Ice wind tunnel cloud particle measuring device

Abstract

The ice wind tunnel cloud and mist particle measuring device is suitable for testing an incoming flow cloud and mist field in a wind tunnel test section, a first hole and a second hole are formed in corresponding positions of two side faces in the length direction of the wind tunnel test section, and the ice wind tunnel cloud and mist particle measuring device comprises a first shell, a second shell and a controller, a first cylinder is arranged in the center area of the first shell, a second cylinder is arranged in the center area of the second shell, the first cylinder and the second cylinder are each of a hollow structure with the two ends open, laser beams are scattered after irradiating an incoming flow cloud field, water drops of the irradiated part in the cloud field shield laser to form projection, and a projection image is shot by the camera and fed back to the controller; and the detection is completed by the controller, so that the detection or test efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the technical field of wind tunnel testing equipment, and particularly relates to a device for measuring cloud and fog particles in an ice wind tunnel. Background Technology

[0002] During ice wind tunnel and rain wind tunnel tests, the particle size distribution of cloud and fog droplets needs to be controlled and adjusted according to the target test conditions. Under supercooled water / ice crystal / mixed test conditions, the morphology and particle size distribution of water droplets and ice crystals need to be distinguished and confirmed.

[0003] Existing methods for detecting cloud and fog particles in wind tunnels, such as CN111024560B "Cloud and Fog Particle Collector", CN112903547B "High-Concentration Cloud and Fog Particle Concentration Measurement Device Based on Dual Light Source", and CN116046617A "A High-Precision Measurement Device and Method for Dual-Field Wide-Range Particle Size in High-Speed ​​Cloud and Fog Fields", typically involve installing airborne cloud and fog particle measurement equipment inside the wind tunnel test section. Each adjustment of cloud and fog particle size requires repeated disassembly and reassembly of the test product and the cloud and fog particle measurement equipment within the test section, significantly extending the test cycle and affecting the overall efficiency of the wind tunnel. Furthermore, due to the inherent size limitations of the cloud and fog particle measurement device, its installation inside a small-sized wind tunnel can easily lead to increased blockage, making it difficult to achieve the target wind speed when the target wind speed is high, thus affecting the validity of the measurement results and reducing test efficiency.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The ice wind tunnel cloud and fog particle measuring device provided by this invention solves the technical problem of low experimental efficiency caused by existing methods. The technical solution of this invention has many beneficial effects, as described below: A wind tunnel cloud particle measuring device is suitable for testing incoming cloud fields in a wind tunnel test section. The wind tunnel test section has a first hole and a second hole at corresponding positions on two sides along its length. The device includes a hollow first shell and a second shell, and a controller. A first cylinder is located in the central region of the first shell, and a second cylinder is located in the central region of the second shell. Both the first and second cylinders are hollow and open at both ends. A pulsed laser is rotatably mounted inside the first housing. A focusing lens is installed at the emission port of the pulsed laser. The laser beam, after being focused by the focusing lens, is emitted through a first cylinder to irradiate the incoming cloud and fog field. The first cylinder is installed in a first hole, and the second cylinder is installed in a second hole. A camera is installed inside the second housing, and a receiving lens group is installed at the port of the second cylinder. After the laser beam irradiates the incoming cloud field, it is scattered. The water droplets in the irradiated part of the cloud field block the laser to form a projection. The projected image is captured by the camera and fed back to the controller, which completes the detection.

[0006] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: The use of a first and second housing reduces space occupancy and avoids obstruction when installed inside a small-sized ice wind tunnel. In particular, it ensures that the target wind speed can be achieved when the test target wind speed is high, without affecting the validity of the measurement results. It can measure the characteristics of cloud and fog particles in real time during product testing and can achieve full wind speed conditions in a small ice wind tunnel. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0008] Figure 1 This is a schematic view of the wind tunnel test section; Figure 2 This is a schematic diagram of the first and second housings, wherein, 1. Wind tunnel test section; 11. First hole; 12. Second hole; 21. First shell; 211. First cylinder; 22. Second shell; 221. Second cylinder. Detailed Implementation

[0009] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0010] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this invention, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0011] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0012] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that aspects can be practiced without these specific details. To enable those skilled in the art to better understand the invention, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, unless otherwise stated, "a plurality of" means two or more.

[0013] like Figures 1 to 2 The ice wind tunnel cloud and fog particle measuring device shown is suitable for testing the incoming cloud and fog field in wind tunnel test section 1. The wind tunnel test section 1 has a first hole 11 and a second hole 12 at corresponding positions on two sides along its length. It includes a hollow first shell 21 and a hollow second shell 22, and a controller. A first cylinder 211 is located in the central region of the first shell 21, and a second cylinder 221 is located in the central region of the second shell 22. Both the first cylinder 211 and the second cylinder 221 are hollow and open at both ends. A pulsed laser is rotatably mounted inside the first housing 21. A focusing lens is installed at the emission port of the pulsed laser. The laser beam, after being focused by the focusing lens, is emitted through the first cylinder 211 to irradiate the incoming cloud field. The first cylinder 211 is installed in the first hole 11, and the second cylinder 221 is installed in the second hole 12. A camera is installed inside the second housing 22, and a receiving lens group is installed at the port of the second cylinder 221. After the laser beam irradiates the incoming cloud field, it is scattered. The water droplets in the irradiated part of the cloud field block the laser to form a projection. The projected image is captured by the camera and fed back to the controller, which completes the detection.

[0014] In one embodiment, a PTC heater is installed on the inner ring surface of the first cylinder 211 to prevent the focusing lens from icing and fogging. A PTC heater is installed on the inner ring surface of the second housing 22 to prevent the receiving lens group (flat lens group) from icing and fogging. Preferably, the camera has a built-in function of filtering sensitive light.

[0015] In one instance, the detection performed by the controller includes determining that if the shape formed by the pixels in the projected image is a circle or an ellipse, it is a water droplet; if it is a polygon or an irregular shape, it is an ice crystal. The detection is performed based on the diameter of the water droplets and ice crystals. Specifically, S1: The detection is completed based on the diameter of the water droplet, including... Calculate the projected area S1 of each water droplet = S_transfer * N1 / X * Y, where X is the number of horizontal pixels of the camera, Y is the number of vertical pixels of the camera, and N1 is the number of projected pixels of the water droplet. Calculate the diameter D1 of all water droplets based on the projected area S1 of all water droplets. Select water droplets within a first preset diameter range (e.g., 10 micrometers to 50 micrometers) from all diameters D1, and count the number N. Calculate the percentage of the number N to the total number of water droplets. If the measured percentage is within the standard percentage range, the water droplet test is deemed qualified.

[0016] S2: The detection is completed based on the diameter of the ice crystals, including... Calculate the projected area of ​​the ice crystal S2 = Stransfer * N2 / X * Y, where X is the number of horizontal pixels of the camera, Y is the number of vertical pixels of the camera, and N2 is the number of projected pixels of the ice crystal. The diameter D2 is calculated by treating the ice crystal as a sphere. Ice crystals within a second preset diameter range (selected according to the test model or parameters, etc.) from all diameters D2 are counted, and the number K is recorded. Calculate the percentage of ice crystals K relative to the total number of ice crystals. If the percentage of ice crystals measured is within the range of the standard percentage of ice crystals, the ice crystal test is deemed qualified.

[0017] Measurement results are directly output digitally, saving the manual input of measurement and calculation processes.

[0018] The product provided by this invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from the principles of the invention, and these improvements and modifications also fall within the protection scope of the invention claims.

Claims

1. An ice wind tunnel cloud mist particle measuring device, which is suitable for testing the incoming flow cloud mist field in a wind tunnel test section, characterized in that, The first hole and the second hole are opened on the two sides of the length direction of the wind tunnel test section at corresponding positions, and a first shell and a second shell provided with a hollow structure and a controller are arranged, a first cylinder is arranged in the central region of the first shell, a second cylinder is arranged in the central region of the second shell, and the first cylinder and the second cylinder are both arranged in a hollow structure with both ends open, A pulse laser is rotatably arranged in the first shell, and a focusing lens is arranged on the emission port of the pulse laser, the laser focused by the focusing lens is emitted through the first cylinder to irradiate the incoming flow cloud field, the first cylinder is arranged in the first hole, and the second cylinder is arranged in the second hole; A camera is arranged in the second shell, a receiving lens group is arranged on the port of the second cylinder, the laser beam is scattered after irradiating the incoming flow cloud field, the water droplets in the irradiated part of the cloud field shield the laser to form a projection, the projection image is captured by the camera and fed back to the controller, and detection is completed by the controller.

2. The ice wind tunnel cloud particle measurement apparatus according to claim 1, characterized by, A PTC heater is arranged on the inner ring surface of the first cylinder, and the PTC heater is used to prevent the focusing lens from icing and fogging.

3. The ice wind tunnel cloud particle measurement apparatus according to claim 1, characterized by, A PTC heater for preventing the receiving lens group from icing and fogging is arranged on the inner ring surface of the second shell.

4. The ice wind tunnel cloud particle measurement apparatus according to claim 1, characterized by, The detection completed by the controller includes, If the shape surrounded by the pixel points in the projection image is a circle or an ellipse, it is determined that the water droplets are determined, and if it is a polygon or an irregular shape, it is determined that the ice crystals are determined; The detection is completed according to the diameters of the water droplets and the ice crystals.

5. The ice wind tunnel cloud particle measurement apparatus according to claim 4, characterized by The detection according to the diameter of the water droplets includes, S1 = S 传 N1 / X * Y, where X is the number of horizontal pixels of the camera, Y is the number of vertical pixels of the camera, N1 is the number of water droplet projection pixels, S 传 is the total number of pixels of the camera; According to the projected area S1 of all water droplets, the diameter D1 of all water droplets is calculated ; Water droplets within a first preset diameter range are selected from all diameters D1, and the number N is counted; The measured percentage of the number N in all water droplets is calculated, and if the measured percentage is within the range of the standard percentage, the water droplet test is determined to be qualified.

6. The ice wind tunnel cloud particle measurement apparatus according to claim 5, wherein The detection according to the diameter of the ice crystals includes The projected area S2 of the ice crystal is calculated = S 传 N2 / X*Y, wherein X is the number of horizontal pixels of the camera, Y is the number of vertical pixels of the camera, and N2 is the number of ice crystal projected pixels. The ice crystals are considered as spheres to calculate the diameter D2 ; Ice crystals within a second preset diameter range are selected from all diameters D2, and the number K is counted; The ice crystal measured percentage of the number K in all ice crystals is calculated, and if the ice crystal measured percentage is within the range of the ice crystal standard percentage, the ice crystal test is determined to be qualified.

7. The ice wind tunnel cloud particle measurement apparatus according to claim 6, characterized by Observation windows are arranged on the two sides of the wind tunnel test section.

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