A high-temperature gas injection device for thermal testing

Abstract

A high-temperature gas injection device for thermal testing belongs to the field of high-temperature gas injection device design. This invention includes a water-cooled baffle, a multi-nozzle flame injector, a motor, a water outlet pipe, and a water inlet pipe. The multi-nozzle flame injector includes nozzles, a manifold box, and a welding torch connected in sequence, with the welding torch connected to oxygen and acetylene gas pipelines respectively. The water-cooled baffle is located in front of the nozzles, and its interior is divided by ribs to form coolant channels. Cylindrical ribs are arranged within the coolant channels, perpendicular to the direction of the water-cooled baffle. The inner surface of the ribs is fitted with the nozzles with a clearance, and the outer surface of the ribs is in contact with the coolant. Two sets of motors are included, each controlling the horizontal and vertical movement of the high-temperature gas injection device for thermal testing via cranks. This invention can meet the needs of ultra-high temperature heating, low cost, and multi-purpose thermal testing.

Description

Technical Field

[0001] This invention belongs to the field of high-temperature gas injection device design. It addresses the problems of low test temperatures and high costs associated with heating methods in high-speed acoustic thermal testing, aiming to meet the needs of ultra-high temperature heating, low cost, and multi-purpose applications in thermal testing benches. A high-temperature gas injection device for thermal testing is provided. Background Technology

[0002] Existing thermal testing methods for hypersonic vehicle thermal protection systems, both domestically and internationally, can be categorized into the following main types based on heating method: electric arc heating, gas heating, regenerative heating, and radiation heating. Electric arc heating offers advantages such as high enthalpy and simple gaseous medium composition, but its short heating time limits its application in high-temperature inertial system testing. Regenerative heating offers advantages such as clean air and high flow rate, but its long heat storage time and high testing cost make it difficult to meet the requirements of high-frequency testing. Radiation heating methods include quartz lamp, xenon arc lamp, and graphite heating, which offer the advantage of providing relatively accurate and adjustable thermal flux boundary conditions, but its high testing cost limits its application. High-temperature gas heating can be divided into direct-drive and jet-flow types based on the heating method. Direct-drive heating connects high-temperature gas to the test channel, creating a gas flow environment with a certain pressure and flow rate around the test object. This method is suitable for thermal evaluation tests with pressure and velocity requirements for the incoming gas. Jet heating involves directly injecting high-temperature gas into the surface of the object for direct heating. It has advantages such as simple structure and low cost, but it cannot provide a stable test pressure environment.

[0003] Currently, heating devices capable of performing ultra-high temperature (heating temperature ≥2500K) thermal testing on materials and structures can be categorized into small and large ultra-high temperature thermal testing devices based on size. Small ultra-high temperature thermal testing devices mainly include oxy-acetylene ablation testing machines and plasma jet testing machines. These devices are primarily designed for ultra-high temperature thermal testing of materials such as heat-resistant, heat-insulating, and coating materials, ceramic materials, composite materials, and refractory metals. Their main characteristics are: small test specimen size (<Φ30mm), suitable for material-level thermal testing, but difficult to perform thermal testing on the structure of the test specimen. Large ultra-high temperature thermal testing devices mainly include high-enthalpy wind tunnels, direct-drive test benches, and rocket engine ground test benches. These devices can perform thermal testing on test specimens of a wide range of sizes (material level, component level, and complete machine level), and also have aerodynamic load loading capabilities. However, the testing cost of large ultra-high temperature thermal testing devices is high, ranging from several thousand to tens of thousands of yuan per minute.

[0004] With the development of hypersonic vehicles, the demand for ground-based thermal testing of thermal protection technology is becoming increasingly strong. At the same time, thermal testing is also developing towards a more diverse range of test objects, higher test temperatures, and lower costs. Existing thermal testing heating methods are insufficient to meet the testing requirements of hypersonic vehicle thermal protection technology. Summary of the Invention

[0005] To address the limitations of existing small-scale ultra-high temperature thermal testing devices, which can only perform material-level thermal testing, and the high cost and long testing cycle of large-scale ultra-high temperature thermal testing devices, which are insufficient for current needs and future requirements in the high-speed acoustic field for high-temperature, multi-purpose (ablation, active and passive thermal protection testing), diverse test specimen structures (leading edge, rear body / nozzle, front body / inlet, etc.), and low-cost operation, this invention proposes a high-temperature gas injection device for thermal testing, which can meet the needs of ultra-high temperature heating, low cost, and multi-purpose thermal testing.

[0006] The technical solution of this invention:

[0007] A high-temperature gas injection device for thermal testing includes a water-cooled baffle 1, a multi-nozzle flame injector 2, a motor 3, a water outlet pipe 5, and a water inlet pipe 6.

[0008] The multi-nozzle flame injector 2 includes a nozzle 21, a manifold box 22 and a welding torch 23 connected in sequence, with the welding torch 23 connected to oxygen and acetylene gas pipelines respectively;

[0009] Furthermore, a high-temperature gas injection device for thermal testing includes two or more multi-nozzle flame injectors 2, each multi-nozzle flame injector 2 including two or more nozzles 21 arranged in an array; oxygen and acetylene gases are mixed inside the welding torch 23, then enter the manifold 22 and are ejected through the nozzles 21 for combustion. A welding torch 23 of suitable model and specification is matched according to the number and specifications of the nozzles 21 to ensure that the flow rate meets the design requirements.

[0010] The water-cooled baffle 1 is disposed at the front of the nozzle 21, and the interior of the water-cooled baffle 1 is divided by ribs 13 to form a coolant channel. The beginning of the coolant channel is provided with a water inlet 11, which is connected to the water inlet pipe 6; the end of the coolant channel is provided with a water outlet 12, which is connected to the water outlet pipe 5; a cylindrical rib 14 is disposed inside the coolant channel, perpendicular to the direction of the water-cooled baffle 1, the inner surface of the rib 14 is in clearance fit with the nozzle 21, and the outer surface of the rib 14 is in contact with the coolant.

[0011] Furthermore, a thermally conductive material is filled between the nozzle 21 and the inner surface of the rib 14.

[0012] There are two sets of motors 3, and the two sets of motors 3 control the horizontal and vertical movements of the high-temperature gas injection device used for thermal testing through cranks.

[0013] Furthermore, a set of motors 3 is fixed on the fixed bracket 81, and its output end is connected to a crank 31. The eccentric shaft of the crank 31 cooperates with the horizontal slide groove on the movable bracket A82 to realize the horizontal reciprocating motion of the movable bracket A82. The slider set on the movable bracket A82 is placed in the slider guide rail 4 set in the horizontal direction on the fixed bracket 81, which guides the horizontal reciprocating motion of the movable bracket A82. The movable bracket B83 is fixedly connected to the water-cooled baffle 1. Another set of motors 3 is fixed on the movable bracket B83, and its output end is connected to another crank 31. The eccentric shaft of the crank 31 cooperates with the vertical slide groove on the movable bracket A82 to realize the up-down reciprocating motion of the movable bracket B83. The slider set on the movable bracket B83 is placed in the slider guide rail 4 set in the vertical direction on the movable bracket A82, which guides the vertical reciprocating motion of the movable bracket B83.

[0014] The beneficial effects of this invention are:

[0015] 1) It can achieve ultra-high temperature heating conditions above 2500K, providing the temperature environment required for thermal testing.

[0016] 2) Modular multi-nozzle flamethrowers and low fuel costs can significantly reduce the cost of thermal testing.

[0017] 3) The test piece has a wide range of adaptability to external dimensions and temperature environment, and can realize various types of thermal test.

[0018] 4) The device is easy to operate and can achieve rapid testing. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the high-temperature gas injection device used for thermal testing of the present invention.

[0020] Figure 2 This is a schematic diagram of a multi-nozzle flamethrower.

[0021] Figure 3 This is a schematic diagram of the water-cooled baffle.

[0022] Figure 4 This is a schematic diagram of the ribbed column structure.

[0023] Figure 5 This is a structural diagram of the various brackets connecting the motor.

[0024] Figure 6 This is a schematic diagram of the structure of the motor and crank.

[0025] In the diagram: 1 Water-cooled baffle, 2 Multi-nozzle flame injector, 3 Motor, 4 Slider guide rail, 5 Water outlet pipe, 6 Water inlet pipe, 11 Water inlet, 12 Water outlet, 13 Rib, 14 Rib column, 21 Nozzle, 22 Manifold box, 23 Oxyacetylene welding torch handle, 31 Crank, 81 Fixed bracket, 82 Movable bracket A, 83 Movable bracket B. Detailed Implementation

[0026] A high-temperature gas injection device for thermal testing includes a water-cooled baffle 1, a multi-nozzle flame injector 2, a motor 3, a water outlet pipe 5, and a water inlet pipe 6.

[0027] The multi-nozzle flame injector 2 includes nozzles 21, a manifold box 22, and a welding torch 23 connected in sequence. The welding torch 23 is connected to oxygen and acetylene gas pipelines respectively. A high-temperature gas injection device for thermal testing includes two or more multi-nozzle flame injectors 2, and each multi-nozzle flame injector 2 includes two or more nozzles 21 arranged in an array. Oxygen and acetylene gases are mixed in the welding torch 23, enter the manifold box 22, and then are ejected and burned through the nozzles 21. The welding torch 23 of a suitable model and specification is matched according to the number and model of the nozzles 21 to ensure that the flow rate meets the design requirements.

[0028] The water-cooled baffle 1 is located at the front of the nozzle 21. The interior of the water-cooled baffle 1 is divided by ribs 13 to form a coolant channel, which serves to prevent the flame from eroding the nozzle. An inlet 11 is located at the beginning of the coolant channel, connected to the inlet pipe 6; an outlet 12 is located at the end of the coolant channel, connected to the outlet pipe 5. Cylindrical ribs 14 are arranged inside the coolant channel, perpendicular to the direction of the water-cooled baffle 1. The inner surface of the cylindrical ribs 14 is in clearance fit with the nozzle 21, and the outer surface of the cylindrical ribs 14 is in contact with the coolant, thus protecting the nozzle and enhancing heat exchange. The coolant enters the interior of the water-cooled baffle 1 through the inlet pipe 6 and the inlet 11, is guided by the ribs 13, flows through the staggered cylindrical ribs 14, and finally flows out through the outlet 12 and the outlet pipe 5, thereby carrying away the heat from the water-cooled baffle 1. To better protect the nozzle and enhance heat exchange between the nozzle 21 and the cylindrical rib 14, a heat-conducting material can be filled between the nozzle 21 and the inner surface of the cylindrical rib 14.

[0029] There are two sets of motors 3. The two sets of motors 3 control the horizontal and vertical movement of the high-temperature gas injection device for thermal testing through cranks. When working, the motor drives the device to reciprocate in both vertical and horizontal directions through the slider guide rail 4, so as to achieve uniform heating of the test piece surface by the flame. A set of motors 3 is fixed on a fixed bracket 81, and its output end is connected to a crank 31. The eccentric shaft of the crank 31 engages with a horizontal slide groove on a movable bracket A82 to realize the horizontal reciprocating motion of the movable bracket A82. The slider on the movable bracket A82 is placed in a slider guide rail 4 set horizontally on the fixed bracket 81 to guide the horizontal reciprocating motion of the movable bracket A82. The movable bracket B83 is fixedly connected to the water-cooled baffle 1. Another set of motors 3 is fixed on the movable bracket B83, and its output end is connected to another crank 31. The eccentric shaft of the crank 31 engages with a vertical slide groove on the movable bracket A82 to realize the up-and-down reciprocating motion of the movable bracket B83. The slider on the movable bracket B83 is placed in a slider guide rail 4 set vertically on the movable bracket A82 to guide the vertical reciprocating motion of the movable bracket B83. (Because of the restriction of the fixed bracket 81, the movable bracket A82 cannot move up and down, only the movable bracket B83 can move up and down).

Claims

1. A high-temperature gas injection device for thermal testing, characterized in that, It includes a water-cooled baffle (1), a multi-nozzle flamethrower (2), a motor (3), a water outlet pipe (5), and a water inlet pipe (6); The multi-nozzle flame injector (2) includes a nozzle (21), a manifold box (22), and a welding torch (23) connected in sequence. The welding torch (23) is connected to oxygen and acetylene gas pipelines respectively. The water-cooled baffle (1) is located in front of the nozzle (21). The interior of the water-cooled baffle (1) is divided by ribs (13) to form a coolant channel. The beginning of the coolant channel is provided with an inlet (11), which is connected to the inlet pipe (6). The end of the coolant channel is provided with an outlet (12), which is connected to the outlet pipe (5). A cylindrical rib (14) is provided in the coolant channel, perpendicular to the direction of the water-cooled baffle (1). The inner surface of the rib (14) is in clearance fit with the nozzle (21), and the outer surface of the rib (14) is in contact with the coolant. The motor (3) consists of two sets, and the two sets of motors (3) control the horizontal and vertical movement of the high-temperature gas injection device for thermal testing through cranks.

2. The high-temperature gas injection device for thermal testing according to claim 1, characterized in that, A high-temperature gas jetting device for thermal testing includes two or more multi-nozzle flame jetters (2), and a multi-nozzle flame jetter (2) includes two or more nozzles (21), which are arranged in an array. Oxygen and acetylene gases are mixed in the welding torch (23) and then enter the manifold (22) before being ejected and burned through the nozzles (21). A welding torch (23) of suitable model and specification is matched according to the number and model of the nozzles (21) to ensure that the flow rate meets the design requirements.

3. The high-temperature gas injection device for thermal testing according to claim 1, characterized in that, A thermally conductive material is filled between the nozzle (21) and the inner surface of the rib (14).

4. The high-temperature gas injection device for thermal testing according to claim 1, characterized in that, A set of motors (3) are fixed on a fixed bracket (81), and the output end is connected to a crank (31). The eccentric shaft of the crank (31) is engaged with the horizontal slide groove on the movable bracket A (82) to realize the horizontal reciprocating motion of the movable bracket A (82). The slider set on the movable bracket A (82) is placed in the slider guide rail (4) set on the fixed bracket (81) in the horizontal direction, which guides the horizontal reciprocating motion of the movable bracket A (82); the movable bracket B (83) and the water-cooled baffle Plate (1) is fixedly connected, and another set of motors (3) is fixed on the movable bracket B (83), and the output end is connected to another crank (31). The eccentric shaft of the crank (31) is engaged with the vertical slide groove on the movable bracket A (82) to realize the up-and-down reciprocating motion of the movable bracket B (83). The slider set on the movable bracket B (83) is placed in the slider guide rail (4) set on the movable bracket A (82) in the vertical direction, which plays a guiding role in the vertical reciprocating motion of the movable bracket B (83).

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