A normal radiation temperature measurement window for high-frequency induction wind tunnel stagnation test

Abstract

This invention discloses a normal radiation temperature measurement window for high-frequency induction wind tunnel stagnation tests, relating to the field of radiation temperature measurement technology. It includes: an inlet flange, an outlet flange, and an air-cooling bolt. The inlet and outlet flanges are sealed together to form an annular water channel. The air-cooling bolt and outlet flange are sealed together to form an air-cooled chamber. Infrared glass is placed between the air-cooling bolt and the outlet flange and sealed together. The entire window is sealed to the tail of the high-frequency induction wind tunnel via the inlet flange to form a water-cooled chamber. The inlet flange, outlet flange, and air-cooling bolt each have a light-transmitting hole at their center. This window can cool the high-temperature gas and the infrared glass through water cooling and air cooling respectively, preventing the infrared glass from reducing its transmittance due to excessive temperature. This enables normal radiation temperature measurement in high-frequency induction wind tunnel stagnation tests, improving the accuracy of radiation temperature measurement.

Description

Technical Field

[0001] This invention relates to the technical field of radiation thermometry, and in particular to a normal radiation thermometry window for high-frequency induction wind tunnel stagnation tests. Background Technology

[0002] Radiation thermometry has wide applications in aerospace, materials science, metallurgy, and other fields due to its fast response, unlimited temperature measurement capacity, and non-contact nature. High-frequency induction wind tunnels are key testing equipment in aerospace aerodynamic thermal protection experiments, used to simulate the aerodynamic thermal environment during spacecraft reentry. Because the experiment must be conducted under sealed vacuum conditions, appropriate infrared windows must be used according to the different wavelengths required when measuring the model surface temperature using radiation thermometry equipment during high-frequency induction wind tunnel experiments. Summary of the Invention

[0003] This invention provides a normal radiation temperature measurement window for high-frequency induction wind tunnel stagnation tests. This window can cool the high-temperature gas and the infrared glass through water cooling and air cooling respectively, which can avoid the reduction of transmittance of the infrared glass due to excessive temperature, thereby realizing normal radiation temperature measurement in high-frequency induction wind tunnel stagnation tests and improving the accuracy of radiation temperature measurement.

[0004] In the first aspect, a normal radiation temperature measurement window for high-frequency induction wind tunnel stagnation test is provided, including an inlet flange assembly, an outlet flange assembly, an air-cooled bolt, and an infrared glass.

[0005] The water inlet flange assembly is used to connect to the tail of the high-frequency induction wind tunnel. The center of the water inlet flange body has a through-hole for light transmission, which is positioned opposite to the air-cooling bolt.

[0006] The inlet flange assembly includes an inlet flange body, a first inlet pipe, and a second inlet pipe; the inlet flange body includes a first inlet channel and a second inlet channel formed by a slot; the first inlet channel is connected to the first inlet pipe, and the second inlet channel is connected to the second inlet pipe.

[0007] The inlet flange body also includes a water cooling tank; the water cooling tank is annular and located in the center of the inlet flange body; the water cooling tank is located on the side of the inlet flange body away from the outlet flange assembly; the water cooling tank is connected to the first water inlet channel and the second water inlet channel, and the cooling water entering the water cooling tank is used to cool the hot airflow at the tail of the high-frequency induction wind tunnel.

[0008] The outlet flange assembly includes an outlet flange body and an air inlet pipe. The outlet flange body includes an air inlet channel formed by slots, which is connected to the air inlet pipe. The outlet flange body has a stepped through hole at its center, which includes a first slot and a second slot. The first slot is located on the side of the outlet flange body facing the inlet flange assembly and is opposite to the light-transmitting hole on the inlet flange body. The second slot is located on the side of the outlet flange body away from the inlet flange assembly and is threaded to an air-cooling bolt. The wall of the second slot has an opening at one end of the air inlet channel away from the air inlet pipe. Infrared glass is installed on the stepped surface between the first and second slots, and both sides of the infrared glass are sealed by sealing rings.

[0009] The air-cooled bolt includes a light-transmitting hole through the air-cooled bolt; cooling air from the second slot flows out through the light-transmitting hole to purge and cool the outer surface of the infrared glass.

[0010] In conjunction with the first aspect, in some implementations of the first aspect, the inlet flange body is provided with an annular water tank on the side facing the outlet flange assembly; the annular water tank and the water cooling tank are connected through a plurality of circumferentially distributed guide holes.

[0011] The outlet flange body has a first outlet hole and a second outlet hole on the side facing the inlet flange assembly. The projection of the first outlet hole and the second outlet hole onto the inlet flange assembly is along the hole axis. The projection areas of the first outlet hole and the second outlet hole are both located within the annular water tank. The outlet flange assembly also includes a first outlet pipe and a second outlet pipe. The first outlet pipe is connected to the first outlet hole, and the second outlet pipe is connected to the second outlet hole, so that the cooling water in the annular water tank can flow out through the first outlet pipe and the second outlet pipe.

[0012] In conjunction with the first aspect, in some implementations of the first aspect, the light-transmitting hole of the inlet flange body penetrates the central frustum of the water-cooling tank and the central frustum of the annular water tank.

[0013] The inlet flange body is also provided with a sealing groove on the central circular platform of the water cooling tank, and the sealing groove is arranged around the outer periphery of the light-transmitting hole.

[0014] The inlet flange body is also provided with a sealing groove on the central circular platform of the annular water tank, and the sealing groove is arranged around the outer periphery of the light-transmitting hole.

[0015] In conjunction with the first aspect, in some implementations of the first aspect, an annular sealing groove is also provided on the end face of the inlet flange body facing the outlet flange assembly and on the outer periphery of the annular water groove, and the inlet flange assembly and the outlet flange assembly are sealed on the connection surface by means of an O-ring through the sealing groove.

[0016] In conjunction with the first aspect, in some implementations of the first aspect, the air-cooled bolt further includes a head, a threaded section, and an air-cooled section; when the air-cooled bolt is assembled on the outlet flange body, the head is fixed to the end face of the outlet flange body; the threaded end is threadedly connected to the second slot of the outlet flange body; the outer diameter of the air-cooled section is smaller than the outer diameter of the threaded section, so that the air-cooled section extends into the second slot and forms an air-cooled chamber with the slot wall; the cooling gas enters through the air inlet pipe and enters the air-cooled chamber through the air inlet channel; the air-cooled section has multiple purge holes evenly distributed around its circumference, so that the gas in the air-cooled chamber flows out through the purge holes and the light-transmitting holes.

[0017] In conjunction with the first aspect, in some implementations of the first aspect, the blowing direction at the blow hole forms a 45-degree angle with the tangential direction of the inner wall of the air-cooled bolt.

[0018] In conjunction with the first aspect, in some implementations of the first aspect, the air-cooled section has a sealing groove on the side facing the infrared glass, and the sealing surface between the infrared glass and the air-cooled bolt is sealed by an O-ring through the sealing groove; a sealing groove can be provided on the stepped surface of the stepped through hole facing the infrared glass, and the sealing surface between the water outlet flange assembly and the infrared glass is sealed by an O-ring through the sealing groove.

[0019] In conjunction with the first aspect, in some implementations of the first aspect, the inner diameter of the light-transmitting hole is smaller than the inner diameter of the first slot, and the inner diameter of the first slot is smaller than the inner diameter of the second slot.

[0020] In conjunction with the first aspect, in some implementations of the first aspect, the inlet flange assembly, the outlet flange assembly, and the air-cooled bolts are all made of copper.

[0021] In conjunction with the first aspect, in some implementations of the first aspect, an annular sealing groove is provided on the end face of the inlet flange body facing away from the outlet flange assembly and located on the outer periphery of the water cooling tank. The inlet flange assembly and the tail of the high-frequency induction wind tunnel are sealed on the connection surface by an O-ring through the sealing groove.

[0022] Compared with the prior art, the solution provided by the present invention has at least the following beneficial technical effects:

[0023] 1. The components used in this invention have simple structures, low costs, and are easy to manufacture.

[0024] 2. This invention can be used for normal radiation temperature measurement in high-frequency induction wind tunnel stagnation tests. Compared with traditional side radiation temperature measurement of test sections, it can eliminate the uncertain influence of material surface emissivity caused by directional changes.

[0025] 3. This invention can be used for temperature measurement throughout the entire test process. Compared with traditional side radiation temperature measurement of the test section, it can avoid the impact on measurement accuracy caused by the model's retreat due to ablation, which leads to changes in the measurement angle during the test.

[0026] 4. Because this invention achieves normal radiation temperature measurement, the intensity of the model radiation signal reaches its maximum, which can improve the signal-to-noise ratio during the measurement process and thus improve the measurement accuracy. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0028] Figure 2 This is a cross-sectional view of the overall structure.

[0029] Figure 3 This is a schematic diagram of the front and back structures of the water inlet flange in this invention.

[0030] Figure 4 This is a cross-sectional view of the water inlet flange structure in this invention.

[0031] Figure 5 This is a schematic diagram of the front and back structures of the water outlet flange in this invention.

[0032] Figure 6 This is a schematic diagram of the front and back structures of the air-cooled bolt in this invention. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] like Figure 1 and Figure 2 As shown, the present invention provides a normal radiation temperature measurement window for a high-frequency induction wind tunnel stagnation test, comprising: an inlet flange assembly 28, an outlet flange assembly 29, an air-cooled bolt 30, and an infrared glass 40. In some embodiments, the inlet flange assembly 28, the outlet flange assembly 29, and the air-cooled bolt 30 are all made of copper, which has good thermal conductivity, thereby improving the durability and reliability of the device.

[0035] Figure 3 and Figure 4 A schematic diagram of the inlet flange assembly 28 is shown. The inlet flange assembly 28 includes an inlet flange body, a first inlet pipe 1, and a second inlet pipe 8. The inlet flange body includes a first inlet channel 11 and a second inlet channel 34 formed by slots. The first inlet channel 11 is connected and communicates with the first inlet pipe 1, and the second inlet channel 34 is connected and communicates with the second inlet pipe 8.

[0036] The inlet flange body also includes a water-cooling tank 10. The water-cooling tank 10 is annular, located in the center of the inlet flange body, and on the side of the inlet flange body opposite to the outlet flange assembly 29. The end of the first inlet channel 11 opposite to the first inlet pipe 1 opens into the tank wall of the water-cooling tank 10. The end of the second inlet channel 34 opposite to the second inlet pipe 8 opens into the tank wall of the water-cooling tank 10. An annular sealing groove 9 is also provided on the end face of the inlet flange body opposite to the outlet flange assembly 29 and located on the outer periphery of the water-cooling tank 10. The connection surface between the inlet flange assembly 28 and the tail of the high-frequency heater is sealed using an O-ring through the sealing groove 9.

[0037] An annular water groove 5 is provided on the side of the inlet flange body facing the outlet flange assembly 29. The annular water groove 5 and the water cooling tank 10 are connected by a plurality of circumferentially distributed guide holes 7. An annular sealing groove 4 is also provided on the end face of the inlet flange body facing the outlet flange assembly 29 and on the outer periphery of the annular water groove 5. The connection surface of the inlet flange assembly 28 and the outlet flange assembly 29 is sealed by an O-ring through the sealing groove 4.

[0038] The inlet flange body has a through-hole 12 at its center, which is positioned opposite to the air-cooled bolt 30 and extends through the central frustum of the water-cooled tank 10 and the central frustum of the annular water tank 5. A sealing groove 13 is also provided on the central frustum of the water-cooled tank 10, surrounding the outer periphery of the through-hole 12. A sealing groove 6 is also provided on the central frustum of the annular water tank 5, surrounding the outer periphery of the through-hole 12.

[0039] Cooling water enters through the first inlet pipe 1 and the second inlet pipe 8, and then enters the water-cooling tank 10 through the first inlet channel 11 and the second inlet channel 34, and then enters the annular water tank 5 through the guide hole 7.

[0040] The inlet flange body is also provided with through holes 2 and countersunk holes 3 for fixing and installing the inlet flange assembly 28 on the equipment. After the entire assembly is connected, it is sealed to the tail end of the high-frequency induction wind tunnel using screws through several through holes 2 on the inlet flange assembly 28.

[0041] Figure 5A schematic diagram of the outlet flange assembly 29 is shown. The outlet flange assembly 29 includes an outlet flange body, a first outlet pipe 14, and a second outlet pipe 23. The outlet flange body has a first outlet hole 22 and a second outlet hole 20 on the side facing the inlet flange assembly 28. Projecting the first outlet hole 22 and the second outlet hole 20 onto the inlet flange assembly 28 along the hole axis, the projection areas of both the first outlet hole 22 and the second outlet hole 20 are located within the annular water tank 5. Separate water channels are established between the first outlet pipe 14, the second outlet pipe 23, and the first outlet hole 22 and the second outlet hole 20, respectively. Cooling water flowing through the annular water tank 5 exits through the first outlet pipe 14 and the second outlet pipe 23.

[0042] The outlet flange body has a stepped through hole at its center, comprising a first slot 21 and a second slot 18. The first slot 21 is located on the side of the outlet flange body facing the inlet flange assembly 28, opposite to the through hole 12 on the inlet flange body. The second slot 18 is located on the side of the outlet flange body away from the inlet flange assembly 28 and is threadedly connected to the air-cooling bolt 30. Figure 2 In the illustrated embodiment, the inner diameter of the light-transmitting hole 12 can be smaller than the inner diameter of the first slot 21, and the inner diameter of the first slot 21 can be smaller than the inner diameter of the second slot 18. A sealing groove 16 can be provided on the stepped surface of the stepped through hole facing the infrared glass 40.

[0043] The outlet flange assembly 29 also includes an air inlet pipe 19. The outlet flange body includes an air inlet channel 17 formed by a slot, which is connected to the air inlet pipe 19. One end of the air inlet channel 17 facing away from the air inlet pipe 19 is opened in a second slot 18 of the outlet flange body. An infrared glass 40 is disposed on the stepped surface between the first slot 21 and the second slot 18, and both sides of the infrared glass 40 are sealed by sealing rings.

[0044] The outlet flange body is also provided with through holes 15 for fixing and installing the outlet flange assembly 29 on the equipment. The front of the inlet flange assembly 28 and the back of the outlet flange assembly 29 can be connected by screws through several countersunk holes 3 and several through holes 15.

[0045] like Figure 2 and Figure 6As shown, the air-cooled bolt 30 includes a light-transmitting hole 27 through the bolt. The air-cooled bolt 30 also includes a head, a threaded section 25, and an air-cooled section. When the air-cooled bolt 30 is assembled onto the outlet flange body, the head is fixed to the end face of the outlet flange body; the threaded end is threadedly connected to the second slot 18 of the outlet flange body; the outer diameter of the air-cooled section is smaller than the outer diameter of the threaded section 25, thus the air-cooled section extends into the second slot 18, forming an air-cooled chamber 32 with the wall of the second slot 18. An air passage is established between the air inlet 19 and the air inlet channel 17, allowing cooling air to enter through the air inlet pipe 19 and then through the air inlet channel 17 into the air-cooled chamber 32. Multiple purge holes 24 are evenly distributed circumferentially on the air-cooled section, allowing gas from the air-cooled chamber 32 to enter the light-transmitting hole 27 through the purge holes 24 and flow out to purge and cool the outer surface of the infrared glass. In one embodiment, the purge direction at the purge holes 24 forms a 45-degree angle with the tangential direction of the inner wall of the air-cooled bolt 30.

[0046] Infrared glass 40 is positioned between the water-cooled flange assembly 29 and the air-cooled bolt 30 connection surfaces. The air-cooled section has a sealing groove 26 on the side facing the infrared glass 40 to accommodate a sealing ring, achieving a sealed contact between the air-cooled bolt 30 and the infrared glass 40. The sealing surface between the outlet flange assembly 29 and the infrared glass 40 is sealed using an O-ring through the sealing groove 16, and the sealing surface between the infrared glass 40 and the air-cooled bolt 30 is sealed using an O-ring through the sealing groove 26.

[0047] In summary, the entire window assembly is sealed to the tail of the high-frequency induction wind tunnel via the inlet flange assembly 28 to form a water-cooled tank 10. The inlet flange assembly 28 and the outlet flange assembly 29 are sealed together to form an annular water tank 5. Cooling water enters through the first inlet pipe 1 and the second inlet pipe 8, and then flows through the first inlet channel 11 and the second inlet channel 34 into the water-cooled tank 10, before entering the annular water tank 5 through the guide hole 7. The cooling water in the annular water tank 5 then flows through the first outlet hole 22 and the second outlet hole 20, and then flows out through the first outlet pipe 14 and the second outlet pipe 23. The cooling water is used to cool the arc-heated airflow at the tail of the high-frequency induction wind tunnel.

[0048] Additionally, the air-cooled bolt 30 and the water outlet flange assembly 29 are sealed together to form the air-cooled chamber 32. An air passage connects the air inlet 19 and the air inlet channel 17, allowing cooling air to enter through the air inlet pipe 19 and then through the air inlet channel 17 into the air-cooled chamber 32. The cooling airflow passes through the air-cooled chamber 32, exits through the purge hole 24 and the light transmission hole 27, thus purging and cooling the outer surface of the infrared glass. The infrared glass 40 is sealed between the air-cooled bolt 30 and the water outlet flange assembly 29.

[0049] 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 without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope defined in the claims of the present invention.

Claims

1. A normal radiation temperature measurement window for high-frequency induction wind tunnel stagnation point tests, characterized in that, It includes an inlet flange assembly (28), an outlet flange assembly (29), air-cooled bolts (30), and infrared glass (40); The water inlet flange assembly (28) is used to connect to the tail of the high-frequency induction wind tunnel. The center of the water inlet flange body has a through light hole (12), which is set opposite to the air-cooled bolt (30). The inlet flange assembly (28) includes an inlet flange body, a first inlet pipe (1) and a second inlet pipe (8); the inlet flange body includes a first inlet channel (11) and a second inlet channel (34) formed by a slot; the first inlet channel (11) is connected to the first inlet pipe (1) and the second inlet channel (34) is connected to the second inlet pipe (8); The inlet flange body also includes a water cooling tank (10); the water cooling tank (10) is annular and located in the center of the inlet flange body; the water cooling tank (10) is located on the side of the inlet flange body away from the outlet flange assembly (29); the water cooling tank (10) is connected to the first water inlet channel (11) and the second water inlet channel (34), and the cooling water entering the water cooling tank (10) is used to cool the hot airflow at the tail of the high-frequency induction wind tunnel; The outlet flange assembly (29) includes an outlet flange body and an air inlet pipe (19); the outlet flange body includes an air inlet channel (17) formed by a slot, which is connected to the air inlet pipe (19); the outlet flange body has a stepped through hole at the center, which includes a first slot (21) and a second slot (18); the first slot (21) is located on the side of the outlet flange body facing the inlet flange assembly (28), and is opposite to the light hole (12) on the inlet flange body; the second slot (18) is located on the side of the outlet flange body away from the inlet flange assembly (28), and is threaded to the air-cooled bolt (30), and the wall of the second slot (18) has an opening at one end of the air inlet channel (17) away from the air inlet pipe (19); an infrared glass (40) is provided on the stepped surface between the first slot (21) and the second slot (18), and the infrared glass (40) is sealed on both sides by sealing rings. The air-cooled bolt (30) includes a light-transmitting hole (27) through the air-cooled bolt (30); cooling air from the second slot (18) flows out through the light-transmitting hole (27) to purge and cool the outer surface of the infrared glass.

2. The high-frequency induction wind tunnel stagnation test normal radiation temperature measurement window according to claim 1, characterized in that, The inlet flange body is provided with an annular water tank (5) on the side facing the outlet flange assembly (29); the annular water tank (5) and the water cooling tank (10) are connected by multiple circumferentially distributed guide holes (7); The outlet flange body is provided with a first outlet hole (22) and a second outlet hole (20) on the side facing the inlet flange assembly (28). The projection of the first outlet hole (22) and the second outlet hole (20) onto the inlet flange assembly (28) is along the hole axis. The projection area of ​​the first outlet hole (22) and the projection area of ​​the second outlet hole (20) are both located in the annular water tank (5). The outlet flange assembly (29) also includes a first outlet pipe (14) and a second outlet pipe (23). The first outlet pipe (14) is connected to the first outlet hole (22), and the second outlet pipe (23) is connected to the second outlet hole (20), so that the cooling water in the annular water tank (5) flows out through the first outlet pipe (14) and the second outlet pipe (23).

3. The high-frequency induction wind tunnel stagnation test normal radiation temperature measurement window according to claim 2, characterized in that, The light-transmitting hole (12) of the inlet flange body passes through the central frustum of the water-cooling tank (10) and the central frustum of the annular water tank (5); The inlet flange body is also provided with a sealing groove (13) on the central circular platform of the water cooling tank (10), and the sealing groove (13) is arranged around the outer periphery of the light-transmitting hole (12); The inlet flange body is also provided with a sealing groove (6) on the central circular platform of the annular water tank (5), and the sealing groove (6) is arranged around the outer periphery of the light-transmitting hole (12).

4. The high-frequency induction wind tunnel stagnation test normal radiation temperature measurement window according to claim 2, characterized in that, On the end face of the inlet flange body facing the outlet flange assembly (29) and on the outer periphery of the annular water groove (5), an annular sealing groove (4) is also provided. The inlet flange assembly (28) and the outlet flange assembly (29) are sealed on the connection surface by an O-ring through the sealing groove (4).

5. The high-frequency induction wind tunnel stagnation test normal radiation temperature measurement window according to claim 1, characterized in that, The air-cooled bolt (30) also includes a head, a threaded section (25) and an air-cooled section; when the air-cooled bolt (30) is assembled on the water outlet flange body, the head is fixed on the end face of the water outlet flange body; the threaded end is threadedly connected to the second hole groove (18) of the water outlet flange body; the outer diameter of the air-cooled section is smaller than the outer diameter of the threaded section (25), so that the air-cooled section extends into the second hole groove (18) and forms an air-cooled chamber (32) with the groove wall of the second hole groove (18); the cooling gas enters through the air inlet pipe (19) and enters the air-cooled chamber (32) through the air inlet channel (17); the air-cooled section is evenly distributed with multiple purge holes (24) so ​​that the gas in the air-cooled chamber (32) flows out through the purge holes (24) and the light-transmitting hole (27).

6. The high-frequency induction wind tunnel stagnation test normal radiation temperature measurement window according to claim 5, characterized in that, The blowing direction at the blow hole (24) forms a 45-degree angle with the tangential direction of the inner wall of the air-cooled bolt (30).

7. The high-frequency induction wind tunnel stagnation test normal radiation temperature measurement window according to claim 5, characterized in that, The air-cooled section has a sealing groove (26) on the side facing the infrared glass (40). The sealing surface between the infrared glass (40) and the air-cooled bolt (30) is sealed by an O-ring through the sealing groove (26). A sealing groove (16) can be provided on the stepped surface of the stepped through hole facing the infrared glass (40). The sealing surface between the water outlet flange assembly (29) and the infrared glass (40) is sealed by an O-ring through the sealing groove (16).

8. The high-frequency induction wind tunnel stagnation test normal radiation temperature measurement window according to claim 1, characterized in that, The inner diameter of the light-transmitting hole (12) is smaller than the inner diameter of the first slot (21), and the inner diameter of the first slot (21) is smaller than the inner diameter of the second slot (18).

9. The high-frequency induction wind tunnel stagnation test normal radiation temperature measurement window according to claim 1, characterized in that, The inlet flange assembly (28), the outlet flange assembly (29), and the air-cooled bolts (30) are all made of copper.

10. The high-frequency induction wind tunnel stagnation test normal radiation temperature measurement window according to claim 1, characterized in that, On the end face of the inlet flange body away from the outlet flange assembly (29) and located on the outer periphery of the water cooling tank (10), an annular sealing groove (9) is also provided. The inlet flange assembly (28) and the tail of the high-frequency induction wind tunnel are sealed on the connection surface by an O-ring through the sealing groove (9).

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