An observation window for infrared thermal imaging equipment in an ice wind tunnel

Abstract

The present invention relates to the technical field of wind tunnels, and discloses an observation window for infrared thermal imaging equipment of an ice wind tunnel, comprising an observation tube, which is obliquely arranged on an observation wall plate of the wind tunnel, and the far end of which extends into the wind tunnel; the observation tube has an observation channel that penetrates along its own axis; and an observation glass, which is arranged at the near end of the observation tube; wherein the observation tube is inclined toward one side of the front end of the wind tunnel. The present invention can solve the technical problem of easy fogging and icing of the observation glass in the related art through the above technical solution.

Description

Technical Field

[0001] The invention relates to the technical field of wind tunnels, and in particular to an observation window for infrared thermal imaging equipment of an icing wind tunnel. Background Art

[0002] Infrared thermal imaging temperature measurement has the advantages of fast measurement speed, large area, high resolution, non-contact, and no interference with the measured surface. It is a common non-contact temperature measurement technology and has a wide range of applications and important value in icing wind tunnels. The observation window material of the infrared thermal imager is usually made of high-transmittance infrared glass. Due to the low temperature and high humidity environment in the icing wind tunnel, the observation window is prone to fogging and ice during the test, which will directly lead to measurement failure. The fogging and icing problems of ordinary glass can usually be solved by electric heating and blowing hot air, while infrared glass uses electric heating and hot air to defog and de-ice, which will affect the surrounding temperature field and is restricted in its use in icing wind tunnels. When the infrared glass is fogged, it will affect the infrared thermal imager's observation of the object being measured, and there is currently no better method to defog and de-ice the infrared glass during the icing wind tunnel test.

[0003] Therefore, providing an observation window that is not prone to fogging and icing is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the invention

[0004] The invention discloses an observation window of an infrared thermal imaging device of an icing wind tunnel, so as to solve the technical problem that the observation glass in the related art is easy to fog and freeze.

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

[0006] An observation window for infrared thermal imaging equipment of an icing wind tunnel, comprising:

[0007] An observation tube is obliquely arranged on the observation wall plate of the wind tunnel, and the far end of the observation tube extends into the wind tunnel; the observation tube has an observation channel penetrating along its own axis;

[0008] An observation glass, arranged at the near end of the observation tube;

[0009] The observation tube is tilted toward one side of the front end of the wind tunnel.

[0010] In some aspects, the distal end of the observation tube is coplanar with the inner wall of the observation wall plate.

[0011] In some embodiments, the angle between the observation tube and one side of the front end of the wind tunnel is no greater than 40°.

[0012] In some schemes, the observation tube includes a first tube body and a second tube body, the distal end of the first tube body is obliquely disposed on the outer wall of the wind tunnel and extends into the wind tunnel, and the second tube body is connected to the first tube body and can move along the axial direction of the first tube body;

[0013] The sight glass is disposed at the proximal end of the second cylinder.

[0014] In some embodiments, the second cylinder has a connecting portion, an outer wall of which contacts an inner wall of the first cylinder and is movable along the axial direction of the first cylinder.

[0015] In some embodiments, the outer wall of the connecting portion is slidably connected to the inner wall of the first cylinder.

[0016] In some embodiments, the outer wall of the connecting portion is threadedly connected to the inner wall of the first cylinder.

[0017] In some solutions, the second cylinder further has a mounting portion, and a mounting space is formed between the mounting portion and the connecting portion, and the first cylinder is snap-connected in the mounting space.

[0018] In some solutions, the outer wall of the first cylinder is provided with a limiting groove, and the limiting groove extends along the axial direction of the first cylinder;

[0019] The inner wall of the mounting portion is provided with a limiting protrusion, which is clamped in the limiting groove; when the second cylinder moves to the maximum stroke, the limiting protrusion and the limiting groove stop.

[0020] In some embodiments, the viewing window is applied to a wind tunnel.

[0021] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0022] The observation window of the infrared thermal imaging equipment of the icing wind tunnel of the present application fixes the object to be measured in the wind tunnel and is located within the line of sight of the observation tube, and an infrared thermal imager is arranged outside the wind tunnel to observe the object to be measured in the wind tunnel. During the wind tunnel test, the airflow will carry water droplets and hit the object to be measured. Since the observation tube is tilted toward one side of the front end of the wind tunnel, the airflow will collide with the inner wall of the observation tube and change the flow trajectory, thereby forming an air vortex in the observation channel and forming a flow dead zone. The air vortex will block the water droplets from contacting the observation glass, preventing the water droplets from atomizing on the observation glass, thereby preventing the observation glass from fogging and freezing. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 It is a schematic diagram of the working state of the observation window of the present invention;

[0025] Figure 2 It is a partial axial view of the observation window of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of the observation window of the present invention. Figure 1 ;

[0027] Figure 4 yes Figure 3 The enlarged view of point A in the middle;

[0028] Figure 5 This is a schematic diagram of the structure of the observation window of the present invention. Figure 2 ;

[0029] Figure 6 yes Figure 5 Enlarged view of point B in the middle.

[0030] In the figure:

[0031] 100- wind tunnel, 110- observation wall panel;

[0032] 200-observation window, 210-observation tube, 211-first tube body, 2111-limiting groove, 212-second tube body, 2121-connecting part, 2122-installation part, 2123-installation space, 2124-limiting protrusion, 220-observation glass;

[0033] 300-Infrared thermal imager;

[0034] 400 - Object under test. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] In each embodiment of the present application, "proximal end" and "distal end" refer to the position of each component relative to the user in the use environment, wherein the end closer to the user is designated as the "proximal end" and the end farther from the user is designated as the "distal end".

[0038] The applicant found in use that when observing the object 400, water droplets easily contact the observation glass 220 of the existing wind tunnel 100 and fog up. The fogging and icing problems of ordinary glass can usually be solved by electric heating and blowing hot air, but the defogging and deicing of infrared glass by electric heating and blowing hot air will affect the surrounding temperature field, and the use of the infrared glass in the icing wind tunnel 100 is restricted. When the infrared glass is fogged, it will affect the observation of the object 400 by the infrared thermal imager 300, and there is currently no good method to defog the infrared glass during the wind tunnel test.

[0039] The following is combined with Figures 1 to 6 , an observation window of an icing wind tunnel infrared thermal imaging device provided by the present application is described in detail through specific embodiments and application scenarios.

[0040] Some embodiments of the present application provide an observation window for an infrared thermal imaging device in an icing wind tunnel, such as Figure 2 , Figure 3 and Figure 5 As shown, the observation window 200 includes an observation tube 210 and a viewing glass 220 .

[0041] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the observation tube 210 is tiltedly arranged on the observation wall plate 110 of the wind tunnel 100, and the far end extends into the wind tunnel 100, and has an observation channel running through along its own axis. The observation tube 210 is the main way for the outside world to observe the object 400 under test in the wind tunnel 100. Before the test, the object 400 under test is first installed in the wind tunnel 100 and is just located in the observation field of the observation tube 210. Then, an infrared thermal imager 300 is set up outside the wind tunnel 100, and the axis of the lens of the infrared thermal imager 300 is made to be colinear with the axis of the observation channel, and the object 400 under test in the wind tunnel 100 is detected through the observation channel. The infrared thermal imager 300 has the advantages of fast measurement speed, large area, high resolution, non-contact, and no interference with the measured surface. It can better detect the temperature distribution and changes of the object 400 under test, and provide important data support for the design and optimization of the object 400 under test.

[0042] It should be noted that the measured object 400 in this embodiment mainly refers to an aircraft. By using the wind tunnel 100 to study the icing characteristics of the aircraft surface, the influence of icing on aerodynamics, and icing protection, important data support is provided for aircraft design and modification.

[0043] It should also be noted that the size of the observation tube 210 is very small compared to the entire wind tunnel 100, and will not affect the flow of the fluid in the wind tunnel 100, and will not affect the uniformity of the flow field in the test section. For example, in this embodiment, the cross-sectional size of the wind tunnel 100 is 3m×2m, and the inner diameter of the observation tube 210 is 100mm. The size of the observation tube 210 is much smaller than the cross-sectional size of the wind tunnel 100, so it has a very small effect on the flow of the fluid in the wind tunnel 100.

[0044] It is natural that the inner diameter of the observation tube 210 may also be other sizes, and can be flexibly set according to usage requirements, and this embodiment does not limit this.

[0045] In this embodiment, the orthographic projection of the observation channel along its own axis is a circle. Compared with other shapes, the observation channel with a circular cross-section can provide a larger observation field of view, so that the infrared thermal imager 300 can better detect the object 400 under test.

[0046] like Figure 2 , Figure 3 and Figure 5 As shown, the observation glass 220 is disposed at the proximal end of the observation tube 210. The observation glass 220 in this embodiment refers to infrared glass, which has a higher transmittance to infrared radiation than other glasses, and can effectively transmit the infrared radiation energy emitted from the surface of the measured object 400 to the infrared thermal imager 300, thereby enabling the infrared thermal imager 300 to better detect the temperature distribution and changes of the measured object 400, and provide important data support for the design and optimization of the measured object 400.

[0047] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the observation tube 210 is tilted toward one side of the front end of the wind tunnel 100. Since the observation glass 220 in this embodiment is infrared glass, it cannot be defogged and de-iced by electric heating or blowing hot air. Therefore, the problem of fog and ice needs to be solved. The observation tube 210 is tilted toward one side of the front end of the wind tunnel 100, and the airflow will collide with the inner wall of the observation tube 210 and change the flow trajectory, thereby forming an air vortex in the observation channel and forming a flow dead zone. The air vortex will prevent water droplets from contacting the observation glass 220, preventing water droplets from atomizing on the observation glass 220, thereby preventing the observation glass 220 from fogging.

[0048] It should be noted that, along the flow direction of the airflow, the front end of the wind tunnel 100 refers to the position where the airflow just starts to flow.

[0049] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the angle between the observation tube 210 and one side of the front end of the wind tunnel 100 is no greater than 40°. By setting the inclination angle of the observation tube 210 and the front end of the wind tunnel 100 to no greater than 40°, the airflow needs to undergo a sharper turn when encountering the observation tube 210. This sharp turn will lead to an uneven distribution of the airflow velocity, especially on the inner side of the turn (i.e., the side close to the observation tube 210), the airflow velocity will slow down or even stagnate, while it may accelerate on the outer side. This speed difference is an important driving force for the generation of air vortices. At the same time, a sufficiently large recirculation zone can be formed to prevent water droplets from hitting the observation glass 220, thereby preventing the observation glass 220 from fogging and icing.

[0050] In some embodiments, the angle between the observation tube 210 and one side of the front end of the wind tunnel 100 is 10°.

[0051] In some embodiments, the angle between the observation tube 210 and one side of the front end of the wind tunnel 100 is 20°.

[0052] In some embodiments, the angle between the observation tube 210 and one side of the front end of the wind tunnel 100 is 30°.

[0053] In some embodiments, the angle between the observation tube 210 and one side of the front end of the wind tunnel 100 is 40°.

[0054] like Figure 3 and Figure 5 As shown, the distal end of the observation tube 210 is coplanar with the inner wall of the observation wall plate 110. The design of the observation tube 210 being coplanar with the observation wall plate 110 helps maintain the stability of the flow field in the wind tunnel 100. In the test of the wind tunnel 100, the stability of the flow field needs to be ensured. If the distal end of the observation tube 210 protrudes from the inner wall of the observation wall plate 110, the protruding part of the observation tube 210 will disturb the flow of the airflow, causing the airflow to be blocked, resulting in turbulence, and thus making the flow field unstable. The coplanar design avoids this problem, allowing the airflow to pass smoothly through the observation area, thereby maintaining the stability of the flow field.

[0055] like Figure 3 and Figure 5As shown, the observation tube 210 includes a first cylinder 211 and a second cylinder 212. The distal end of the first cylinder 211 is inclinedly disposed on the outer wall of the wind tunnel 100 and extends into the wind tunnel 100. The second cylinder 212 is connected to the first cylinder 211 and can move along the axial direction of the first cylinder 211. According to the wind speed and water content in the wind tunnel 100, the second cylinder 212 can be moved to change the length of the observation tube 210, thereby adjusting the size of the flow dead zone and changing the amount of air vortex in the flow dead zone.

[0056] When the wind speed and water content in the wind tunnel 100 are high, the second cylinder 212 can be moved upward to increase the length of the observation tube 210, so that more air vortices can be formed in the observation channel to prevent water droplets from contacting the observation glass 220. When the wind speed and water content in the wind tunnel 100 are low, the second cylinder 212 can be moved downward to reduce the length of the observation tube 210 to avoid excessive air vortices from forming in the observation channel.

[0057] It should be noted that the distal end of the observation tube 210 and the inner wall of the observation wall plate 110 being coplanar means that the distal end of the first tube body 211 and the inner wall of the observation wall plate 110 are coplanar.

[0058] It should also be noted that both the first cylinder 211 and the second cylinder 212 are hollow structures, thereby forming an observation channel for observing the interior of the wind tunnel 100 , and the observation glass 220 is disposed at the proximal end of the second cylinder 212 .

[0059] like Figure 4 and Figure 6 As shown, the second cylinder 212 has a connecting portion 2121, the outer wall of the connecting portion 2121 contacts the inner wall of the first cylinder 211, and can move along the axial direction of the first cylinder 211. By the way that the outer wall of the connecting portion 2121 contacts the inner wall of the first cylinder 211, an effective sealing interface is formed between the two. This close contact can effectively prevent the fluid from leaking out through the gap, thereby improving the sealing performance of the observation cylinder 210.

[0060] In some embodiments, Figure 3 and Figure 4 As shown, the outer wall of the connecting portion 2121 is slidably connected to the inner wall of the first cylinder 211. By pulling the second cylinder 212, the length of the observation tube 210 can be changed.

[0061] In some embodiments, Figure 5 and Figure 6 As shown, the outer wall of the connecting portion 2121 is threadedly connected to the inner wall of the first cylinder 211. By rotating the second cylinder 212, the length of the observation tube 210 can be changed.

[0062] like Figure 3-Figure 6As shown, the second cylinder 212 further has a mounting portion 2122 , and a mounting space 2123 is formed between the mounting portion 2122 and the connecting portion 2121 , and the first cylinder 211 is snap-fitted into the mounting space 2123 .

[0063] The connecting portion 2121 is located inside the mounting portion 2122, and a mounting space 2123 is formed between the outer wall of the connecting portion 2121 and the inner wall of the mounting portion 2122, and the projection of the mounting space 2123 along the axial direction of the observation tube 210 overlaps with the projection of the second cylinder 212 along its own axial direction. That is, when the first cylinder 211 is located inside the mounting space 2123, both the inner wall and the outer wall of the first cylinder 211 are in direct contact with the mounting space 2123, so that both the inner wall and the outer wall of the first cylinder 211 form an effective sealing interface, further improving the sealing performance of the observation tube 210.

[0064] like Figure 3-Figure 6 As shown, the outer wall of the first cylinder 211 is provided with a limiting groove 2111 , and the limiting groove 2111 extends along the axial direction of the first cylinder 211 ; the inner wall of the mounting portion 2122 has a limiting protrusion 2124 , and the limiting protrusion 2124 is snap-fitted into the limiting groove 2111 .

[0065] When the second cylinder 212 moves to the maximum stroke, the limiting protrusion 2124 abuts against the limiting groove 2111 , which can prevent the second cylinder 212 from falling off from the first cylinder 211 , thereby ensuring the reliability of the structure of the observation tube 210 .

[0066] It should be noted that, in this embodiment, the limiting protrusion 2124 is in the form of two half rings. During installation, the second cylinder 212 is first connected to the first cylinder 211, and then the two half rings of the limiting protrusion 2124 are fixed to the ends of the mounting portion 2122 by welding, clamping, etc., to complete the connection between the first cylinder 211 and the second cylinder 212.

[0067] It should also be noted that the length of the limiting groove 2111 can be flexibly set according to usage requirements, and this embodiment does not limit this.

[0068] Some embodiments of the present application provide a wind tunnel 100, such as Figure 1 As shown, the observation window 200 is applied to the wind tunnel 100 .

[0069] The wind tunnel 100 in this embodiment refers to an icing wind tunnel.

[0070] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0071] In addition, it should be noted 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 a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0072] 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 by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An observation window for infrared thermal imaging equipment of an icing wind tunnel, characterized in that: include: An observation tube, obliquely arranged on the observation wall plate of the wind tunnel, and with a far end extending into the wind tunnel; The observation tube has an observation channel penetrating along its axial direction; An observation glass, disposed at the proximal end of the observation tube; Wherein, the observation tube is inclined toward one side of the front end of the wind tunnel.

2. The observation window of the infrared thermal imaging device of an ice wind tunnel according to claim 1, characterized in that: The distal end of the observation tube is coplanar with the inner wall of the observation wall plate.

3. The observation window of an infrared thermal imaging device for an icing wind tunnel according to claim 1, characterized in that: The angle between the observation tube and one side of the front end of the wind tunnel is not greater than 40°.

4. The observation window of an infrared thermal imaging device for an icing wind tunnel according to claim 1, characterized in that: The observation tube comprises a first tube body and a second tube body, the distal end of the first tube body is obliquely arranged on the outer wall of the wind tunnel and extends into the wind tunnel, and the second tube body is connected to the first tube body and can move along the axial direction of the first tube body; The observation glass is disposed at the proximal end of the second cylinder.

5. The observation window of the infrared thermal imaging device of an ice wind tunnel according to claim 4, characterized in that: The second cylinder has a connecting portion, an outer wall of which contacts an inner wall of the first cylinder and is movable along an axial direction of the first cylinder.

6. The observation window of the infrared thermal imaging device of an ice wind tunnel according to claim 5, characterized in that: The outer wall of the connecting portion is slidably connected to the inner wall of the first cylinder.

7. The observation window of the infrared thermal imaging device of an ice wind tunnel according to claim 5, characterized in that: The outer wall of the connecting portion is threadedly connected to the inner wall of the first cylinder.

8. An observation window for infrared thermal imaging equipment of an icing wind tunnel according to claim 6 or 7, characterized in that: The second cylinder also has a mounting portion, and a mounting space is formed between the mounting portion and the connecting portion, and the first cylinder is clamped in the mounting space.

9. The observation window of the infrared thermal imaging device of an ice wind tunnel according to claim 8, characterized in that: The outer wall of the first cylinder is provided with a limiting groove, and the limiting groove extends along the axial direction of the first cylinder; The mounting portion has a limiting protrusion, and the limiting protrusion is clamped in the limiting groove; when the second cylinder moves to a maximum stroke, the limiting protrusion and the limiting groove stop.

10. The observation window of the infrared thermal imaging equipment of an ice wind tunnel according to claim 1, characterized in that: The observation window is applied to a wind tunnel.

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