduced, so as to obtain an airflow with lower turbulence in the test section.

[0043] Exemplarily, the distance between the outlet of the Laval nozzle 240 and the wind tunnel entrance 110 is: the distance between the outlet of the Laval nozzle 240 and the straightening net 300. In the solution of this embodiment, the uniformity of the distribution of ice particles in the wind tunnel body 100 can be improved by two aspects: the straightening net 300 and the distance between the outlet of the Laval nozzle 240 and the wind tunnel entrance 110, so as to achieve better test results.

[0044] In some embodiments, when the wind tunnel body 100 is cylindrical, the inner diameter of the wind tunnel body 100 is D / 5-D / 3; or when the wind tunnel body 100 is a rectangular parallelepiped, the height and width of the wind tunnel body 100 are both D / 5-D / 3.

[0045] There is a process for the ice particles to mix with the mainstream air in the wind tunnel body 100 after being ejected, and the range of the ice particles gradually expands. If the radial size of the wind tunnel body 100 is too small, a large number of ice particles will hit the wall of the wind tunnel body 100 and cause uneven distribution of the ice particles; if the wind tunnel body 100 is too high, more ice particle mass is required to achieve the same experimental environment as an ice wind tunnel of appropriate size.

[0046] In the solution of this embodiment, by limiting the radial dimension of the wind tunnel body 100 , it is helpful to improve the uniformity of the distribution of ice particles in the wind tunnel body 100 .

[0047] In some embodiments, the ice particle production assembly 200 further includes an air intake section 250, such as Figure 2 and Figure 4 The air inlet section 250 is located between the outlet of the air inlet channel 210 and the outlet of the liquid inlet channel 220 and the inlet of the Laval nozzle 240, and the atomizer 230 is located at the inlet of the air inlet section 250, as shown in FIG. Figure 4 shown.

[0048] In the scheme of this embodiment, an air intake section 250 is arranged between the outlet of the air intake channel 210 and the outlet of the liquid intake channel 220 and the inlet of the Laval nozzle 240, and the atomizer 230 is located at the inlet of the air intake section 250, so that the water mist atomized by the atomizer 230 can be fully diffused in the air intake section 250 before entering the inlet of the Laval nozzle 240, so as to ensure that the water mist can evenly enter the Laval nozzle 240, thereby improving the uniformity of the ice particles produced by the Laval nozzle 240.

[0049] For example, when the air inlet section 250 is cylindrical, the inner diameter of the air inlet section 250 is D / 40 to D / 12, and the axial length of the air inlet section 250 is greater than or equal to D / 12; or when the air inlet section 250 is a rectangular parallelepiped, the height and width of the air inlet section 250 are both D / 40 to D / 12, and the axial length of the air inlet section 250 is greater than or equal to D / 12. This embodiment can ensure that the water mist is fully diffused in the air inlet section 250 by limiting the size of the air inlet section 250.

[0050] In some embodiments, the air intake section 250 is detachably connected to the Laval nozzle 240. Exemplarily, the air intake section 250 is detachably connected to the Laval nozzle 240 via a flange. In the solution of this embodiment, the air intake section 250 is detachably connected to the Laval nozzle 240, so that the Mach number of the gas at the outlet of the Laval nozzle 240 can be adjusted by replacing the Laval nozzle 240, thereby changing the mass per unit volume of the ice particles.

[0051] In some embodiments, the ice particle preparation assembly 200 further includes a pressure sensor 260 and a temperature sensor 270, and the pressure sensor 260 and the temperature sensor 270 are located at the air intake section 250, such as Figure 2 and Figure 4 The pressure sensor 260 and the temperature sensor 270 can observe the pressure and temperature of the water mist in the air intake section 250 to ensure that the pressure and temperature at the inlet end of the Laval nozzle 240 are within a suitable temperature range, thereby ensuring that the entire ice particle preparation process can proceed normally.

[0052] Exemplarily, the temperature of the air inlet section 250 is room temperature, and the gas flow rate of the air inlet section 250 is ≤40 m / s. Exemplarily, the pressure of the air inlet passage 210 is >0.3 MPa to ensure the pressure of the gas entering the inlet of the Laval nozzle 240, so that the air flow can still pass through the Laval nozzle 240 after accelerated decompression.

[0053] In some embodiments, the icing wind tunnel test system further includes a measurement component 400, such as Figure 2 , Figure 3 and Figure 5 As shown. The measuring assembly 400 is located between the outlet of the Laval nozzle 240 and the wind tunnel outlet 120, and the measuring assembly 400 is used to measure the particle size of ice particles on the cross section of the wind tunnel body 100. Exemplarily, the measuring assembly 400 is located in front of the wind tunnel test section. Figure 6 As shown, the conventional particle size analyzer 410 can only measure the particle size of ice particles on a line on the monitoring plane, and then expand it to the entire cross section through experience. The particle size distribution error of the ice particles obtained in this way is relatively large. In the solution of this embodiment, the particle size of ice particles on the entire cross section of the wind tunnel body 100 can be measured by the measuring component 400, so that the accurate measurement of the particle size of ice particles can be achieved.

[0054] In some embodiments, the measurement assembly 400 includes a particle size analyzer 410, a beam splitter 420, and a receiver 430, such as Figure 2 , Figure 3 and Figure 5 The particle size analyzer 410 and the beam splitter 420 are close to the first side wall 130 of the wind tunnel body 100, and the receiver 430 is close to the second side wall 140 of the wind tunnel body 100. The first side wall 130 and the second side wall 140 are arranged opposite to each other. Figure 2 and Figure 3 The beam splitter 420 is located on the propagation path of the light emitted by the particle size analyzer 410. The beam splitter 420 is used to disperse the laser light emitted by the particle size analyzer 410 into multiple beams. The receiver 430 is used to receive the multiple beams dispersed by the beam splitter 420. Figure 7 The particle size analyzer 410 is a laser particle size analyzer. The working principle of the laser particle size analyzer for measuring particle size is a prior art and will not be described in detail here.

[0055] Exemplarily, the length of the beam splitter 420 is comparable to the height of the wind tunnel body 100 , so that the multiple beams of light dispersed by the beam splitter 420 can cover the entire cross section of the wind tunnel body 100 .

[0056] Exemplarily, the beam splitter 420 is spaced apart from the particle size analyzer 410 , and the distance between the beam splitter 420 and the particle size analyzer 410 is 1-3 cm, thereby ensuring that the laser emitted by the particle size analyzer 410 can be transmitted to the beam splitter 420 and dispersed into multiple beams of light by the beam splitter 420 .

[0057] In the solution of this embodiment, the measuring component 400 includes a beam splitter 420, through which the laser beam emitted from the particle size analyzer 410 can be dispersed into multiple beams of light, each laser beam occupies a spatial position, and the separated laser beams can basically realize the particle size measurement of the entire observation section, such as Figure 7 That is, in the solution of this embodiment, the beam splitter 420 is used to expand the measurement range of the measurement component 400, and the particle sizes of ice particles on multiple lines on the monitoring plane can be measured. Compared with the traditional method of only measuring the particle size information of ice particles at one horizontal position of the cross section and then expanding it to the entire cross section through experience, the data obtained by the method of this embodiment is more accurate.

[0058] In some embodiments, the measuring assembly 400 further includes a plurality of mechanical shutters 440. The number of the mechanical shutters 440 is the same as the number of light beams dispersed by the beam splitter 420. The mechanical shutters 440 are located on the propagation path of each light beam, such as Figure 2 , Figure 3 and Figure 5Preferably, the multiple mechanical shutters 440 are opened in sequence. In the solution of this embodiment, the setting of the mechanical shutter 440 can effectively prevent the mutual influence of the measurement results between the laser beams, thereby improving the reliability of the measurement results.

[0059] Specifically, a mechanical shutter 440 is installed after the laser beam. The mechanical shutter 440 can reach a speed of 1 / 8000 second. Through the shielding effect of the mechanical shutter 440, the laser can be shielded when the particle size measurement is not needed, which can effectively prevent the mutual influence of the measurement results between the laser beams, thereby making the optical signals independent of each other.

[0060] For example, the mechanical shutter 440 can be controlled by programming to open in a certain order. For example, the shutter of the first laser beam can be opened first, and the particle size can be measured using the first laser beam; then the mechanical shutter 440 of the second laser beam can be opened while the mechanical shutter 440 of the first laser beam is closed, and so on, until all laser beams are controlled in a predetermined order. In this way, the computer can process signals in a certain order to avoid mutual interference between signals.

[0061] The function of the receiver 430 is to receive the optical signal with information. The receiver 430 transmits the received optical signal to the computer, and the computer receives and analyzes the obtained optical signal. For example, the laser particle size analyzer receives and detects the intensity and angle distribution of the scattered light of the particles, and then obtains the size distribution of the particles through signal processing and data analysis. The computer can output a particle size distribution diagram based on the measured particle size, which can display the size range of the measured particle size and the percentage it occupies. The size and percentage of the prepared ice particles can be roughly seen through the normal distribution diagram. The operation of outputting the particle size and the proportion can be achieved through existing particle analysis software, which will not be repeated here.

[0062] Furthermore, the volume proportion of various ice particles can be obtained by the proportion of ice particle size, and the volume of each particle size can be obtained by the sphere volume calculation formula. Combined with the outlet cross-sectional area and outlet flow rate of the pipeline, the volume flow rate of ice particles passing through the pipeline per unit time can be calculated. For each particle size interval, the mass flow rate can be calculated by the product of the density of the ice particles and the volume flow rate of each particle size interval. Finally, the total mass flow rate is added to obtain the total mass of the prepared ice particles, so that the icing wind tunnel test system of this embodiment can be used to simulate different icing environments.

[0063] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0064] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An icing wind tunnel test system, characterized in that: The wind tunnel body (100) comprises a wind tunnel inlet (110) and a wind tunnel outlet (120), wherein airflow enters through the wind tunnel inlet (110) and flows out from the wind tunnel outlet (120); The icing wind tunnel test system further comprises an ice particle preparation assembly (200), wherein the ice particle preparation assembly (200) is located in the wind tunnel body (100). The ice particle preparation assembly (200) comprises an air inlet channel (210), a liquid inlet channel (220), an atomizer (230) and a Laval nozzle (240); the inlet of the air inlet channel (210) is in communication with an air inlet device, the inlet of the liquid inlet channel (220) is in communication with a water inlet device, the outlet of the air inlet channel (210) and the outlet of the liquid inlet channel (220) are also in communication with the inlet of the atomizer (230), the outlet of the atomizer (230) is also in communication with the inlet of the Laval nozzle (240), and, The distance between the outlet of the Laval nozzle (240) and the wind tunnel entrance (110) satisfies: L=D / 5~D / 2, where L is the distance between the outlet of the Laval nozzle (240) and the wind tunnel entrance (110), and D is the length of the wind tunnel body (100) in the axial direction; The ice particle preparation assembly (200) further comprises an air intake section (250), the air intake section (250) being located between the outlet of the air intake channel (210), the outlet of the liquid intake channel (220) and the inlet of the Laval nozzle (240), and the atomizer (230) being located at the inlet of the air intake section (250), and the air intake section (250) and the Laval nozzle (240) being detachably connected; The icing wind tunnel test system further comprises a measuring component (400), wherein the measuring component (400) is located between the outlet of the Laval nozzle (240) and the wind tunnel outlet (120), and the measuring component (400) is used to measure the particle size of ice particles on a cross section of the wind tunnel body (100). The measuring assembly (400) comprises a particle size analyzer (410), a beam splitter (420) and a receiver (430); the particle size analyzer (410) and the beam splitter (420) are close to a first side wall (130) of the wind tunnel body (100); the receiver (430) is close to a second side wall (140) of the wind tunnel body (100); the first side wall (130) and the second side wall (140) are arranged opposite to each other; and the beam splitter (420) is located on a propagation path of light emitted by the particle size analyzer (410); the beam splitter (420) is used to disperse the laser light emitted by the particle size analyzer (410) into multiple beams; and the receiver (430) is used to receive the multiple beams of light dispersed by the beam splitter (420).

2. The icing wind tunnel test system according to claim 1, characterized in that: It also includes a straightening net (300), wherein the straightening net (300) is located at the wind tunnel entrance (110).

3. The icing wind tunnel test system according to claim 2, characterized in that: When the wind tunnel body (100) is cylindrical, the inner diameter of the wind tunnel body (100) is D / 5 to D / 3; Alternatively, when the wind tunnel body (100) is a rectangular parallelepiped, the height and width of the wind tunnel body (100) are both D / 5 to D / 3.

4. The icing wind tunnel test system according to claim 3, characterized in that: When the air intake section (250) is cylindrical, the inner diameter of the air intake section (250) is D / 40 to D / 12, and the axial length of the air intake section (250) is greater than or equal to D / 12; Alternatively, when the air intake section (250) is a rectangular parallelepiped, the height and width of the air intake section (250) are both D / 40 to D / 12, and the axial length of the air intake section (250) is greater than or equal to D / 12.

5. The icing wind tunnel test system according to claim 3, characterized in that: The ice particle preparation assembly (200) further comprises a pressure sensor (260) and a temperature sensor (270), wherein the pressure sensor (260) and the temperature sensor (270) are located at the air intake section (250).

6. The icing wind tunnel test system according to any one of claims 1 to 5, characterized in that: The length of the beam splitter (420) is equivalent to the height of the wind tunnel body (100); and / or, The beam splitter (420) and the particle size analyzer (410) are arranged at a distance from each other, and the distance between the beam splitter (420) and the particle size analyzer (410) is 1 to 3 cm.

7. The icing wind tunnel test system according to claim 6, characterized in that: The measurement component (400) further comprises a plurality of mechanical shutters (440), the number of the mechanical shutters (440) being the same as the light beams dispersed by the beam splitter (420), the mechanical shutters (440) being located on the propagation path of each light beam, and the plurality of mechanical shutters (440) being opened in sequence.

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