A filter device for a hypersonic wind tunnel thermal storage heater

Abstract

A filtering device for a hypersonic wind tunnel thermal storage heater belongs to the technical field of wind tunnel testing. The invention aims to solve the problem of thermal storage material oxidation and erosion, and the falling particles affecting the test effect. It includes a first filter body, a second filter body and a third filter body; a water cooling jacket is provided on the outer periphery of the outer shell, and a cavity is formed between the water cooling jacket and the outer shell. The first filter body, the second filter body and the third filter body are sequentially sleeved and arranged in the outer shell from the inside to the outside. The side walls and bottom walls of the first filter body, the second filter body and the third filter body are provided with a plurality of filtering and rectifying holes. The outer shell is provided with a first temperature measuring port, a second temperature measuring port and a pressure measuring port. The first temperature measuring port is located at the front side of the filtering system. The first temperature measuring port and the second temperature measuring port are both equipped with temperature sensors, and the pressure measuring port is equipped with a pressure sensor. The invention adopts a three-layer independent filtering structure to filter and rectify the medium to obtain clean gas. The structure is compact, the overall length is not increased, and the operation is convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of wind tunnel testing, and in particular relates to a filtering device for a thermal storage heater of a hypersonic wind tunnel. Background Art

[0002] In a hypersonic wind tunnel, as the air enters the nozzle and expands rapidly, the temperature of the airflow drops rapidly, and condensation occurs in the test section. In order to delay or eliminate condensation, increasing the air temperature in the stable section is the most commonly used method in hypersonic wind tunnels. In addition, hypersonic wind tunnels must not only prevent air condensation at extremely high Mach numbers, but also simulate the high temperature of actual flight. According to the test requirements, higher temperatures need to be achieved, and the development of heaters has become one of the key technologies in the development of hypersonic wind tunnels.

[0003] At present, the heaters used in conventional hypersonic wind tunnels are mainly divided into two types according to the heating method, namely: continuous heaters and thermal storage heaters.

[0004] The thermal storage heater is composed of a hollow brick thermal storage unit contained in a steel pressure vessel, a thermal insulation layer and other parts. It can use low-power heating for a long time to make the thermal storage element reach a higher temperature, and then heat the test gas, which is suitable for simulating higher real flight temperatures.

[0005] The hollow brick type heat storage unit is the core of the heat storage heater. The performance of the heat storage material must meet the following characteristics: large heat capacity; high high temperature strength; small creep; strong airflow erosion resistance; resistance to cold and hot shocks; long-term use without cracking. Common heat storage materials include high-purity alumina and high-temperature alloys such as nickel-based alloys. In order to cope with higher ultra-high temperature conditions, new materials such as graphite are gradually being studied and applied in this field. Although the heat storage material is a high-temperature resistant material, when it is heated to a certain temperature in the air for a long time, oxidation and erosion will occur on the surface, and dust, particles and even slag will fall off, affecting the airflow quality and experimental results of the wind tunnel experiment. The general treatment method is to check and clean the equipment regularly, and filtration is rarely considered during the experiment. However, under ultra-high temperature conditions, the erosion of the heat storage material will increase significantly, the particles will become larger, and the slag will become more, which will not only affect the test results, but in severe cases, it may damage the wind tunnel components such as the nozzle, and needs to be filtered or cleaned in time. Summary of the invention

[0006] The purpose of the present invention is to provide a filtering device for a hypersonic wind tunnel thermal storage heater to solve the problem of oxidation and erosion of thermal storage materials and falling particles affecting the test results. The technical solution adopted by the present invention is as follows:

[0007] A filtering device for a hypersonic wind tunnel thermal storage heater comprises a first filter body, a second filter body, a third filter body, a fixing ring, a protective cone sleeve, an outer shell and an inner liner cone tube;

[0008] The outer shell comprises a first inlet pipe section, a first diameter-reducing pipe section and a first outlet pipe section which are connected in sequence from front to back, the inner diameter of the first inlet pipe section is larger than the inner diameter of the first outlet pipe section, a water cooling jacket is arranged on the outer periphery of the outer shell, a cavity is formed between the water cooling jacket and the outer shell, a water inlet is arranged at the lower end of the water cooling jacket, a water outlet is arranged at the upper end of the water cooling jacket, a protective cone sleeve is arranged in the first inlet pipe section, a large diameter end of the protective cone sleeve is connected to the inner wall of the first inlet pipe section, a small diameter end of the protective cone sleeve is arranged forward, and an outlet liner pipe is arranged in the first outlet pipe section;

[0009] The first filter body, the second filter body and the third filter body are all cylindrical components with an opening at the front end and a conical bottom at the rear end. The first filter body, the second filter body and the third filter body constitute a filtering system. The side walls and bottom walls of the first filter body, the second filter body and the third filter body are all provided with a plurality of filtering rectification holes. The inner liner tube includes a second inlet pipe section, a second reducing pipe section and a second outlet pipe section which are sequentially connected from front to back. The fixing ring is sleeved on the front end of the second inlet pipe section. The front ends of the first filter body, the second filter body and the third filter body are all provided with a flange structure. The first filter body, the second filter body and the third filter body are sleeved in sequence from inside to outside. The flange structure of the first filter body, the flange structure of the second filter body and the flange structure of the third filter body are fixed on the fixing ring in sequence. The outer periphery of the second outlet pipe section is slidably matched with the inner periphery of the outlet liner pipe. The outer periphery rear end of the fixing ring is provided with a chamfered structure. The conical surface of the chamfered structure is slidably abutted against the small diameter end of the protective cone sleeve.

[0010] A first temperature measuring port is provided on the first inlet pipe section, and the first temperature measuring port is located on the front side of the filtering system. A second temperature measuring port and a pressure measuring port are provided on the first outlet pipe section. Temperature sensors are installed on the first temperature measuring port and the second temperature measuring port, and a pressure sensor is installed on the pressure measuring port.

[0011] Furthermore, the aperture of the filter rectification holes on the first filter body is larger than the aperture of the filter rectification holes on the third filter body, the number of filter rectification holes on the first filter body is smaller than the number of filter rectification holes on the third filter body, and the effective flow area of ​​the filter rectification holes on the first filter body is larger than the effective flow area of ​​the filter rectification holes on the third filter body.

[0012] Furthermore, the first filter body is a high-temperature nickel-based alloy component, and 900 to 950 filter rectification holes with a diameter of 20 mm are opened on the first filter body, and the diameter of the outlet liner pipe is 200 mm.

[0013] Furthermore, the third filter body is a high-temperature nickel-based alloy component, and is provided with 4750 to 4800 filter rectification holes with a diameter of 6 mm.

[0014] Furthermore, the second filter body is a multi-mesh sintered wire mesh.

[0015] Furthermore, a plurality of hexagonal head bolts with holes penetrate the flange structure of the first filter body, the flange structure of the second filter body and the flange structure of the third filter body and are connected to the fixing ring, and the plurality of hexagonal head bolts with holes are connected in series through bolt anti-loosening parts.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention adopts a three-layer independent filtering structure to filter the medium. The flowing medium enters from the first filter body, is filtered through the sintered mesh of the second filter body, and is dispersed from the third filter body to the outlet, completing the filtration and rectification to obtain clean gas. The structure is compact and reasonable, does not increase the overall length, is easy to operate, and meets the demand for convenient replacement of filter components. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a cross-sectional view of the present invention;

[0019] Figure 2 yes Figure 1 A magnified image of point A;

[0020] Figure 3 is an axonometric view of the present invention;

[0021] Figure 4 It is a schematic structural diagram of the first filter body.

[0022] In the figure, 1. first filter body, 2. second filter body, 3. third filter body, 4. fixing ring, 5. protective cone sleeve, 6. water cooling jacket, 7. outer shell, 71. first inlet pipe section, 72. first reducer pipe section, 73. first outlet pipe section, 74. first temperature measuring port, 75. second temperature measuring port, 76. pressure measuring port, 8. inner lined spinal tube, 81. second inlet pipe section, 82. second reducer pipe section, 83. second outlet pipe section, 9. outlet inner lined pipe. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is described below by the specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0024] The connection mentioned in the present invention is divided into fixed connection and detachable connection. The fixed connection is a non-detachable connection including but not limited to conventional fixed connection methods such as folding connection, rivet connection, bonding connection and welding connection. The detachable connection includes but not limited to conventional detachable methods such as bolt connection, snap connection, pin connection and hinge connection. When the specific connection method is not clearly defined, it is assumed that at least one connection method can be found in the existing connection methods to achieve the function, and those skilled in the art can choose according to their needs. For example: welding connection is selected for fixed connection, and bolt connection is selected for detachable connection.

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings. The following embodiments are provided to explain the present invention, but the present invention is not limited to the following embodiments.

[0026] Example: Figure 1 to Figure 4 As shown, a filtering device for a hypersonic wind tunnel thermal storage heater comprises a first filter body 1, a second filter body 2, a third filter body 3, a fixing ring 4, a protective cone sleeve 5, an outer shell 7 and an inner liner cone tube 8;

[0027] The outer shell 7 includes a first inlet pipe section 71, a first diameter-reducing pipe section 72 and a first outlet pipe section 73 which are connected in sequence from front to back. The inner diameter of the first inlet pipe section 71 is larger than the inner diameter of the first outlet pipe section 73. A water cooling jacket 6 is provided on the outer periphery of the outer shell 7. A cavity is formed between the water cooling jacket 6 and the outer shell 7. A water inlet is provided at the lower end of the water cooling jacket 6, and a water outlet is provided at the upper end of the water cooling jacket 6. Cooling water enters from the bottom and exits from the top through the water cooling jacket 6, and flows through the outer surface of the outer shell 7 to realize circulating water cooling of the outer shell 7. The protective cone sleeve 5 is arranged in the first inlet pipe section 71. The large-diameter end of the protective cone sleeve 5 is connected to the inner wall of the first inlet pipe section 71, and the small-diameter end of the protective cone sleeve 5 is arranged forward. An outlet liner pipe 9 is provided in the first outlet pipe section 73, and the outlet liner pipe 9 is spot welded on the inner wall of the first outlet pipe section 73.

[0028] The first filter body 1, the second filter body 2 and the third filter body 3 are all cylindrical components with an opening at the front end and a conical bottom at the rear end. The first filter body 1, the second filter body 2 and the third filter body 3 constitute a filtering system. The side walls and bottom walls of the first filter body 1, the second filter body 2 and the third filter body 3 are provided with a plurality of filtering rectification holes to reduce the impact load of the medium filtering system, ensure the performance of the filtering system and improve the service life. The conical bottom structure of the first filter body 1, the second filter body 2 and the third filter body 3 with filtering rectification holes can also play a rectifying role to obtain a relatively uniform air flow field, reduce the impact load of the airflow medium, and do not lose the airflow pressure. The inner liner vertebral tube 8 includes a second inlet pipe section 81, a second reducing pipe section 82 and a second outlet pipe section 83 connected in sequence from front to back, and the fixing ring 4 is sleeved on the second inlet pipe section 81. At the front end, the front ends of the first filter body 1, the second filter body 2 and the third filter body 3 are all provided with flange structures. The first filter body 1, the second filter body 2 and the third filter body 3 are sleeved from the inside to the outside in sequence. The flange structures of the first filter body 1, the second filter body 2 and the third filter body 3 are fixed on the fixing ring 4 in sequence. The outer periphery of the second outlet pipe section 83 is slidably matched with the inner periphery of the outlet inner liner 9, which facilitates the axial movement of the inner liner 8 when the airflow medium impacts the filter system, realizing airflow buffering. The outer periphery rear end of the fixing ring 4 is provided with a chamfered structure, and the conical surface of the chamfered structure is slidably abutted with the small diameter end of the protective cone sleeve 5; when the airflow medium flows through the filter system and generates impact load or temperature stress to it, the contact between the inclined surface of the fixing ring 4 and the protective cone sleeve 5 generates sliding to gradually reduce the impact and temperature stress, playing the role of airflow impact prevention. And the filter system can be quickly replaced, which is convenient and fast. The outlet liner tube 9 is spot welded on the inner wall of the shell 7, and the outlet end of the liner cone tube 8 extends into the outlet liner tube 9, so that the liner cone tube 8 can move axially when the air flow medium impacts the filter system, thereby achieving air flow buffering;

[0029] The first inlet pipe section 71 is provided with a first temperature measuring port 74, and the first temperature measuring port 74 is located at the front side of the filtering system. The first outlet pipe section 73 is provided with a second temperature measuring port 75 and a pressure measuring port 76. The first temperature measuring port 74 and the second temperature measuring port 75 are both installed with temperature sensors, and the pressure measuring port 76 is installed with a pressure sensor. The two temperature sensors and the pressure sensor measure the temperature and pressure of the airflow medium on both sides of the filtering system, monitor the experimental data in real time, and ensure the safety of the experiment.

[0030] The aperture of the filter rectification holes on the first filter body 1 is larger than the aperture of the filter rectification holes on the third filter body 3 , the number of filter rectification holes on the first filter body 1 is smaller than the number of filter rectification holes on the third filter body 3 , and the effective flow area of ​​the filter rectification holes on the first filter body 1 is larger than the effective flow area of ​​the filter rectification holes on the third filter body 3 .

[0031] The first filter body 1 is a high-temperature nickel-based alloy component. The first filter body 1 is provided with 900 to 950 filter rectification holes with a diameter of 20 mm, and the effective flow cross-sectional area is greater than 282742 mm 2 The diameter of the outlet liner 9 is 200 mm, and the flow area of ​​the outlet liner 9 is 31415 mm 2 The effective flow area of ​​the filter rectification hole on the first filter body 11 is 9 times the flow cross-sectional area of ​​the outlet liner tube 9. The first filter body 11 will not affect the flow rate. The function of the first filter body 11 is to filter larger particles, rectify the medium, protect and fix the second filter body 2.

[0032] The third filter body 3 is a high-temperature nickel-based alloy component. The third filter body 33 is provided with 4750 to 4800 filter rectification holes with a diameter of 6 mm, and the effective flow cross-sectional area is about 134300 mm 2 , which is 4.2 times of the flow cross-sectional area of ​​the outlet liner tube 9. The third filter body 3 will not affect the flow rate. The main function of the third filter body 3 is to protect and fix the second filter body 2. The filtration system composed of the first filter body 1, the second filter body 2 and the third filter body 3 has a compact structure, which can not only reduce the overall length of the equipment, but also improve the life of the equipment, ensuring the safe and effective conduct of the test.

[0033] The second filter body 2 is a multi-mesh sintered wire mesh, and its main function is filtering.

[0034] A number of hexagonal head bolts with holes penetrate the flange structure of the first filter body 1, the flange structure of the second filter body 2 and the flange structure of the third filter body 3, and are connected to the fixing ring 4. To prevent the bolts from falling off, a number of hexagonal head bolts with holes are connected in series through bolt anti-loosening parts. The hexagonal head bolts with holes are used to fix the first filter body 1, the second filter body 2 and the third filter body 3, which can well absorb the impact load and vibration caused by the airflow. At the same time, this structure is convenient for inspection and maintenance.

[0035] The present invention adopts a three-layer independent filtering structure to filter the medium. The flowing medium enters from the first filter body 1, is filtered through the sintered mesh of the second filter body 2, and is dispersed to the outlet from the third filter body 3, completing the filtration and rectification to obtain clean gas. The structure is compact and reasonable, does not increase the overall length, is easy to operate, and meets the demand for convenient replacement of filter components.

[0036] The above embodiments are merely exemplary descriptions of the present invention and do not limit its protection scope. Those skilled in the art may also make partial changes thereto, which are within the protection scope of the present invention as long as they do not exceed the spirit of the present invention.

Claims

1. A filtering device for a hypersonic wind tunnel thermal storage heater, characterized in that: It comprises a first filter body (1), a second filter body (2), a third filter body (3), a fixing ring (4), a protective cone sleeve (5), an outer shell (7) and an inner liner cone tube (8); The outer shell (7) comprises a first inlet pipe section (71), a first diameter-reducing pipe section (72) and a first outlet pipe section (73) which are connected in sequence from front to back. The inner diameter of the first inlet pipe section (71) is larger than the inner diameter of the first outlet pipe section (73). A water cooling jacket (6) is provided on the outer periphery of the outer shell (7). A cavity is formed between the water cooling jacket (6) and the outer shell (7). A water inlet is provided at the lower end of the water cooling jacket (6). A water outlet is provided at the upper end of the water cooling jacket (6). A protective cone sleeve (5) is arranged in the first inlet pipe section (71). The large-diameter end of the protective cone sleeve (5) is connected to the inner wall of the first inlet pipe section (71). The small-diameter end of the protective cone sleeve (5) is arranged forward. An outlet liner pipe (9) is provided in the first outlet pipe section (73). The first filter body (1), the second filter body (2) and the third filter body (3) are all cylindrical components with an open front end and a conical bottom at the rear end. The first filter body (1), the second filter body (2) and the third filter body (3) constitute a filtering system. The side walls and the bottom walls of the first filter body (1), the second filter body (2) and the third filter body (3) are all provided with a plurality of filtering rectification holes. The inner liner cone (8) comprises a second inlet pipe section (81), a second diameter reducing pipe section (82) and a second outlet pipe section (83) which are connected in sequence from front to back. The fixing ring (4) is sleeved on the front end of the second inlet pipe section (81). The first The front ends of the filter body (1), the second filter body (2) and the third filter body (3) are all provided with flange structures. The first filter body (1), the second filter body (2) and the third filter body (3) are sequentially sleeved from the inside to the outside. The flange structure of the first filter body (1), the flange structure of the second filter body (2) and the flange structure of the third filter body (3) are sequentially abutted and fixed on the fixing ring (4). The outer periphery of the second outlet pipe section (83) is slidably matched with the inner periphery of the outlet inner liner pipe (9). The rear end of the outer periphery of the fixing ring (4) is provided with a chamfered structure. The conical surface of the chamfered structure is slidably abutted with the small-diameter end of the protective cone sleeve (5). The first inlet pipe section (71) is provided with a first temperature measuring port (74), and the first temperature measuring port (74) is located at the front side of the filtering system. The first outlet pipe section (73) is provided with a second temperature measuring port (75) and a pressure measuring port (76), and the first temperature measuring port (74) and the second temperature measuring port (75) are both installed with temperature sensors, and the pressure measuring port (76) is installed with a pressure sensor.

2. A filtering device for a hypersonic wind tunnel thermal storage heater according to claim 1, characterized in that: The pore size of the filter rectification holes on the first filter body (1) is larger than the pore size of the filter rectification holes on the third filter body (3), the number of the filter rectification holes on the first filter body (1) is smaller than the number of the filter rectification holes on the third filter body (3), and the effective flow area of ​​the filter rectification holes on the first filter body (1) is larger than the effective flow area of ​​the filter rectification holes on the third filter body (3).

3. A filtering device for a hypersonic wind tunnel thermal storage heater according to claim 2, characterized in that: The first filter body (1) is a high-temperature nickel-based alloy component. 900 to 950 filter rectification holes with a diameter of 20 mm are provided on the first filter body (1). The diameter of the outlet lining pipe (9) is 200 mm.

4. The filtering device for a hypersonic wind tunnel thermal storage heater according to claim 3, characterized in that: The third filter body (3) is a high-temperature nickel-based alloy component, and is provided with 4750 to 4800 filter rectification holes with a diameter of 6 mm.

5. The filtering device for a hypersonic wind tunnel thermal storage heater according to claim 4, characterized in that: The second filter body (2) is a multi-mesh sintered wire mesh.

6. A filtering device for a hypersonic wind tunnel thermal storage heater according to any one of claims 1 to 5, characterized in that: A plurality of hexagonal head bolts with holes penetrate the flange structure of the first filter body (1), the flange structure of the second filter body (2) and the flange structure of the third filter body (3) and are connected to the fixing ring (4). The plurality of hexagonal head bolts with holes are connected in series via bolt anti-loosening parts.

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