A balance water-cooling support device for wind tunnel test

Abstract

This invention discloses a water-cooled support device for a balance used in wind tunnel testing, comprising: a water-cooled jacket, a rear section, a water-cooled pipe, and a balance support rod; the water-cooled jacket is connected to the rear section; the balance support rod is located inside the water-cooled jacket; wherein, one end of the balance support rod is used to mount the balance, and the other end is connected to the rear section; one end of the water-cooled pipe passes through the rear end and connects to the water-cooled jacket. This invention aims to solve the problem of the temperature effect caused by high-temperature airflow affecting the accuracy of balances in hypersonic wind tunnels, and to achieve the goal of maintaining the balance at a normal temperature in high-temperature hot airflow.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel testing technology, and particularly relates to a water-cooled support device for a balance used in wind tunnel testing. Background Technology

[0002] In hypersonic wind tunnel testing, the temperature effect of the wind tunnel balance induced by high-temperature hot airflow has always been a significant factor limiting the performance of hypersonic wind tunnel force measurement tests. Taking Mach 8 as an example, the total temperature of the incoming flow reaches approximately 500°C. Although the balance is located inside the model cavity during the wind tunnel test, a gap is typically left between the model and the support rods to ensure sufficient space for deformation to achieve strain-based measurements. This gap allows the high-temperature hot airflow to enter the model cavity and generate convective heat transfer with the balance. Furthermore, the model and support rods, being directly exposed to the hot airflow, rapidly heat up and further transfer heat to the balance. Currently, a heat insulation sleeve is generally installed between the model and the balance to alleviate the heat transfer level of the model; however, due to the connection method between the balance and the support rods, the heat insulation sleeve cannot be applied. The convective heat transfer of the hot airflow and the heat transfer from the support rods induce a temperature effect on the balance, causing it to produce additional output and severely affecting the accuracy of the test results.

[0003] Currently, the most direct method for addressing the temperature effect of balances is to perform corresponding data correction based on temperature. However, this method is challenging and lacks precision. The primary reason is that the balance's temperature output is directly related to both the ambient temperature and its own temperature gradient. Developing a precise data correction method would require completely simulating the wind tunnel testing environment during the calibration phase, which is extremely difficult to achieve. Furthermore, the temperature output of balances varies significantly across different temperature ranges, making the development of a universal temperature correction method a challenge in itself. Therefore, a more reliable approach is to employ active thermal insulation technology to ensure the balance operates at room temperature during testing, eliminating additional temperature differences. Summary of the Invention

[0004] The technical problem solved by the present invention is to overcome the shortcomings of the prior art and provide a water-cooled support device for a balance used in wind tunnel tests. The aim is to solve the problem that the balance in the current hypersonic wind tunnel is affected by the temperature effect caused by the high temperature airflow, which affects the test accuracy, and to achieve the purpose of keeping the balance at room temperature in the high temperature hot airflow.

[0005] To solve the above-mentioned technical problems, the present invention discloses a water-cooled support device for a balance used in wind tunnel testing, comprising: a water-cooled jacket, a rear section, a water-cooled pipe, and a balance support rod;

[0006] The water-cooling jacket is connected and installed with the rear section;

[0007] The balance support rod is located inside the water-cooling jacket; one end of the balance support rod is used to mount the balance, and the other end is connected to the rear section.

[0008] One end of the water-cooling pipe is inserted from the rear end and connected to the water-cooling jacket.

[0009] In the aforementioned balance water-cooled support device for wind tunnel testing, the water-cooled pipe includes: an inlet pipe for water intake and a return pipe for water return; wherein, one end of the inlet pipe and the return pipe are connected to the water-cooled jacket, and the other end is led out from the rear section.

[0010] In the aforementioned water-cooled support device for wind tunnel testing, the water-cooled jacket includes: a water-cooled outer jacket, a water-cooled inner jacket, and a plug; wherein, the water-cooled outer jacket is located outside the water-cooled inner jacket; the rear end of the water-cooled outer jacket is radially machined with an inlet hole and an outlet hole; the inlet hole is connected to one end of an axial inlet pipe, and any excess process holes are blocked by a plug; the outlet hole is connected to one end of an axial return pipe, and any excess process holes are blocked by a plug; after installation, the plug is directly welded to the water-cooled outer jacket.

[0011] In the aforementioned balance water-cooled support device for wind tunnel testing, the interior of the water-cooled jacket is a smooth through-hole structure, and the exterior is a variable cross-section rotating body structure. The front end of the variable cross-section rotating body structure is a straight cylindrical section with a diameter of D1, which serves as the outer surface of the tail support for the wind tunnel test. The rear end of the variable cross-section rotating body structure is a cylindrical section with a diameter of D2, which is used to connect the water-cooling pipe. The front and rear ends of the variable cross-section rotating body structure are connected by a conical transition to achieve the rectification effect in the flow field of the wind tunnel test. D1 < D2.

[0012] In the aforementioned water-cooled support device for wind tunnel testing, the water-cooled inner sleeve is a cylindrical structure with a smooth through-hole inside. The front end and rear end of the water-cooled inner sleeve near the balance maintain a cylindrical shape. A double rectangular thread is machined between the front and rear ends of the water-cooled inner sleeve. The starting points of the two rectangular threads both originate from the rear end of the water-cooled inner sleeve and are distributed at 180°. The pitch of the two rectangular threads is equal, and the outer side of the threads is at the same height as the cylindrical surfaces at both ends of the water-cooled inner sleeve. The two rectangular threads extend to a distance of half a pitch from the cylindrical surface at the front end of the water-cooled inner sleeve and then stop. Two separate flow channels are formed inside the double rectangular threads: an inlet flow channel and an outlet flow channel. The two flow channels connect at the front end of the water-cooled inner sleeve as the double rectangular threads end, and the rest of the parts are completely separate.

[0013] In the aforementioned balance water-cooled support device used for wind tunnel testing, the inner diameter of the water-cooled outer jacket is interference-fitted with the thread of the water-cooled inner sleeve and the cylindrical surfaces at both ends of the water-cooled inner sleeve, and is welded on both end faces to form an integral whole with internal water flow channels; the water inlet and outlet of the water-cooled outer jacket are respectively aligned with the middle of the double rectangular thread to ensure smooth water inlet and outlet.

[0014] In the aforementioned water-cooled support device for a balance used in wind tunnel testing, the rear section is used to install the support device onto the angle-of-attack mechanism of the wind tunnel: the rear section is installed into a through hole of equal length to the angle-of-attack mechanism via a cylindrical surface, and a locking nut is installed at the tail end for fixation; the rear section contains a through hole for leading out the external lead wires of the balance and the water-cooling pipe; the rear section has two parallel reference planes on the cylindrical section for placing a level to adjust the angle of the balance support system; the front end of the rear section is a boss structure, with a stepped hole for connecting the balance support rod and a through hole for the water-cooling pipe to pass through.

[0015] In the aforementioned balance water-cooled support device used for wind tunnel testing, the inlet and outlet water pipes have the same structure, including: threaded joints, copper pipes, and pipe fittings; wherein, the threaded joints, copper pipes, and pipe fittings are welded together as one unit; the threaded joints and pipe fittings are respectively located at both ends of the copper pipes; the threaded joints are installed to the inlet or outlet of the water-cooled jacket through threads; the copper pipes are standard parts and their length can be adjusted according to the installation requirements of the wind tunnel; the pipe fittings are connected to the water supply equipment on the wind tunnel floor.

[0016] In the aforementioned water-cooled support device for a balance used in wind tunnel testing, the balance support rod is a column structure; the outer diameter of the balance support rod is larger than the diameter of the balance and equal to the inner diameter of the water-cooled inner sleeve, so as to leave a deformation gap for the balance; the balance support rod has through holes inside, which are used to lead out the external lead wires of the balance.

[0017] In the aforementioned water-cooled support device for a balance used in wind tunnel testing, the outer diameter of the balance support rod is 4-5 mm larger than the diameter of the balance, the inner diameter of the through hole in the balance support rod is 5 mm, and the outer diameter of the through hole in the balance support rod and the inner diameter of the water-cooled inner sleeve are in a sliding fit.

[0018] The present invention has the following advantages:

[0019] (1) This invention discloses a water-cooled support device for a balance used in wind tunnel tests. It can achieve a cooling effect without contacting the balance, thus eliminating the interference of measurement results caused by water flow affecting the stiffness of the balance in traditional water-cooled balances. The balance does not need to consider the limitation of water cooling during calibration, making it convenient to use.

[0020] (2) This invention discloses a water-cooled support device for a balance used in wind tunnel testing. It can eliminate the convective heat transfer between hot airflow and balance without affecting the normal deformation and measurement of the balance, and eliminate the heat transfer from the balance support rod to the balance, so as to keep the balance at room temperature and improve the accuracy of wind tunnel testing.

[0021] (3) This invention discloses a water-cooled support device for a balance used in wind tunnel testing. Balances with the same external dimensions can be used interchangeably, which is highly versatile.

[0022] (4) This invention discloses a water-cooled support device for a balance used in wind tunnel testing, which has a good cooling effect on the balance and high test accuracy. Attached Figure Description

[0023] Figure 1 This is an assembly diagram of a balance water-cooled support device and a balance according to an embodiment of the present invention;

[0024] Figure 2 for Figure 1 AA section view;

[0025] Figure 3 for Figure 2 A magnified view of a portion of region B in the middle;

[0026] Figure 4 for Figure 1 BB section view;

[0027] Figure 5 This is a perspective view of a water-cooled inner sleeve according to an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments disclosed in the present invention will be described in further detail below with reference to the accompanying drawings.

[0029] One of the core ideas of this invention is to disclose a water-cooled support device for a balance used in wind tunnel testing. Based on a double-threaded water-cooling circulation method, a water-cooled jacket is formed on the outside of the balance, so that the balance is kept at room temperature during wind tunnel testing. This enables the balance to be supported and cooled in high-temperature environments during wind tunnel testing, thereby improving the testing accuracy in hypersonic environments.

[0030] like Figure 1 and Figure 2 In this embodiment, the water-cooled support device for the balance used in wind tunnel testing includes: a water-cooled jacket 2, a rear section 3, a water-cooled pipe 4, and a balance support rod 5. The water-cooled jacket 2 is connected to the rear section 3; the balance support rod 5 is located inside the water-cooled jacket 2; one end of the balance support rod 5 is used to mount the balance 1, and the other end is connected to the rear section 3; one end of the water-cooled pipe 4 passes through the rear section 3 and connects to the water-cooled jacket 2.

[0031] In this embodiment, as Figure 3 The water-cooled pipe 4 specifically includes an inlet pipe 401 for water intake and a return pipe 402 for water return. One end of the inlet pipe 401 and the return pipe 402 are connected to the water-cooled jacket 2, and the other end extends from the rear section 3. It should be noted that the inlet pipe 401 and the return pipe 402 have identical structures and can be used interchangeably.

[0032] In this embodiment, as Figure 3 and Figure 4 The water-cooling jacket 2 specifically includes: a water-cooling outer jacket 21, a water-cooling inner jacket 22, and a plug 23. The water-cooling outer jacket 21 is located outside the water-cooling inner jacket 22. The rear end of the water-cooling outer jacket 21 has a radially machined inlet hole 221 and an outlet hole 222. The inlet hole 221 is connected to one end of an axially aligned inlet pipe 401, and any excess process holes are blocked by the plug 23. The outlet hole 222 is connected to one end of an axially aligned return pipe 402, and any excess process holes are blocked by the plug 23. After installation, the plug 23 is directly welded to the water-cooling outer jacket 21.

[0033] Preferably, the interior of the water-cooled jacket 21 has a smooth through-hole structure, and its exterior is a variable cross-section rotating body structure. The front end of the variable cross-section rotating body structure is a straight cylindrical section with a diameter of D1, serving as the outer surface of the tail support for the wind tunnel test; the rear end of the variable cross-section rotating body structure is a cylindrical section with a diameter of D2, used to connect the water-cooled pipe 4; the front and rear ends of the variable cross-section rotating body structure are connected by a conical transition surface to achieve a flow rectification effect in the wind tunnel test flow field; D1 < D2.

[0034] Preferred, such as Figure 5 The water-cooled inner sleeve 22 is a cylindrical structure with a smooth through hole inside. The front end of the water-cooled inner sleeve 22 near the balance 1 and the rear end near the rear section 3 both maintain a cylindrical shape. A double rectangular thread is machined between the front and rear ends of the water-cooled inner sleeve 22. The starting point of the two rectangular threads is from the rear end of the water-cooled inner sleeve 22 and they are distributed at 180°. The pitch of the two rectangular threads is equal, and the outer side of the thread is at the same height as the cylindrical surface at both ends of the water-cooled inner sleeve 22. The two rectangular threads continue to extend until they stop half a pitch away from the cylindrical surface at the front end of the water-cooled inner sleeve 22. Two separate flow channels are formed inside the double rectangular threads: an inlet flow channel and an outlet flow channel. The two flow channels are connected at the front end of the water-cooled inner sleeve 22 as the double rectangular threads end, and the rest of the parts are completely separated.

[0035] Preferably, the inner diameter of the water-cooled outer casing 21 is interference-fitted with the thread of the water-cooled inner casing 22 and the cylindrical surfaces at both ends of the water-cooled inner casing 22, and is welded on both end faces to form an integral whole with internal water flow channels; the water inlet hole 221 and the water outlet hole 222 of the water-cooled outer casing 21 are respectively aligned with the middle of the double rectangular thread to ensure smooth water inlet and outlet.

[0036] In this embodiment, the rear section 3 is used to install the support device onto the angle-of-attack mechanism of the wind tunnel: the rear section 3 is installed into a through hole of equal length to the angle-of-attack mechanism via a cylindrical surface, and a locking nut is installed at the tail end for fixation. The rear section 3 contains a through hole for leading out the external lead wire of the balance 1 and the water-cooling pipe 4. The rear section 3 has two parallel reference planes on the cylindrical section for placing a level to adjust the angle of the balance support system. The front end of the rear section 3 is a boss structure, with a stepped hole for connecting the balance support rod 5 and a through hole for the water-cooling pipe 4 to pass through.

[0037] In this embodiment, as described above, the inlet pipe 401 and the return pipe 402 have the same structure, specifically including: a threaded connector 41, a copper pipe 42, and a pipe fitting. The threaded connector 41, the copper pipe 42, and the pipe fitting are welded together as a single unit; the threaded connector 41 and the pipe fitting are respectively located at both ends of the copper pipe 42; the threaded connector 41 is installed to the inlet hole 221 or outlet hole 222 of the water-cooled jacket 21 via threads; the copper pipe 42 is a standard part, and its length can be adjusted according to the installation requirements of the wind tunnel; the pipe fitting is connected to the water supply equipment on the wind tunnel floor.

[0038] In this embodiment, the balance support rod 5 is a column structure; the outer diameter of the balance support rod 5 is larger than the diameter of the balance 1 and equal to the inner diameter of the water-cooled inner sleeve 22, so as to leave a deformation gap for the balance 1; the balance support rod 5 has a through hole inside, which is used to lead out the external lead wire of the balance 1.

[0039] Preferably, the outer diameter of the balance support rod 5 is 4-5 mm larger than the diameter of the balance 1, the inner diameter of the through hole of the balance support rod 5 is 5 mm, and the outer diameter of the through hole of the balance support rod 5 and the inner diameter of the water-cooled inner sleeve 22 are in a sliding fit.

[0040] In this embodiment, after the balance support rod 5 and the rear section 3 are installed in place through the cylindrical surface and the stepped surface, they can be further positioned by drilling pin holes in the circumferential direction of the cylindrical surface, or they can be directly spot-welded to the outside of the installation mating surface. After the water-cooling jacket 2 and the rear section 3 are installed in place through the cylindrical surface and the stepped surface, locking screws are installed to fix the water-cooling jacket 2 to the rear section 3.

[0041] In this embodiment, after the balance water-cooled support device is manufactured, two components are obtained for use together. Component one is a water-cooled circulation component that integrates the water-cooled jacket 2 and the water-cooled pipe 4. Component two is a balance support component composed of the rear section 3 and the balance support rod 5.

[0042] In this embodiment, during the actual installation process, the balance 1 and the balance support rod 5 are first installed. After installation, the water-cooling sleeve 2 is put on from the head of the balance backward. During the installation process, the water-cooling pipe 4 needs to be passed through the hole of the rear section 3 first. Then, the cylindrical surface of the water-cooling inner sleeve 22 is matched with the cylindrical surface of the balance support rod 5 and pushed into place by sliding fit. Finally, the locking screw is installed.

[0043] In this embodiment, the working principle of the water-cooled support device for wind tunnel testing is as follows:

[0044] 1) The water-cooling jacket consists of two parts: an inner water-cooling jacket and an outer water-cooling jacket. After machining, they are installed with an interference fit and welded together at both ends. The water-cooling jacket does not come into contact with the balance. The balance is merely mounted on the balance support rod. A deformation clearance is left between the balance and the water-cooling jacket, so the measurement of the balance is not affected by the water-cooling jacket.

[0045] 2) The double rectangular thread structure has one end for water inlet and the other end for water outlet. The water inlet starts from the end of the flow channel of the two rectangular threads, flows to the front end, mixes and enters the other flow channel, and flows back in the opposite direction. If a certain water pressure is maintained at the water inlet end, a continuous water circulation can be generated inside the water-cooled jacket, which will carry away the heat of the balance rod and hot air flow at any time.

[0046] In summary, this invention discloses a water-cooled support device for a balance used in wind tunnel testing. It effectively eliminates the temperature effect of the balance in hypersonic environments without interfering with normal balance measurements, thereby improving the accuracy of experimental measurements. This device is highly versatile and can be directly applied to insulation requirements in other similar applications.

[0047] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

[0048] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A water-cooled support device for a balance used in wind tunnel testing, characterized in that, include: Water cooling jacket (2), rear section (3), water cooling pipe (4) and balance support rod (5); The water-cooled jacket (2) is connected and installed with the rear section (3); The balance support rod (5) is located inside the water-cooling jacket (2); one end of the balance support rod (5) is used to install the balance (1), and the other end is connected to the rear section (3); One end of the water-cooled pipe (4) is inserted from the rear end (3) and connected to the water-cooled jacket (2); The water-cooled jacket (2) includes: a water-cooled outer jacket (21), a water-cooled inner jacket (22), and a plug (23); wherein, the water-cooled outer jacket (21) is located outside the water-cooled inner jacket (22); the rear end of the water-cooled outer jacket (21) is radially machined with a water inlet hole (221) and a water outlet hole (222); the water inlet hole (221) is connected to one end of the axial water inlet pipe (401), and the excess process hole is blocked by the plug (23); the water outlet hole (222) is connected to one end of the axial water return pipe (402), and the excess process hole is blocked by the plug (23); the plug (23) is directly welded to the water-cooled outer jacket (21) after installation; The interior of the water-cooled jacket (21) is a smooth through-hole structure, and the exterior is a variable cross-section rotating body structure; the front end of the variable cross-section rotating body structure is a straight cylindrical section with a diameter of D1, which serves as the outer surface of the tail support for the wind tunnel test; the rear end of the variable cross-section rotating body structure is a cylindrical section with a diameter of D2, which is used to connect the water-cooled pipe (4); the front and rear ends of the variable cross-section rotating body structure are connected by a conical transition to achieve the rectification effect in the flow field of the wind tunnel test; D1 < D2; The water-cooled inner sleeve (22) is a cylindrical structure with a smooth through hole inside. The front end of the water-cooled inner sleeve (22) near the balance (1) and the rear end near the rear section (3) both maintain a cylindrical shape. A double rectangular thread is machined between the front end and the rear end of the water-cooled inner sleeve (22). The starting point of the two rectangular threads is from the rear end of the water-cooled inner sleeve (22) and they are distributed at 180°. The pitch of the two rectangular threads is equal, and the outer side of the thread is at the same height as the cylindrical surface at both ends of the water-cooled inner sleeve (22). The two rectangular threads extend until they stop at half a pitch away from the cylindrical surface at the front end of the water-cooled inner sleeve (22). Two separate flow channels are formed inside the double rectangular threads: an inlet flow channel and an outlet flow channel. The two flow channels are connected at the front end of the water-cooled inner sleeve (22) along with the end of the double rectangular threads, and the rest of the parts are completely separated. The inner diameter of the water-cooled jacket (21) is interference-fitted with the thread of the water-cooled inner sleeve (22) and the cylindrical surfaces at both ends of the water-cooled inner sleeve (22), and welded on both end faces to form an integral body with an internal water flow channel; the water inlet (221) and water outlet (222) of the water-cooled jacket (21) are respectively aligned with the middle of the double rectangular thread to ensure smooth water inlet and outlet; The rear section (3) is used to install the support device onto the angle-of-attack mechanism of the wind tunnel: the rear section (3) is installed into the through hole of the same length as the angle-of-attack mechanism through the cylindrical surface, and a locking nut is installed at the tail to fix it; the rear section (3) contains a through hole for leading out the external lead wire of the balance (1) and the water cooling pipe (4); the rear section (3) has two parallel reference planes on the cylindrical section for placing a level to adjust the angle of the balance support system; the front end of the rear section (3) is a boss structure, and the boss is provided with a stepped hole for connecting the balance support rod (5) and a through hole for passing through the water cooling pipe (4); The balance support rod (5) is a column structure; the outer diameter of the balance support rod (5) is greater than the diameter of the balance (1) and equal to the inner diameter of the water-cooled inner sleeve (22) to allow for deformation clearance of the balance (1); the balance support rod (5) has a through hole inside, which is used to lead out the outer lead wire of the balance (1).

2. The water-cooled support device for a balance used in wind tunnel testing according to claim 1, characterized in that, The water-cooled pipe (4) includes: an inlet pipe (401) for water intake and a return pipe (402) for water return; wherein, one end of the inlet pipe (401) and the return pipe (402) are connected to the water-cooled jacket (2), and the other end is led out from the rear section (3).

3. The water-cooled support device for a balance used in wind tunnel testing according to claim 2, characterized in that, The inlet pipe (401) and the return pipe (402) have the same structure, including: threaded connector (41), copper pipe (42) and pipe fitting; wherein, the threaded connector (41), copper pipe (42) and pipe fitting are connected as one piece by welding; the threaded connector (41) and pipe fitting are respectively set at both ends of the copper pipe (42); the threaded connector (41) is installed to the water inlet hole (221) or water outlet hole (222) of the water-cooled jacket (21) by thread; the copper pipe (42) is a standard part and its length can be adjusted according to the installation requirements of the wind tunnel; the pipe fitting is connected to the water supply equipment on the ground of the wind tunnel.

4. The water-cooled support device for a balance used in wind tunnel testing according to claim 3, characterized in that, The outer diameter of the balance support rod (5) is 4-5 mm larger than the diameter of the balance (1). The inner diameter of the through hole of the balance support rod (5) is 5 mm. The outer diameter of the through hole of the balance support rod (5) and the inner diameter of the water-cooled inner sleeve (22) are in a sliding fit.

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