Solid powder pre-combustion assembly and heater assembly

Abstract

The invention provides a solid powder pre-combustion assembly and a heater assembly, comprising: a fluid interconnection device having a first interface for receiving fluidized powder fuel, a second interface for receiving fluidized powder fuel, and a third interface for receiving fluidized powder fuel; the first fuel gas generator is used for receiving auxiliary gas and generating high-temperature fuel gas, and a gas outlet of the fuel gas generator is communicated with the second connector of the fluid interconnection device; and an inlet of the pre-combustion chamber communicates with the third connector, and the pre-combustion chamber is used for receiving high-temperature fuel gas and powder fuel, conducting pre-combustion and removing a surface oxidation layer of the powder fuel. Compared with the prior art, the solid powder pre-combustion assembly and the heater assembly are simple in structure, and the solid powder combustion completeness and combustion efficiency can be improved.

Description

Technical Field

[0001] This invention relates to the field of solid powder combustion engine technology, and more particularly to a solid powder pre-combustion assembly and a heater assembly. Background Technology

[0002] Solid powder ramjet engines use high-energy metal powders (such as aluminum powder, magnesium powder, etc.) or boron powder as their main fuel. They have advantages such as high specific impulse, relatively simple structure, and stable fuel storage, and have significant application potential in high-speed propulsion systems.

[0003] Under normal conditions, a dense oxide layer (such as aluminum oxide or boron oxide) easily forms on the surface of metal powder particles. This oxide layer hinders direct contact between the internal active metal and the oxidant, significantly inhibiting the initiation and propagation of the combustion reaction. Under high-speed airflow conditions, the rupture and peeling of the oxide layer on the particle surface becomes even more difficult, further exacerbating the difficulty of ignition and combustion organization.

[0004] Furthermore, because the combustion of solid powder involves multiple coupled processes such as particle dispersion, heating, phase change, and diffusion combustion, achieving instantaneous, comprehensive, and synchronous ignition is extremely difficult. Traditional solutions typically rely on high-energy, high-intensity ignition sources, such as high-power laser ignition, high-temperature plasma jets, or chemically enhanced igniters, to rapidly raise the powder particles to ignition temperature by releasing a large amount of concentrated energy, thus overcoming the aforementioned obstacles. However, these methods pose significant challenges to the power, high-temperature resistance, and system integration of the ignition device, and may also lead to increased system complexity and reduced reliability. Summary of the Invention

[0005] To address the technical problem of the difficulty in instantaneous and complete ignition of solid powders in existing technologies, this invention provides a solid powder pre-combustion assembly and a heater assembly, which have a simple structure and can improve the completeness and efficiency of solid powder combustion.

[0006] A solid powder pre-combustion assembly, comprising: A fluid interconnection device having a first interface, a second interface and a third interface, wherein the first interface is used to receive fluidized powdered fuel; A first gas generator is used to receive auxiliary gas to generate high-temperature gas, and the gas outlet of the gas generator is connected to the second interface of the fluid interconnection device. The pre-combustion chamber has its inlet connected to the third interface. The pre-combustion chamber is used to receive high-temperature gas and powdered fuel and pre-combust them to remove the surface oxide layer of the powdered fuel.

[0007] Preferably, the first gas generator includes: The main body with a built-in combustion chamber; An auxiliary gas supply assembly is located at the front end of the main body and communicates with the combustion chamber, for supplying auxiliary gas into the combustion chamber; An ignition device is disposed in the combustion chamber; The outlet section is connected to the rear end of the main body section, and an outlet channel is provided inside the outlet section, the inner diameter of the outlet channel gradually narrows.

[0008] Preferably, the gas supply assembly includes: The injection panel is fixedly connected to the front end of the main body, and the injection panel is provided with mounting holes. A first cavity is fixedly disposed at the front end of the injection panel. A first chamber is formed between the first cavity and the injection panel. A first channel is formed between the first cavity and the inner wall of the mounting hole. The first channel is used to connect the first cavity and the combustion chamber. A first air intake connector communicating with the first chamber is provided on the first cavity. The second cavity is fixedly disposed at the front end of the first cavity, and a second chamber is formed between the second cavity and the first cavity. The second chamber is connected to the combustion chamber, and a second air intake connector connected to the second chamber is provided on the second cavity.

[0009] Preferably, the body portion includes: A first housing, wherein the combustion chamber is disposed within the first housing; A connecting plate is fixedly connected to the rear end of the first housing; The second housing is fitted onto the outside of the first housing, and the second housing is fixedly connected to the connecting plate. A first cooling cavity is formed between the second housing, the connecting plate, and the first housing. The first cooling inlet is located at the front end of the second housing and communicates with the first cooling cavity; The first cooling outlet is located at the rear end of the second housing and communicates with the first cooling cavity.

[0010] Preferably, the outlet section includes: An inner sleeve is fixedly installed at the rear end of the connecting disc, and the inner diameter of the inner sleeve gradually decreases. An outer sleeve is fitted over the outer side of the inner sleeve and is fixedly connected to the connecting plate. A second cooling chamber is formed between the connecting plate, the outer sleeve, and the inner sleeve. The outer sleeve is provided with a second cooling inlet and a second cooling outlet.

[0011] Preferably, the pre-combustion chamber comprises: A pre-combustion chamber, the inlet of which is connected to the third connector, and the inner diameter of the outlet section of the pre-combustion chamber gradually decreases; The first temperature measuring point is connected to the pre-combustion chamber and is used to detect the temperature inside the pre-combustion chamber; The second pressure measuring point is connected to the pre-combustion chamber and is used to detect the pressure in the pre-combustion chamber.

[0012] A heater assembly comprising the solid powder pre-combustion assembly described in any one of the preceding claims; A connecting pipe is provided with a first inlet, a second inlet, and a discharge port. The first inlet is connected to the outlet of the solid powder pre-combustion assembly, and the discharge port is used to communicate with the engine combustion chamber. The heater has its outlet connected to the second inlet for supplying oxygen-enriched gas into the connecting pipe.

[0013] Preferably, the heater comprises: Second gas generator; A gas outlet connector is connected to the rear end of the second gas generator, and the outlet of the gas outlet connector is used to communicate with the second inlet; in, The gas outlet connector includes: a nozzle, which gradually increases in diameter in a direction away from the second gas generator; or, The air outlet connector includes: A gas-receiving chamber is used to receive the mixed gas output from the second gas generator; The third pressure measuring point is used to detect the air pressure in the gas chamber; The second temperature measuring point is used to detect the temperature inside the gas chamber; A flow controller is installed at the outlet of the gas chamber to regulate the output gas flow rate.

[0014] Preferably, the heater further includes: A flow divider connector is connected to the combustion chamber of the second gas generator; A plug is fitted onto the outside of the diverter, and the plug is detachably connected to the diverter.

[0015] Preferably, it further includes: The third inlet is located on the connecting pipe; A connecting pipe is used to connect the third inlet to the diversion connector.

[0016] Compared with existing technologies, the solid powder pre-combustion assembly provided by this invention, firstly, incorporates a fluid interconnection device, a first gas generator, and a pre-combustion chamber. The fluid interconnection device has a first interface, a second interface, and a third interface. The first interface receives fluidized powdered fuel, the second interface connects to the first gas generator, and the third interface connects to the inlet of the pre-combustion chamber. The first gas generator receives auxiliary gas and generates high-temperature gas. The fluid interconnection device receives the high-temperature gas and fluidized fuel powder and feeds them into the pre-combustion chamber for pre-combustion to remove the surface oxide layer on the fuel powder. By pre-combusting the surface oxide layer of the solid fuel powder through the solid powder pre-combustion assembly, it achieves good ignition performance during secondary combustion, improving the completeness and efficiency of solid powder combustion. Therefore, the solid powder pre-combustion assembly provided by this invention, by pre-combusting solid fuel powder to remove the oxide layer on the surface of powder particles, has a simple structure and can improve the completeness and efficiency of solid powder combustion.

[0017] The present invention also provides a heater assembly, including a connecting pipe, a heater, and a solid powder pre-combustion assembly. The connecting pipe has a first inlet, a second inlet, and a discharge port. The first inlet is connected to the solid powder pre-combustion assembly, and the second inlet is connected to the heater. The heater outputs oxygen-enriched gas into the connecting pipe, and the discharge port of the connecting pipe is connected to the engine combustion chamber. Because the solid powder pre-combustion assembly is provided to pre-combust the solid powder to remove the oxide layer on the surface of the solid powder, it is then mixed with the oxygen-enriched gas and subjected to secondary combustion in the engine combustion chamber, so that the solid powder is burned more completely and the combustion efficiency is higher. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a solid powder pre-combustion assembly provided in an embodiment of the present invention; Figure 2 for Figure 1 A structural schematic diagram of a cross-sectional view; Figure 3 This is a schematic diagram of a first gas generator provided in an embodiment of the present invention; Figure 4 for Figure 3 A structural schematic diagram of a cross-sectional view; Figure 5This is a schematic diagram of a first structure of a heater provided in an embodiment of the present invention; Figure 6 for Figure 5 A structural schematic diagram of a cross-sectional view; Figure 7 This is a schematic diagram of a second structure of the heater provided in an embodiment of the present invention; Figure 8 for Figure 7 A structural schematic diagram of a cross-sectional view; Figure 9 This is a schematic diagram of a first structure of the heater assembly provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of a second structure of the heater assembly provided in an embodiment of the present invention.

[0020] Reference numerals: 1. Fluid interconnection device; 2. First gas generator; 3. Pre-combustion chamber; 4. Connecting pipe; 5. Heater; 21. Combustion chamber; 22. Main body; 23. Gas supply assembly; 24. Ignition device; 25. Outlet; 221. First housing; 222. Connecting plate; 223. Second housing; 224. First cooling chamber; 225. First cooling inlet; 226. First cooling outlet; 227. First pressure measuring point; 231. Injection panel; 232. First cavity; 233. First air inlet connector; 234. Second cavity; 235. Second air inlet connector; 251. Inner sleeve; 252. Outer sleeve; 253. Second cooling chamber; 254. Second cooling inlet; 255. Second cooling outlet; 31. Pre-combustion chamber; 32. First temperature measuring point; 33. Second pressure measuring point; 51. Second gas generator; 521. Nozzle; 522. Gas storage chamber; 523. Third pressure measuring point; 524. Second temperature measuring point; 525. Flow controller; 53. Diverter; 54. Connecting pipe. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0023] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0024] like Figures 1 to 4 As shown, the present invention provides a solid powder pre-combustion assembly, comprising: a fluid interconnection device 1 having a first interface, a second interface, and a third interface, the first interface being used to receive fluidized powder fuel; a first gas generator 2 being used to receive auxiliary gas to generate high-temperature gas, the outlet of the gas generator being connected to the second interface of the fluid interconnection device 1; and a pre-combustion chamber 3 having its inlet connected to the third interface, the pre-combustion chamber 3 being used to receive high-temperature gas and powder fuel and perform pre-combustion to remove the surface oxide layer of the powder fuel.

[0025] In existing technologies, solid powders are often directly fed into the combustion chamber of a ramjet engine for ignition. However, the high airflow velocity in the ramjet combustion chamber requires an extremely short ignition delay time. Under normal conditions, a dense oxide layer (such as aluminum oxide or boron oxide) easily forms on the surface of metal powder particles. This oxide layer hinders direct contact between the internal active metal and the oxidant, significantly inhibiting the initiation and propagation of the combustion reaction. Under high-speed airflow conditions, the breaking and peeling of the oxide layer on the particle surface becomes even more difficult, further exacerbating the challenges of ignition and combustion organization.

[0026] To address the problem of insufficient instantaneous and complete ignition of solid fuel powder in existing technologies, this invention provides a solid fuel powder pre-combustion assembly. Firstly, it incorporates a fluid interconnection device 1, a first gas generator 2, and a pre-combustion chamber 3. The fluid interconnection device 1 has a first interface, a second interface, and a third interface. The first interface receives fluidized fuel powder, the second interface connects to the first gas generator 2, and the third interface connects to the inlet of the pre-combustion chamber 3. The first gas generator 2 receives auxiliary gas and generates high-temperature gas. The fluid interconnection device 1 receives the high-temperature gas and the fluidized fuel powder and feeds them into the pre-combustion chamber 3 for pre-combustion to remove the surface oxide layer on the fuel powder. By pre-combusting the surface oxide layer of the solid fuel powder through the solid fuel powder pre-combustion assembly, it achieves good ignition performance during secondary combustion, improving the completeness and efficiency of solid fuel combustion. Therefore, the solid fuel powder pre-combustion assembly provided by this invention, by pre-combusting solid fuel powder to remove the oxide layer on the surface of powder particles, has a simple structure and can improve the completeness and efficiency of solid fuel combustion.

[0027] Furthermore, in this embodiment of the invention, the powdered fuel is fluidized by a protective gas. After being fluidized by the protective gas, the powdered fuel is transported to the pre-combustion chamber 3 to prevent the powdered fuel from burning directly in the fluid interconnection device 1. In addition, the fluidized powdered fuel can be quickly and uniformly mixed with the high-temperature gas to achieve stable and continuous pre-combustion. The fluidization process disperses the powdered fuel particles, which greatly increases the surface area of ​​the powdered fuel participating in pre-combustion, making the surface oxide layer burn more quickly and completely.

[0028] More specifically, the protective gas in the embodiments of the present invention includes, but is not limited to, helium, argon, and nitrogen. Nitrogen is preferred because it has the lowest cost and the widest availability.

[0029] More specifically, the fluid interconnection device 1 in this embodiment of the invention is a tee connector.

[0030] In the above structure, as one embodiment, the first gas generator 2 in this invention includes a body 22, a gas supply component 23, an ignition device 24, and an outlet 25. The body 22 contains a combustion chamber 21. The gas supply component 23 is located at the front end of the body 22 and communicates with the combustion chamber 21 to supply gas to the combustion chamber 21. The ignition device 24 is located in the combustion chamber 21 and ignites the gas to generate high-temperature gas. The high-temperature gas is slightly oxygen-rich. The outlet 25 is connected to the rear end of the body 22 and contains an outlet channel with a gradually narrowing inner diameter. This is to ensure the total pressure parameter in the gas generator and to infer the difficult-to-measure total temperature parameter of the combustion chamber from the total pressure and total gas flow parameters. It also forms a throttling effect, reducing the impact of downstream pressure fluctuations on the working state of the gas generator. The purpose is not to accelerate the gas injection speed, but to use a smaller inner diameter pipe in the three-way pipe to increase the gas flow rate in the pipe and reduce the static pressure in the pipe, so as to form a certain entraining effect on the fluidized powder, and then enter the pre-combustion chamber to reduce the flow rate, so that the powder has a longer heat transfer contact time with the high temperature gas, and finally enters the combustion chamber of the test section for combustion.

[0031] While the high-temperature gas exchanges heat with the solid powder fuel in the pre-combustion chamber 3, it can also cause the oxide layer on the surface of the powder fuel to undergo a combustion reaction, thereby removing the oxide layer and further increasing the temperature.

[0032] In the above structure, as one embodiment, the gas supply component 23 of this invention includes an injection panel 231, a first cavity 232, and a second cavity 234. The injection panel 231 is fixedly connected to the front end of the main body 22, and has a mounting hole. The first cavity 232 is disposed at the front end of the injection panel 231 and is fixedly connected to the injection panel 231. A first chamber is formed between the first cavity 232 and the injection panel 231. A first channel is formed between the first cavity 232 and the inner wall of the mounting hole. The first channel connects the first chamber and the combustion chamber 21. A first air inlet connector 233 is provided on the cavity 232. The first air inlet connector 233 is used to communicate with the first chamber and to input a first gas into the first chamber. A second cavity 234 is provided at the front end of the first cavity 232 and is fixedly connected to the first cavity 232. A second chamber is formed between the second cavity 234 and the first cavity 232. The second chamber is connected to the combustion chamber 21. A second air inlet connector 235 is provided on the second cavity 234 and is connected to the combustion chamber 21. The second air inlet connector 235 is used to supply a second gas into the second chamber. The first gas and the second gas are mixed and ignited in the combustion chamber 21.

[0033] In the above structure, as one embodiment, the ignition device 24 in this embodiment of the invention includes a sleeve and a spark plug. The first cavity 232 and the second cavity 234 are fitted on the outside of the sleeve. The spark plug is detachably connected to the sleeve to facilitate maintenance and replacement of the spark plug after long-term use.

[0034] Furthermore, in this embodiment of the invention, the spark plug and the sleeve are connected by threads.

[0035] In the above structure, the first gas can be air and the second gas can be a combustion gas, or the first gas can be a combustion gas and the second gas can be air, and the combustion gas includes, but is not limited to, hydrogen and methane.

[0036] Preferably, the first gas is air, and the second gas is combustion gas. The air enters the combustion chamber 21 through the first channel and forms a gas film on the inner wall of the combustion chamber 21 to protect it, so as to adapt to the high temperature conditions inside the combustion chamber 21.

[0037] In the above structure, as one embodiment, the main body 22 of the present invention includes a first housing 221, a connecting plate 222, and a second housing 223. The first housing 221 is fixedly connected to the injection panel 231, the combustion chamber 21 is disposed inside the first housing 221, the connecting plate 222 is disposed at the rear end of the first housing 221 and is fixedly connected to the first housing 221, and the second housing 223 is fitted onto the outside of the first housing 221. A first cooling chamber 224 is formed between the first housing 221, the second housing 223, and the connecting plate 222. The air in the combustion chamber 21 and the combustion gas are combusted to produce high-temperature gas gas of about 1500 K to 2000 K, which requires efficient cooling of the inner wall of the combustion chamber 21. A cooling medium is introduced into the first cooling chamber 224 to cool the inner wall of the combustion chamber 21. Specifically, a first cooling inlet 225 and a first cooling outlet 226 are provided. The first cooling inlet 225 is located at the front end of the second housing 223 and is connected to the first cooling cavity 224. The first cooling inlet 225 is used to input cooling medium into the first cooling cavity 224. The first cooling outlet 226 is located at the rear end of the second housing 223 and is connected to the first cooling cavity 224. It is used to discharge cooling medium, so that there is flowing cooling medium in the first cooling cavity 224, resulting in better cooling effect.

[0038] Furthermore, the cooling medium can be any one of cooling air, liquid nitrogen, carbon dioxide refrigerant, or cooling water. Preferably, in the embodiments of the present invention, the cooling medium is specifically cooling water.

[0039] In the above structure, as a more preferred embodiment, the body part 22 in this embodiment of the invention further includes a first heat dissipation boss. The first heat dissipation boss is disposed on the outer surface of the first housing 221. The heat dissipation surface area is increased by the first heat dissipation boss, thereby improving the heat dissipation efficiency.

[0040] Furthermore, as one embodiment of the invention, the first heat dissipation boss extends radially along the first housing 221, and a plurality of first heat dissipation bosses are arranged circumferentially around the first housing 221.

[0041] In the above structure, as one embodiment, the outlet 25 of this invention includes an inner sleeve 251, an outer sleeve 252, and a second cooling chamber 253. The inner sleeve 251 is fixedly disposed at the rear end of the connecting plate 222, and the inner diameter of the inner sleeve 251 gradually decreases. The outer sleeve 252 is fitted onto the outside of the inner sleeve 251 and is fixedly connected to the connecting plate 222. The second cooling chamber 253 is formed between the connecting plate 222, the outer sleeve 252, and the inner sleeve 251. The outer sleeve 252 is provided with a first cooling inlet 225 and a second cooling outlet 255. The second cooling inlet 254 is used to input cooling medium into the second cooling chamber 253, and the second cooling outlet 255 is used to discharge the cooling medium from the second cooling chamber 253, so that the cooling medium flows in the second cooling chamber 253 and its cooling effect is better.

[0042] In one specific implementation, the second cooling inlet 254 of this embodiment is disposed at the top of the outer sleeve 252, and the second cooling outlet 255 is disposed at the bottom of the outer sleeve 252.

[0043] Furthermore, in order to further improve cooling efficiency, as one embodiment of the invention, the outlet portion 25 further includes a second heat dissipation boss. The second heat dissipation boss is disposed on the outside of the inner sleeve 251. By providing the second heat dissipation boss, the surface area of ​​the cooling medium is increased, resulting in a better cooling effect.

[0044] Furthermore, in this embodiment of the invention, the second heat dissipation protrusion is arranged circumferentially around the inner sleeve 251, and a plurality of second heat dissipation protrusions are arranged radially spaced along the inner sleeve 251.

[0045] Furthermore, as one embodiment, the main body 22 in this embodiment of the invention also includes a first pressure measuring point 227. The first pressure measuring point 227 is disposed on the connecting plate 222 and is connected to the combustion chamber 21 to detect the pressure of the combustion chamber 21. Based on the pressure in the combustion chamber, combined with the total flow rate of the gas, the total temperature in the combustion chamber can be estimated.

[0046] Furthermore, as one embodiment, the pre-combustion chamber 3 in this invention includes a pre-combustion chamber 31, a first temperature measuring point 32, and a second pressure measuring point 33. The inlet of the pre-combustion chamber 31 is connected to a third connector, and the inner diameter of the outlet section of the pre-combustion chamber 31 gradually decreases. The first temperature measuring point 32 and the second pressure measuring point 33 are provided on the pre-combustion chamber 31. The first temperature measuring point 32 is connected to the pre-combustion chamber 31, and the temperature of the pre-combustion chamber 31 is detected by the first temperature measuring point 32. The second pressure measuring point 33 is connected to the pre-combustion chamber 31, and the pressure inside the pre-combustion chamber 31 is detected by the second pressure measuring point 33, in order to infer the degree of pre-combustion of the powder and the injection pressure before entering the test section.

[0047] like Figures 5 to 10 As shown, the present invention also provides a heater assembly, including any of the solid powder pre-combustion assemblies mentioned above, a connecting pipe 4 and a heater 5, wherein the connecting pipe 4 is provided with a first inlet, a second inlet and a discharge port, the first inlet is connected to the outlet of the solid powder pre-combustion assembly, the discharge port is connected to the engine combustion chamber, the gas outlet of the heater 5 is connected to the second inlet, and the heater 5 is used to input high-temperature oxygen-enriched gas into the connecting pipe 4.

[0048] Powdered fuel with surface oxidizer removed is introduced through the first inlet, and high-temperature oxygen-enriched gas is introduced through the second inlet. The mixture is then subjected to secondary combustion in the engine combustion chamber. Since the oxide layer on the surface of the powder particles is effectively removed during the pre-combustion process, it will have good ignition performance during secondary combustion, thereby achieving self-ignition and start-up of the ramjet engine.

[0049] In the above structure, as one embodiment, the heater 5 in this invention includes a second gas generator 51 and an outlet connector. The outlet connector is connected to the rear end of the second gas generator 51, and its outlet is used to communicate with a second inlet. The second gas generator 51 is used to introduce high-temperature oxygen-enriched auxiliary gas into the engine combustion chamber. The outlet connector includes a nozzle 521, which gradually increases in diameter away from the second gas generator 51. Under combustion conditions, the inner diameter of the outlet section gradually decreases, forming a blockage at the point where the inner diameter of the outlet section is smallest, in order to reduce the impact of the downstream test section on the heater 5. At the same time, the throat diameter of the outlet section also determines the combustion chamber pressure. According to the isentropic flow assumption, after obtaining the mass flow rate and combustion chamber pressure data, the combustion chamber gas temperature can be estimated to a certain extent. Due to the flow coefficient, the data will have a certain deviation, but it is within an acceptable range. The nozzle 521 and the outlet section form a Laval nozzle, which accelerates the airflow to supersonic speed to meet the airflow velocity requirements of subsequent test sections, especially the scramjet engine test section.

[0050] In another embodiment of the invention, the gas outlet connector includes a gas sump 522, a third pressure measuring point 523, a second temperature measuring point 524, and a flow controller 525. The gas sump 522 receives the mixed gas output from the second gas generator 51. The third pressure measuring point 523 detects the gas pressure inside the gas sump 522, and the second temperature measuring point 524 detects the temperature inside the gas sump 522 to monitor the gas state. The flow controller 525 is located at the outlet of the gas sump 522 to regulate the flow rate of the output gas. The high-pressure gas generated by the second gas generator 51 enters the gas sump 522, reducing the flow velocity while the flow controller 525 controls the total pressure, thereby achieving a subsonic flow condition with controllable total pressure.

[0051] Furthermore, as one embodiment, the gas-holding chamber 522 in this invention is specifically a cylindrical internal cavity. More specifically, the inner diameter of the gas-holding chamber 522 is larger than the outlet inner diameter of the outlet section, in order to reduce the flow velocity.

[0052] It should be noted that the second gas generator in this embodiment of the invention has a structure that is basically the same as that of the first gas generator, and will not be described in detail here. The following only describes the differences in structure between the second gas generator and the first gas generator.

[0053] It should be emphasized that, compared with the high-temperature gas produced by the first gas generator, the first gas introduced into the combustion chamber of the second gas generator is specifically air and oxygen, and the second gas is specifically combustion gas.

[0054] In the above structure, as one embodiment, the heater in this embodiment of the invention further includes a flow divider 53 and a plug, wherein the flow divider 53 is connected to the combustion chamber of the second gas generator, the plug is fitted on the outside of the flow divider 53, and the plug and the flow divider 53 are detachably connected.

[0055] Furthermore, the diverter 53 is located on the connection plate of the second gas generator.

[0056] In the above structure, as one embodiment, the connecting pipe 4 in this invention embodiment further includes: a third inlet and a connecting pipe 54, wherein the third inlet is disposed on the connecting pipe, and the connecting pipe 54 is used to connect the third inlet and the diverter, and oxygen-rich high-temperature gas in the combustion chamber of the second gas generator is introduced into the combustion chamber of the engine through the connecting pipe, thereby realizing the staged combustion scheme of solid fuel powder in the test section.

[0057] During the staged combustion test phase, the third inlet is connected to the diversion connector on the second gas generator via a connecting pipe. Under non-test conditions, the diversion connector can be sealed with a plug.

[0058] The connection plate of the second gas generator is also equipped with pressure measuring points, through which the static pressure data of the combustion chamber of the second gas generator can be obtained.

[0059] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. A solid powder pre-combustion assembly, characterized in that, include: A fluid interconnect device (1) having a first interface, a second interface and a third interface, wherein the first interface is used to receive fluidized powdered fuel; The first gas generator (2) is used to receive auxiliary gas to generate high-temperature gas. The gas outlet of the gas generator (2) is connected to the second interface of the fluid interconnection device (1). The pre-combustion chamber (3) has its inlet connected to the third interface. The pre-combustion chamber (3) is used to receive high-temperature gas and powdered fuel and pre-combust them to remove the surface oxide layer of the powdered fuel.

2. The solid powder pre-combustion assembly according to claim 1, characterized in that, The first gas generator (2) includes: The main body (22) with built-in combustion chamber (21); An auxiliary gas supply assembly (23) is located at the front end of the main body (22) and communicates with the combustion chamber (21) for supplying auxiliary gas to the combustion chamber (21); An ignition device (24) is disposed in the combustion chamber (21); The outlet section (25) is connected to the rear end of the main body section (22), and an outlet channel is provided inside the outlet section (25), the inner diameter of the outlet channel gradually narrows.

3. The solid powder pre-combustion assembly according to claim 2, characterized in that, The gas supply component (23) includes: The injection panel (231) is fixedly connected to the front end of the main body (22), and the injection panel (231) is provided with mounting holes; A first cavity (232) is fixedly disposed at the front end of the injection panel (231). A first chamber is formed between the first cavity (232) and the injection panel (231). A first channel is formed between the first cavity and the inner wall of the mounting hole. The first channel is used to connect the first cavity and the combustion chamber (21). A first air inlet connector (233) communicating with the first chamber is provided on the first cavity (232). The second cavity (234) is fixedly disposed at the front end of the first cavity (232). The second cavity (234) and the first cavity (232) form a second chamber. The second chamber is connected to the combustion chamber (21). The second cavity (234) is provided with a second air intake connector (235) that is connected to the second chamber.

4. The solid powder pre-combustion assembly according to claim 3, characterized in that, The main body (22) includes: The first housing (221) is provided inside the combustion chamber (21); The connecting plate (222) is fixedly connected to the rear end of the first housing (221); The second housing (223) is fitted onto the outside of the first housing (221). The second housing (223) is fixedly connected to the connecting plate (222). A first cooling cavity (224) is formed between the second housing (223), the connecting plate (222), and the first housing (221). The first cooling inlet (225) is located at the front end of the second housing (223) and communicates with the first cooling cavity (224); The first cooling outlet (226) is located at the rear end of the second housing (223) and communicates with the first cooling cavity (224).

5. The solid powder pre-combustion assembly according to claim 4, characterized in that, The export section (25) includes: The inner sleeve (251) is fixedly disposed at the rear end of the connecting plate (222), and the inner diameter of the inner sleeve (251) gradually decreases; The outer sleeve (252) is fitted on the outside of the inner sleeve (251) and is fixedly connected to the connecting plate (222). A second cooling chamber (253) is formed between the connecting plate (222), the outer sleeve (252) and the inner sleeve (251). The outer sleeve (252) is provided with a second cooling inlet (254) and a second cooling outlet (255).

6. The solid powder pre-combustion assembly according to any one of claims 1 to 5, characterized in that, The pre-combustion chamber (3) includes: The pre-combustion chamber (31) has an inlet connected to the third connector, and the inner diameter of the outlet section of the pre-combustion chamber (31) gradually decreases. The first temperature measuring point (32) is connected to the pre-combustion chamber (31) and is used to detect the temperature inside the pre-combustion chamber; The second pressure measuring point (33) is connected to the pre-combustion chamber (31) and is used to detect the pressure of the pre-combustion chamber (31).

7. A heater assembly, characterized in that, Includes the solid powder pre-combustion assembly as described in any one of claims 1 to 6; A connecting pipe (4) is provided with a first inlet, a second inlet and a discharge port. The first inlet is connected to the outlet of the solid powder pre-combustion assembly, and the discharge port is used to communicate with the engine combustion chamber. The heater (5) has its outlet connected to the second inlet and is used to input oxygen-enriched gas into the connecting pipe (4).

8. The heater assembly according to claim 7, characterized in that, The heater (5) includes: Second gas generator (51); A gas outlet connector is connected to the rear end of the second gas generator (51), the outlet of which is used to communicate with the second inlet; in, The gas outlet connector includes: a nozzle (521) pointing away from the second gas generator (51), the inner diameter of the nozzle (521) gradually increasing; or, The air outlet connector includes: The gas-receiving chamber (522) is used to receive the mixed gas output from the second gas generator (51); The third pressure measuring point (523) is used to detect the air pressure inside the gas-holding chamber (522); The second temperature measuring point (524) is used to detect the temperature inside the gas-filled chamber (522); A flow controller (525) is provided at the outlet of the gas chamber (522) to regulate the output gas flow rate.

9. The heater assembly according to claim 8, characterized in that, The heater further includes: Diverter (53), which is connected to the combustion chamber of the second gas generator (51); A plug is fitted on the outside of the diverter (53), and the plug is detachably connected to the diverter (53).

10. The heater assembly according to claim 9, characterized in that, Also includes: The third inlet is located on the connecting pipe (4); A connecting pipe (54) is used to connect the third inlet to the diverter (53).

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