Reusable standard ignition powder block combustion performance testing device
By designing a reusable ignition charge combustion performance testing device, the problems of ignition charge ejection and difficulty in replacing electric ignition tubes were solved, realizing low-cost and high-efficiency ignition charge combustion performance measurement and supporting engine optimization design.
Patent Information
- Application Number
- CN202511081475.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-04
- Publication Date
- 2025-11-04
AI Technical Summary
In existing technologies, the ignition propellant flies out of the nozzle, the electric ignition tube is not easy to replace, and it damages the casing, resulting in high testing costs, low efficiency, and difficulty in measuring the combustion performance of the ignition propellant.
Design a reusable standard ignition charge combustion performance testing device, including a shell, top cover, baffle plate, electric ignition tube, bottom cover and flange base. The electric ignition tube is fixed by threaded connection and hardened adhesive. The baffle plate is set to prevent the ignition charge from flying out. A pressure sensor is equipped to measure the combustion pressure. Stainless steel material is used to improve the robustness and reliability of the device.
It enables rapid replacement of electric ignition tubes, reduces testing costs, ensures the reliability and measurement accuracy of the device, and can measure performance parameters such as ignition delay time, flame morphology and combustion temperature, supporting the optimized design of the annular ignition device for two-pulse engines.
Smart Images
Figure CN120889683A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of solid rocket engine ignition testing technology, specifically to a reusable standard ignition charge combustion performance testing device. Background Technology
[0002] Solid rocket motors, with their advantages of simple structure, low cost, good storage life, and easy maintenance, are widely used in aerospace equipment. Ignition is a crucial stage in the operation of a solid rocket motor; its reliability and safety affect the normal operation of the motor and are important criteria for evaluating its quality. The solid rocket motor ignition system mainly includes an ignition tube, ignition propellant, ignition circuitry, mounting base, and ignition cartridge. Common ignition propellants include black powder, boron / potassium nitrate (B / KNO3), and magnesium / polytetrafluoroethylene (Mg / PTFE). The ignition tube ignites the ignition propellant, which burns rapidly, producing a large amount of incandescent gas and particles that surround and heat the surface of the propellant, igniting it and quickly establishing a stable combustion phase and normal operating pressure.
[0003] The cryogenic, low-pressure, quasi-open, and large free-volume operating environment of current soft-septum dual-pulse solid rocket motors is a significant concern. Inadequate design of the two-pulse engine ignition device can lead to propellant and ignition charge extinguishing or misfiring, resulting in severe ignition delays and even failure to ignite. Currently, two-pulse engine ignition devices typically employ an annular ignition cartridge containing multiple ignition charge blocks, sometimes even combinations of different types, with multiple evenly distributed annular nozzles on the exterior. However, during ignition cartridge performance studies using internal pressure tests, the small spacing between adjacent nozzles in the annular cartridge causes the emitted flames to mix, hindering flame morphology observation and making it difficult to measure the combustion performance of the ignition charge. Furthermore, as the ignition charge gradually decreases in size during combustion, it may eject along the nozzle diameter when smaller, further impacting flame observation. Currently, there are no reports on dedicated testing devices for standard ignition charge combustion performance. Therefore, it is necessary to design a reusable standard ignition charge combustion performance testing device to prevent ignition charge from flying out during combustion, enable rapid replacement of the electric ignition tube, avoid damage to the casing, and study the combustion performance of the ignition charge under low temperature and low pressure conditions, measuring ignition pressure, ignition delay time, flame morphology, combustion temperature, etc., to provide a reference for the optimized design of the annular ignition device of the future two-pulse engine. Summary of the Invention
[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a reusable standard ignition block combustion performance testing device, which can solve the problems of high testing cost and low efficiency caused by the ignition charge flying out of the nozzle, the electric ignition tube being difficult to replace, and the shell being damaged and requiring replacement with a new shell.
[0005] The reusable standard ignition block combustion performance testing device of the present invention includes a shell, a top cover, a baffle plate, an electric ignition tube, a bottom cover, and a flange base. The shell has a through-hole, which is divided into an upper channel, a middle channel, and a lower channel. The top cover covers the upper channel and has a through-hole for ignition. The bottom cover covers the lower channel and has a through-hole for insertion. The electric ignition tube is inserted into the hole, and the electric ignition tube is fixed by injecting a two-liquid mixed hardening adhesive into the hole. The fire tube is fixed and the insertion hole is sealed. A bracket is set in the middle channel to form a place for the ignition block. The baffle plate is cross-shaped and is placed in the middle channel between the bracket and the top cover. The upper end of the electric ignition tube extends into the middle channel until the place for the ignition block. The flange base includes two mounting plates and an upwardly bent protrusion connected between the two mounting plates. The protrusion has a through hole that runs vertically through the top and bottom. The bottom of the housing is installed on the protrusion of the flange base. The lower end of the electric ignition tube extends out from the through hole. After the ignition block is placed in the ignition block placement position, the baffle plate is located between the ignition block and the top cover. When the ignition block is ignited, the baffle plate prevents the ignition powder from being ejected from the flame hole of the top cover.
[0006] Preferably, the top cover is threaded onto the upper channel, the bottom cover is fixed to the housing with screws, and the housing is fixed to the flange base with screws. This facilitates the opening and closing of the top cover, thereby facilitating the replacement of the ignition block or the top cover for different diameter flame holes. In addition, it facilitates the removal of the bottom cover for replacement with a new bottom cover for the ignition tube.
[0007] Preferably, the top surface of the top cover has a groove for inserting a screwdriver tip. This allows for quick and easy installation or removal of the top cover using a screwdriver.
[0008] Preferably, the housing has two pressure sensor mounting holes that communicate with the central channel. This allows for convenient measurement of the pressure during combustion of the propellant block inside the housing after the pressure sensor is installed.
[0009] Preferably, the bracket includes multiple L-shaped blocks, each evenly distributed along the peripheral wall of the central channel. This facilitates the stable placement of the ignition charge inside the housing.
[0010] Preferably, the edges of each end of the deflector plate are arc-shaped to mate with the peripheral wall of the channel in the housing. This ensures that the deflector plate can stably perform its deflecting function.
[0011] Preferably, the bottom cover includes an integrally machined circular base plate and a protruding rod connected to the upper surface of the base plate. The upper end of the insertion hole opens onto the top surface of the protruding rod, and the lower end opens onto the bottom surface of the base plate. The protruding rod is formed by connecting an upper rod section with a smaller outer diameter and a lower rod section with a larger outer diameter. The upper rod section, the lower rod section, and the base plate form a stepped shaft. The lower channel of the housing is stepped and mates with the stepped shaft. A sealing ring groove is provided along the outer peripheral wall of the upper rod section, and a sealing ring is installed in the sealing ring groove. Two first screw holes are provided at the bottom of the housing, and two corresponding first mounting holes are provided on the base plate. The base plate is fastened to the housing with screws. This ensures the sealing performance, pressure resistance, and installation reliability of the bottom cover to the housing.
[0012] Preferably, two second mounting holes are provided on the protruding part of the flange base, and two corresponding second screw holes are provided on the bottom of the housing. The flange base is fastened to the housing with screws. The two second mounting holes are symmetrically distributed on both sides of the through hole. A through strip hole is provided on each of the two mounting plates of the flange base for mounting the flange base onto the test bench with a honeycomb plate structure using screws that are compatible with the threaded holes of the test bench. This ensures the installation reliability of the flange base, housing, and test bench, and improves the adaptability of the testing device to the installation environment.
[0013] Preferably, the housing, top cover, baffle plate, bottom cover, and flange base are all made of stainless steel. This makes the device robust and reliable.
[0014] Beneficial effects: The reusable standard ignition block combustion performance testing device of the present invention allows for the replacement of the electric ignition tube along with the bottom cover, enabling other components to be reused, reducing testing costs. Simultaneously, the testing operation is simple; a baffle plate prevents ignition propellant from flying out of the nozzle. By threading the top cover onto the upper channel, fixing the bottom cover to the housing with screws, and fixing the housing to the flange base with screws, the top cover can be easily opened and closed, facilitating the replacement of ignition blocks or top covers with different nozzle diameters. Furthermore, it allows for easy removal of the bottom cover for replacement with a new bottom cover containing the electric ignition tube. A groove on the top surface of the top cover facilitates quick and easy installation and removal using a screwdriver. Two pressure sensor mounting holes are provided on the housing, communicating with the central channel, allowing for the installation of pressure sensors. This device facilitates the measurement of pressure distribution during the combustion of propellant blocks within the casing. By including multiple L-shaped supports evenly distributed along the perimeter of the central channel, it ensures stable placement of the propellant blocks inside the casing. The arc-shaped edges of the baffle plates ensure their stable propellant-blocking function. The well-designed bottom cover structure and the inclusion of sealing rings ensure the bottom cover's sealing performance, pressure resistance, and installation reliability. The optimized flange base structure ensures reliable installation between the flange base and the casing / test bench, improving the device's adaptability to various installation environments. The use of stainless steel for the casing, top cover, baffle plates, bottom cover, and flange base ensures a robust and reliable device. Furthermore, it allows for easy acquisition of performance parameters such as ignition delay time, flame morphology, and combustion temperature by photographing the flame above the ignition port using testing instruments. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the reusable standard ignition block combustion performance testing device of the present invention; Figure 2 This is a partial cross-sectional schematic diagram of the reusable standard ignition block combustion performance testing device of the present invention; Figure 3 This is a cross-sectional schematic diagram of the reusable standard ignition block combustion performance testing device of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the shell; Figure 5 This is a schematic diagram of the cross-sectional structure of the top cover; Figure 6 This is a schematic diagram of the structure of the medicine-blocking plate; Figure 7 This is a schematic diagram of the cross-sectional structure of the bottom cover; Figure 8 This is a top view of the flange base. In the diagram, 1. Housing; 11. Pressure sensor mounting hole; 12. Upper channel; 13. Middle channel; 14. Lower channel; 2. Flange base; 21. Mounting piece; 22. Protrusion; 23. Strip hole; 24. Through hole; 25. Second mounting hole; 3. Top cover; 31. Groove; 32. Flame hole; 4. Baffle plate; 5. Bracket; 51. Vertical rod; 52. Horizontal rod; 6. Bottom cover; 61. Sealing ring; 62. Upper rod section; 63. Lower rod section; 64. Base plate; 65. Sealing ring groove; 66. Upper side hole section; 67. Lower side hole section; 7. Electric ignition tube; 8. Two-liquid mixed hardening adhesive. Detailed Implementation
[0016] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments.
[0017] like Figure 1-8 As shown, the present invention is a reusable standard ignition block combustion performance testing device, comprising a housing 1, a top cover 3, a baffle plate 4, an electric ignition tube 7, a bottom cover 6, and a flange base 2, wherein the housing 1, the top cover 3, the baffle plate 4, the bottom cover 6, and the flange base 2 are all made of stainless steel.
[0018] like Figure 1-4 As shown, the housing 1 has a through-hole, which is divided into an upper through-hole 12, a middle through-hole 13, and a lower through-hole 14. The inner wall of the upper through-hole 12 is threaded. The outer surface of the housing 1 is shaped by cutting two symmetrical planes on the circumference. A pressure sensor mounting hole 11 is opened on each of the two symmetrical planes, and the pressure sensor mounting hole 11 communicates with the middle through-hole 13.
[0019] like Figure 1 , Figure 5 As shown, the outer circumferential surface of the top cover 3 is threaded, and the top cover 3 and the upper channel 12 are threadedly connected; the top cover 3 has a flame hole 32 that runs through the top and bottom, and the top surface of the top cover 3 has a groove 31 for fitting a screwdriver tip.
[0020] like Figure 3 , Figure 7As shown, the bottom cover 6 includes a circular bottom plate 64 and a protruding rod integrally formed on the upper surface of the bottom plate 64. A through-hole is formed from the top surface of the protruding rod to the bottom surface of the bottom plate 64. The protruding rod is formed by connecting an upper rod section 62 with a smaller outer diameter and a lower rod section 63 with a larger outer diameter. The upper rod section 62, the lower rod section 63, and the bottom plate 64 form a stepped shaft. The lower channel 14 of the housing 1 is stepped and mates with this stepped shaft. The aforementioned through-hole is divided into an upper side hole section 66 and a lower side hole section 67 connected together. The connection point between the upper side hole section 66 and the lower side hole section 67 is located in the upper middle part of the lower rod section 63. The diameter of the lower side hole section 67 is larger than the diameter of the upper side hole section 66, allowing for the injection of a two-component mixed hardening adhesive 8 into the lower side hole section 67. A sealing ring groove 65 is provided along the outer peripheral wall of the upper rod section 62 of the protruding rod, and a sealing ring 61 is installed in the sealing ring groove 65. The bottom of the housing 1 has two first screw holes, and the base plate 64 has two corresponding first mounting holes. After inserting the stepped shaft bottom cover 6 into the stepped lower channel 14, the base plate 64 is fastened to the housing 1 by M3×0.5 socket head cap screws.
[0021] The electric ignition tube 7 is inserted into the socket, and the electric ignition tube 7 is fixed and the socket is sealed by injecting a two-component mixed hardening adhesive 8 into the lower side section 67 of the socket; the two-component mixed hardening adhesive 8 can be applied with reference to the prior art in this field.
[0022] like Figure 4 As shown, a bracket 5 is provided in the central channel 13. The bracket 5 includes four L-shaped blocks. Each L-shaped block is formed vertically and integrally by a vertical rod 51 and a horizontal rod 52. Each vertical rod 51 is evenly distributed along the periphery of the central channel 13 and integrally formed with the inner periphery of the central channel 13. The top surfaces of each horizontal rod 52 are all on the same horizontal plane to form a place for the ignition block. The baffle plate 4 is cross-shaped (e.g., ...). Figure 6 As shown, the edges of each end of the baffle plate 4 are arc-shaped to mate with the periphery of the central channel 13 of the housing 1. The four ends of the baffle plate 4 are supported by the tops of four vertical rods 51. That is, the baffle plate 4 is placed in the central channel 13 and located between the bracket 5 and the top cover 3. The upper end of the electric ignition tube 7 extends into the central channel 13 until it reaches the ignition block placement position. After the ignition block is placed in the ignition block placement position, the baffle plate 4 is located between the ignition block and the top cover 3. When the ignition block is ignited, the baffle plate 4 prevents the ignition powder from being ejected from the flame hole 32 of the top cover 3.
[0023] like Figure 1-3 , Figure 8As shown, the flange base 2 includes two mounting pieces 21 and an upwardly bent protrusion 22 welded between the two mounting pieces 21. The protrusion 22 has a through hole 24 extending vertically. The bottom of the housing 1 is mounted on the protrusion 22 of the flange base 2, and the lower end of the electric ignition tube 7 extends out from the through hole 24. Two second mounting holes 25 are also provided on the protrusion 22 of the flange base 2, and two corresponding second screw holes are provided on the bottom of the housing 1. The flange base 2 is fastened to the housing 1 with M8×1.25 hexagon socket screws. The two second mounting holes 25 are symmetrically distributed on both sides of the through hole 24. A through strip hole 23 is provided on each of the two mounting pieces 21 of the flange base 2 as a slide rail groove, which is used to assemble the flange base 2 onto the test bench with a honeycomb plate structure using screws that are compatible with the threaded holes of the test bench. This can improve the freedom of the electric ignition tube 7 and the adaptability of the test device installation environment.
[0024] The working process of this invention is as follows.
[0025] The bottom cover 6 of the reusable standard ignition block combustion performance testing device is filled with an electric ignition tube 7 and then filled with a two-component mixed hardening adhesive 8 for more than two hours. The bottom cover 6 with the electric ignition tube 7, the top cover 3, the ignition block, and the baffle plate 4 are then assembled into the housing 1. After the housing 1 is assembled with the flange base 2, the entire testing device is installed on the test bench. A pressure sensor is installed, and the charge in the housing 1 is ignited by electric ignition through the electric ignition tube 7, producing a flame and high-temperature and high-pressure gas. The pressure data in the housing 1 is measured by the pressure sensor. At the same time, the flame above the ignition hole 32 is measured by an optical-electric measurement system to obtain the ignition delay time and combustion time. The flame morphology is obtained by taking pictures of the flame using a high-speed camera, and the combustion temperature is calculated by measuring the flame spectrum using a fiber optic spectrometer.
[0026] Unless otherwise specified, all technologies mentioned above refer to existing technologies.
[0027] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification.
Claims
1. A reusable standard ignition charge combustion performance testing device, characterized in that, The device includes a housing (1), a top cover (3), a baffle plate (4), an electric ignition tube (7), a bottom cover (6), and a flange base (2). The housing (1) has a through-hole, which is divided into an upper through-hole (12), a middle through-hole (13), and a lower through-hole (14). The top cover (3) covers the upper through-hole (12) and has a through-hole (32). The bottom cover (6) covers the lower through-hole (14) and has an insertion hole. The electric ignition tube (7) is inserted into the insertion hole and is fixed and sealed by injecting a two-liquid mixed hardening adhesive (8) into the insertion hole. A bracket (5) is provided in the middle through-hole (13) to form a place for the ignition block. The baffle plate (4) is cross-shaped and is placed on the middle through-hole. The middle channel (13) is located between the bracket (5) and the top cover (3). The upper end of the electric ignition tube (7) extends into the middle channel (13) until the ignition block placement position. The flange base (2) includes two mounting plates (21) and an upwardly bent protrusion (22) connected between the two mounting plates (21). The protrusion (22) has a through hole (24) that runs vertically through the top and bottom. The bottom of the housing (1) is mounted on the protrusion (22) of the flange base (2). The lower end of the electric ignition tube (7) extends out from the through hole (24). After the ignition block is placed in the ignition block placement position, the baffle plate (4) is located between the ignition block and the top cover (3). When the ignition block is ignited, the baffle plate (4) prevents the ignition powder from being sprayed out from the flame hole (32) of the top cover (3).
2. The reusable standard ignition block combustion performance testing device according to claim 1, characterized in that, The top cover (3) is threaded onto the upper channel (12), the bottom cover (6) is fixed to the housing (1) by screws, and the housing (1) is fixed to the flange base (2) by screws.
3. The reusable standard ignition block combustion performance testing device according to claim 2, characterized in that, The top surface of the top cover (3) has a groove (31) for inserting a screwdriver tip.
4. The reusable standard ignition block combustion performance testing device according to claim 3, characterized in that, Two pressure sensor mounting holes (11) are provided on the housing (1), and the pressure sensor mounting holes (11) are connected to the central channel (13).
5. The reusable standard ignition block combustion performance testing device according to claim 4, characterized in that, The bracket (5) includes multiple L-shaped blocks, each of which is evenly distributed along the periphery of the central channel (13).
6. The reusable standard ignition block combustion performance testing device according to claim 5, characterized in that, The edges of each end of the baffle plate (4) are arc-shaped to fit with the periphery of the central channel (13) of the shell (1).
7. The reusable standard ignition block combustion performance testing device according to claim 6, characterized in that, The bottom cover (6) includes a circular bottom plate (64) and a protruding rod fixed to the upper surface of the bottom plate (64). The upper end of the insertion hole opens to the top surface of the protruding rod, and the lower end opens to the bottom surface of the bottom plate (64). The protruding rod is formed by connecting an upper rod section (62) with a smaller outer diameter and a lower rod section (63) with a larger outer diameter. The upper rod section (62), the lower rod section (63) and the bottom plate (64) form a stepped shaft. The lower channel (14) of the housing (1) is stepped and matches the stepped shaft. A sealing ring groove (65) is provided along the outer peripheral wall of the upper rod section (62) of the protruding rod. A sealing ring (61) is installed in the sealing ring groove (65). Two first screw holes are opened at the bottom of the housing (1), and two corresponding first mounting holes are opened on the bottom plate (64). The bottom plate (64) and the housing (1) are fastened by screws.
8. The reusable standard ignition block combustion performance testing device according to claim 7, characterized in that, Two second mounting holes (25) are also provided on the protrusion (22) of the flange base (2), and two corresponding second screw holes are also provided on the bottom of the housing (1). The flange base (2) and the housing (1) are fastened together by screws. The two second mounting holes (25) are symmetrically distributed on both sides of the through hole (24). A through strip hole (23) is provided on each of the two mounting pieces (21) of the flange base (2) for using screws that are compatible with the threaded holes of the test bench to assemble the flange base (2) onto the test bench with a honeycomb plate structure.
9. The reusable standard ignition block combustion performance testing device according to claim 8, characterized in that, The shell (1), top cover (3), medicine baffle (4), bottom cover (6), and flange base (2) are all made of stainless steel.