Cross-medium ramjet engine based on powder fuel

Abstract

The invention provides a powder fuel-based cross-medium ramjet engine which comprises a powder fuel cabin, a combustion chamber and a spray pipe are fixedly connected to the axial front end of the powder fuel cabin, a high-pressure gas tank is fixedly connected to the axial rear end of the powder fuel cabin, and a plurality of gas generators are fixedly arranged on the inner wall of the combustion chamber; a plurality of air inlet channels are arranged on the outer wall of the combustion chamber; the high-pressure gas tank is communicated with the powder fuel cabin through a high-pressure gas flow channel and a fluidization pipeline, and is communicated with the gas inlet channel through a gas inlet channel pressurizing pipeline; a liquid medium cavity is formed in the air inlet channel and communicates with the combustion chamber through a liquid medium main supply pipeline, an upstream liquid supply pipeline and a downstream liquid supply pipeline. Combustion energy release of the powder fuel in the air mode and the underwater mode of the cross-medium ramjet engine is effectively promoted, and the method is suitable for the powder fuel cross-medium ramjet engine.

Description

Technical Field

[0001] The invention belongs to the technical field of engine design, relates to a ramjet engine, and in particular to a cross-medium ramjet engine based on powder fuel. Background Art

[0002] The cross-medium ramjet engine can use oxygen in the atmosphere and water underwater as oxidants to achieve high-speed movement in the air and underwater respectively. It has the advantages of high specific impulse, long range, strong maneuverability, and good economy, and has been highly valued at home and abroad. At present, when working underwater, the cross-medium ramjet engine mostly uses a grain-type water ramjet power, which has certain limitations in thrust regulation and specific impulse performance.

[0003] Powdered fuel has high energy calorific value and specific impulse, and can quickly adjust the flow rate, thereby achieving engine thrust adjustment. Therefore, the cross-medium ramjet engine technology based on powdered fuel has gradually attracted the favor and attention of researchers at home and abroad. However, since the technology is still in its early stages, there is no mature solution that can be put into practical application. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a powder fuel-based cross-medium ramjet engine to solve the technical problems of the limitations of the prior art cross-medium ramjet engine in thrust regulation and specific impulse performance when working underwater.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0006] A cross-medium ramjet engine based on powder fuel includes a powder fuel tank, which is used to store powder fuel; the axial front end of the powder fuel tank is fixedly connected to a combustion chamber and a nozzle, and the combustion chamber and the nozzle are arranged in sequence from back to front; the axial rear end of the powder fuel tank is fixedly connected to a high-pressure gas tank, and the high-pressure gas tank is used to store high-pressure gas.

[0007] The powder fuel tank comprises a powder fuel tank shell; a powder fuel tank rear plate is integrated in the axial rear part of the powder fuel tank shell, a high-pressure gas flow channel is arranged at the center of the powder fuel tank rear plate, and the high-pressure gas flow channel extends rearward along the axial direction; a powder fuel tank front plate is integrated in the axial front part of the powder fuel tank shell, a powder fuel flow channel is arranged at the center of the powder fuel tank front plate, and the powder fuel flow channel extends forward along the axial direction; a powder fuel tank piston is movably arranged in the powder fuel tank shell, and the powder fuel tank piston is located in front of the powder fuel tank rear plate; the space between the axial rear end face of the powder fuel tank piston and the powder fuel tank rear plate is the piston driving chamber; the space surrounded by the axial front end face of the powder fuel tank piston, the powder fuel tank shell, the powder fuel tank front plate and the powder fuel tank piston is the powder fuel chamber.

[0008] The gas outlet end of the high-pressure gas tank is connected to the gas inlet end of the high-pressure gas flow channel, the first gas outlet end of the high-pressure gas flow channel is connected to the gas inlet end of the piston drive chamber, the gas in the piston drive chamber pushes the powder fuel tank piston to move forward, squeezes the powder fuel in the powder fuel chamber, and allows it to enter the combustion chamber through the powder fuel flow channel; the second gas outlet end of the high-pressure gas flow channel is connected to the gas inlet end of the fluidizing gas pipeline, and the gas outlet end of the fluidizing gas pipeline is connected to the powder fuel chamber.

[0009] A plurality of gas generators are fixedly arranged on the inner wall of the combustion chamber, and the plurality of gas generators are evenly arranged along the circumferential direction of the combustion chamber. A plurality of gas generator nozzles are arranged on the gas generators. The gas generator is used to generate high-temperature fuel gas, and the gas outlet end of the gas generator is connected to the gas inlet end of the gas generator nozzle, and the gas outlet end of the gas generator nozzle faces the powdered fuel entering the combustion chamber.

[0010] A plurality of air inlets are arranged on the outer wall of the combustion chamber; the air inlet end of the air inlet is used to introduce external gas medium, and the air outlet end of the air inlet is connected to the combustion chamber; a liquid medium cavity is arranged in the air inlet, and the liquid medium cavity is used to store liquid medium.

[0011] The liquid outlet end of the liquid medium cavity is connected to the liquid inlet end of the liquid medium main supply pipeline, the liquid outlet end of the liquid medium main supply pipeline is connected to the liquid inlet end of the upstream liquid supply pipeline and the liquid inlet end of the downstream liquid supply pipeline, the liquid outlet ends of the upstream liquid supply pipeline and the downstream liquid supply pipeline are both connected to the combustion chamber, and the liquid medium enters the combustion chamber through the liquid medium main supply pipeline, the upstream liquid supply pipeline and the downstream liquid supply pipeline; the third gas outlet end of the high-pressure gas flow channel is connected to the gas inlet ends of multiple intake duct boosting pipelines, and the gas outlet ends of the multiple intake duct boosting pipelines are connected to the liquid medium cavity.

[0012] The present invention also has the following technical features:

[0013] The high-pressure gas flow channel is provided with a high-pressure gas pressure reducing stop valve.

[0014] The powder fuel flow channel is provided with a powder fuel supply stop valve.

[0015] A powder flow regulating valve is arranged in the axial front end of the powder fuel cavity.

[0016] The fluidizing gas pipeline is provided with a fluidizing gas valve.

[0017] The intake duct boosting pipeline is provided with an intake duct boosting valve.

[0018] The liquid medium main supply pipeline is provided with a liquid medium supply stop valve.

[0019] The air intake duct includes an air intake duct outer shell, which is fixedly connected to the outer wall of the combustion chamber. The rear end of the air intake duct outer shell is integrally provided with an air intake duct convex body, and the gap between the air intake duct convex body and the inner wall of the air intake duct outer shell is the air intake duct inlet; the front end of the air intake duct outer shell is fixedly connected to the combustion chamber, and the opening at the front end of the air intake duct outer shell is the air intake duct outlet.

[0020] An inlet inlet baffle and an inlet throat baffle are arranged in the rear part of the inlet outer shell, the inlet throat baffle is located downstream of the inlet inlet baffle, one end of the inlet inlet baffle and the inlet throat baffle are fixed ends and are hinged to the inlet outer shell, and the other end of the inlet inlet baffle and the inlet throat baffle are movable ends; an inlet downstream baffle is arranged in the front part of the inlet outer shell, one end of the inlet downstream baffle is a fixed end and is hinged to the inlet outer shell, and the other end of the inlet downstream baffle is a movable end.

[0021] When the inlet baffle, the inlet throat baffle and the downstream baffle of the inlet are all folded and attached to the inner wall of the inlet outer shell, the inlet inlet and the inlet outlet are both open, and the gas medium enters the inlet from the inlet, and then enters the combustion chamber from the inlet outlet.

[0022] When the movable ends of the inlet baffle and the inlet throat baffle are in contact with the inlet convex body, and the downstream baffle of the inlet duct is flipped to be parallel to the central axis of the combustion chamber, the inlet inlet and the outlet of the inlet duct are closed, and the space enclosed by the inlet throat baffle, the downstream baffle of the inlet duct, the side wall of the inlet duct convex body and the inlet outer shell is a liquid medium cavity.

[0023] The intake duct outer shell includes an integrated first inner wall and a second inner wall of the intake duct, the first inner wall of the intake duct is parallel to the central axis of the combustion chamber, and the second inner wall of the intake duct is inclined; the intake duct inlet baffle and the intake duct throat baffle are folded and fitted on the first inner wall of the intake duct; the intake duct downstream baffle is folded and fitted on the second inner wall of the intake duct.

[0024] An air inlet support block is arranged between the air inlet and the powder fuel tank, and two sides of the air inlet support block are respectively fixedly connected to the powder fuel tank and the air inlet.

[0025] Compared with the prior art, the present invention has the following technical effects:

[0026] (I) The present invention provides a liquid medium cavity in the air inlet for liquid medium storage, and uses a high-pressure gas tank to pressurize the liquid medium cavity, thereby increasing the injection pressure of the water medium and the combustion chamber pressure, and ensuring that the cross-medium ramjet engine can achieve high thrust navigation; in addition, the gas generator of the present invention adopts a plurality of independent small module structures to provide conditions for multiple engine starts, and adopts a symmetrical structure arranged in the combustion chamber, which can enhance the mixed combustion characteristics of the fuel and improve the specific impulse performance of the engine. The present invention effectively promotes the combustion energy release of powder fuel in the air mode and underwater mode of the cross-medium ramjet engine, and is suitable for powder fuel cross-medium ramjet engines.

[0027] (II) The present invention provides valves on the pipeline and in the powder fuel tank, so that the ramjet engine can adjust the flow rate of powder fuel supply according to the ballistic requirements of the aircraft in the air and underwater, thereby enhancing the maneuverability and penetration capability of the aircraft.

[0028] (III) The present invention realizes the diversion type pressure supply of the high pressure gas tank by setting a plurality of air inlet boosting pipes, and at the same time, sets a plurality of main liquid medium supply pipes, and controls the valves on each pipe to open and close alternately, thereby realizing the alternating water supply and pressurization of a plurality of liquid medium chambers, and ensuring the stable and continuous navigation of the cross-medium ramjet engine in the underwater mode.

[0029] (IV) The shell of the gas generator of the present invention and the insulation inside the combustion chamber adopt an integrated design, which has a compact structure and improves the integration of the engine structure; the gas generators are staggered in the combustion chamber to promote the mixing and stable combustion of powdered fuel. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the overall structure of a powder fuel-based cross-medium ramjet engine in the air mode.

[0031] Figure 2 Schematic diagram of the overall structure of a powder fuel-based cross-medium ramjet engine in underwater mode.

[0032] Figure 3 This is a schematic diagram of the layout of the gas generator.

[0033] Figure 4 Schematic diagram of the air intake layout.

[0034] Figure 5 Schematic diagram of the layout of the gas generator nozzle.

[0035] The meanings of the numbers in the figure are: 1-powder fuel tank, 2-combustion chamber, 3-nozzle, 4-high-pressure gas tank, 5-fluidizing gas pipeline, 6-gas generator, 7-gas generator nozzle, 8-air inlet, 9-liquid medium main supply pipeline, 10-upstream liquid supply pipeline, 11-downstream liquid supply pipeline, 12-air inlet boost pipeline, 13-high-pressure gas pressure reducing stop valve, 14-powder fuel supply stop valve, 15-powder flow regulating valve, 16-fluidizing gas valve, 17-air inlet boost valve, 18-liquid medium supply stop valve, 19-air inlet support block.

[0036] 101-powder fuel tank shell, 102-powder fuel tank rear plate, 103-high-pressure gas flow channel, 104-powder fuel tank front plate, 105-powder fuel flow channel, 106-powder fuel tank piston, 107-piston drive chamber, 108-powder fuel chamber.

[0037] 801 - liquid medium cavity, 802 - air inlet outer shell, 803 - air inlet convex body, 804 - air inlet inlet, 805 - air inlet outlet, 806 - air inlet inlet baffle, 807 - air inlet throat baffle, 808 - air inlet downstream baffle.

[0038] 80201-the first inner wall of the air inlet duct, 80202-the second inner wall of the air inlet duct.

[0039] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0040] In the present invention, the meanings of "upstream" and "downstream" are: based on the flow direction of the medium, the position closer to the source of the medium is the upstream, and the position farther from the source of the medium relative to the upstream is the downstream.

[0041] It should be noted that, in the present invention, all parts and fuels, unless otherwise specified, are parts and fuels known in the art. For example, the high-pressure gas pressure reducing stop valve 13, the powder fuel supply stop valve 14, the powder flow regulating valve 15, the air intake boost valve 17 and the liquid medium supply stop valve 18 are all conventional valves known in the prior art. The powder fuel is powder fuel known in the prior art (such as aluminum-based powder fuel, magnesium-based powder fuel, polyborane compound powder fuel, etc.).

[0042] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0043] Example:

[0044] This embodiment provides a cross-medium ramjet engine based on powder fuel, such as Figure 1 and Figure 2 As shown, it includes a powder fuel tank 1, which is used to store powder fuel; the axial front end of the powder fuel tank 1 is fixedly connected to a combustion chamber 2 and a nozzle 3, and the combustion chamber 2 and the nozzle 3 are arranged in sequence from back to front; the axial rear end of the powder fuel tank 1 is fixedly connected to a high-pressure gas tank 4, which is used to store high-pressure gas.

[0045] like Figure 1 and Figure 2 As shown, the powder fuel tank 1 includes a powder fuel tank shell 101 fixedly connected to the high-pressure gas tank 4; a powder fuel tank rear plate 102 is integrated in the axial rear part of the powder fuel tank shell 101, and a high-pressure gas flow channel 103 is provided at the center of the powder fuel tank rear plate 102, and the high-pressure gas flow channel 103 extends backward along the axial direction; a powder fuel tank front plate 104 is integrated in the axial front part of the powder fuel tank shell 101, and a powder fuel flow channel 105 is provided at the center of the powder fuel tank front plate 104, and the powder fuel The flow channel 105 extends forward along the axial direction; a powder fuel tank piston 106 is movably arranged in the powder fuel tank shell 101, and the powder fuel tank piston 106 is located in front of the powder fuel tank rear plate 102; the space between the axial rear end face of the powder fuel tank piston 106 and the powder fuel tank rear plate 102 is the piston drive chamber 107; the space surrounded by the axial front end face of the powder fuel tank piston 106, the powder fuel tank shell 101, the powder fuel tank front plate 104 and the powder fuel tank piston 106 is the powder fuel chamber 108.

[0046] like Figure 1 and Figure 2 As shown, the gas outlet end of the high-pressure gas tank 4 is connected to the gas inlet end of the high-pressure gas flow channel 103, and the first gas outlet end of the high-pressure gas flow channel 103 is connected to the gas inlet end of the piston drive chamber 107. The gas in the piston drive chamber 107 pushes the powder fuel tank piston 106 to move forward, squeezing the powder fuel in the powder fuel chamber 108, so that it enters the combustion chamber 2 through the powder fuel flow channel 105; the second gas outlet end of the high-pressure gas flow channel 103 is connected to the gas inlet end of the fluidizing gas pipeline 5, and the gas outlet end of the fluidizing gas pipeline 5 is connected to the powder fuel chamber 108.

[0047] like Figure 1 , Figure 2and Figure 3 As shown, a plurality of gas generators 6 are fixedly arranged on the inner wall of the combustion chamber 2, and the plurality of gas generators 6 are evenly arranged along the circumferential direction of the combustion chamber 2, and a plurality of gas generator nozzles 7 are arranged on the gas generator 6; the gas generator 6 is used to generate high-temperature fuel gas, and the gas outlet end of the gas generator 6 is connected to the gas inlet end of the gas generator nozzle 7, and the gas outlet end of the gas generator nozzle 7 faces the powdered fuel entering the combustion chamber 2.

[0048] like Figure 1 and Figure 2 As shown, a plurality of air inlets 8 are arranged on the outer wall of the combustion chamber 2; the air inlet end of the air inlet 8 is used to introduce external gas medium, and the air outlet end of the air inlet 8 is connected to the combustion chamber 2; a liquid medium cavity 801 is arranged in the air inlet 8, and the liquid medium cavity 801 is used to store liquid medium; the liquid outlet end of the liquid medium cavity 801 is connected to the liquid inlet end of the liquid medium main supply pipeline 9, and the liquid outlet end of the liquid medium main supply pipeline 9 is connected to the liquid inlet end of the upstream liquid supply pipeline 10 and the liquid inlet end of the downstream liquid supply pipeline 11, and the liquid outlet ends of the upstream liquid supply pipeline 10 and the downstream liquid supply pipeline 11 are both connected to the combustion chamber 2, and the liquid medium enters the combustion chamber 2 through the liquid medium main supply pipeline 9, the upstream liquid supply pipeline 10 and the downstream liquid supply pipeline 11; the third air outlet end of the high-pressure gas flow channel 103 is connected to the air inlet end of the plurality of air inlet boosting pipelines 12, and the air outlet ends of the plurality of air inlet boosting pipelines 12 are connected to the liquid medium cavity 801.

[0049] In this embodiment, the gas flowing out of the high-pressure gas flow channel 103 is divided into three paths: the first path of gas enters the piston drive chamber 107, pushes the piston drive chamber 107 to move forward and squeezes the powder fuel in the powder fuel chamber 108, pushes the powder fuel to flow forward, and the powder fuel enters the combustion chamber 2 through the powder fuel flow channel 105. The second path of gas passes through the fluidizing gas valve 16, along the fluidizing gas pipeline 16 to reach the contraction section of the powder fuel tank, fluidizes the powder fuel, and prevents the powder fuel from being blocked when passing through the powder fuel supply stop valve 14 and the powder flow regulating valve 15. The third path of gas passes through the intake duct boost valve 17 along the intake duct boost pipeline 14 to enter the intake duct 8 (the number of intake duct boost pipelines 12 is the same as the number of multiple intake ducts 8 and corresponds one to one), to ensure that when the engine is working in a liquid environment, the liquid medium in the intake duct 8 is pressurized and supplied.

[0050] In this embodiment, the liquid medium main supply pipeline 9, the upstream liquid supply pipeline 10 and the downstream liquid supply pipeline 11 together constitute a liquid medium supply pipeline. After the liquid medium enters the liquid medium main supply pipeline 9 from the liquid medium cavity 801, it enters the upstream liquid supply pipeline 10 and the downstream liquid supply pipeline 11 respectively, and finally enters the combustion chamber 2 in two ways, thereby promoting efficient mixing and combustion of powdered fuel in the combustion chamber 2.

[0051] In this embodiment, multiple gas generators 6 are arranged in a staggered manner, which can promote the mixing and stable combustion of powdered fuel. Specifically, when the gas generator 6 is started, high-temperature gas is generated, and the high-temperature gas is sprayed into the combustion chamber 2 through the gas generator nozzle 7. After the high-temperature gas, the air introduced from the air inlet 8 and the powdered fuel are mixed and burned, the reaction thrust is generated through the acceleration effect of the nozzle 3, so that the cross-medium ramjet engine based on powdered fuel can sail at a high speed.

[0052] As a specific solution of this embodiment, Figure 1 and Figure 2 As shown, a high-pressure gas pressure reducing stop valve 13 is provided on the high-pressure gas flow channel 103. In this embodiment, the high-pressure gas pressure reducing stop valve 13 is used to reduce the pressure of the high-pressure gas in the high-pressure gas tank 4, so that the high-pressure gas is converted into a gas that meets the predetermined pressure requirement, and the decompressed gas flows out from the high-pressure gas flow channel 103 and is divided into three paths.

[0053] As a specific solution of this embodiment, Figure 1 and Figure 2 As shown, a powder fuel supply stop valve 14 is provided on the powder fuel flow channel 105. In this embodiment, by controlling the opening and closing of the powder fuel supply stop valve 14, continuous supply or stop of supply of powder fuel is achieved.

[0054] As a specific solution of this embodiment, Figure 1 and Figure 2 As shown, a powder flow regulating valve 15 is provided in the axial front end of the powder fuel cavity 108. In this embodiment, a stepper motor is used to control the powder flow regulating valve 15 to move forward and backward, thereby realizing the supply flow of the powder fuel. The supply flow of the powder fuel can be adjusted within a certain range according to the flight state, and the flow regulation ratio can reach 1:20.

[0055] As a specific solution of this embodiment, Figure 1 and Figure 2 As shown, a fluidizing gas valve 16 is provided on the fluidizing gas pipeline 5. In this embodiment, the gas flow in the fluidizing gas pipeline 5 is controlled by controlling the opening and closing of the fluidizing gas valve 16.

[0056] As a specific solution of this embodiment, Figure 1 and Figure 2 As shown, an intake duct boost valve 17 is provided on the intake duct boost pipe 12. In this embodiment, the gas flow in the intake duct boost pipe 12 is controlled by controlling the opening and closing of the intake duct boost valve 17.

[0057] As a specific solution of this embodiment, Figure 1 and Figure 2As shown, a plurality of liquid medium main supply pipelines 9 are respectively provided with liquid medium supply stop valves 18. In this embodiment, the continuous supply or stop supply of the liquid medium is achieved by controlling the opening and closing of the liquid medium supply stop valves 18; the liquid medium supply stop valves 18 on different pipelines are independently controlled, and the plurality of liquid medium supply stop valves 18 are alternately opened and closed to supply water, thereby ensuring that the engine works continuously and efficiently in the underwater mode.

[0058] As a specific solution of this embodiment, the powder fuel tank shell 101 is a hollow cylindrical structure; the main body of the powder fuel tank rear plate 102 is a circular plate structure, and a hollow cylindrical structure is arranged at the center of the circular plate structure, and the hollow cylindrical structure is a high-pressure gas flow channel 103.

[0059] As a specific solution of this embodiment, the main body of the powder fuel tank front plate 104 is a hollow conical structure, the diameter of the conical structure gradually decreases from back to front, and a hollow cylindrical structure is arranged at the center of the conical structure, and the hollow cylindrical structure is the powder fuel flow channel 105.

[0060] As a specific solution of this embodiment, the powder fuel chamber 108 is divided into a powder fuel tank body and a powder fuel tank contraction section from back to front, the powder fuel tank body is a hollow cylindrical structure, and the powder fuel tank contraction section is a hollow conical structure. In this embodiment, this design of the powder fuel chamber 108 is conducive to the flow and flow rate of the powder fuel.

[0061] As a specific solution of this embodiment, Figure 1 As shown, the air intake duct 8 includes an air intake duct outer shell 802, which is fixedly connected to the outer wall of the combustion chamber 2, and the rear end of the air intake duct outer shell 802 is integrally provided with an air intake duct protrusion 803, and the gap between the air intake duct protrusion 803 and the inner wall of the air intake duct outer shell 802 is the air intake duct inlet 804, and the air intake duct inlet 804 is the first air intake end of the air intake duct 8, and the shell of the air intake duct 8 is provided with an air intake duct boost pipe connecting port, which is the second air intake end of the air intake duct 8 and is connected to the air intake duct boost pipe 12; the front end of the air intake duct outer shell 802 is fixedly connected to the combustion chamber 2, and the opening at the front end of the air intake duct outer shell 802 is the air intake duct outlet 805, and the air intake duct outlet 805 is the air outlet end of the air intake duct 8.

[0062] like Figure 2As shown, an inlet duct inlet baffle 806 and an inlet duct throat baffle 807 are arranged in the rear part of the inlet duct outer shell 802, and the inlet duct throat baffle 807 is located downstream of the inlet duct inlet baffle 806, one end of the inlet duct inlet baffle 806 and the inlet duct throat baffle 807 are fixed ends and are hinged to the inlet duct outer shell 802, and the other ends of the inlet duct inlet baffle 806 and the inlet throat baffle 807 are movable ends; an inlet duct downstream baffle 808 is arranged in the front part of the inlet duct outer shell 802, one end of the inlet duct downstream baffle 808 is a fixed end and is hinged to the inlet duct outer shell 802, and the other end of the inlet duct downstream baffle 808 is a movable end.

[0063] like Figure 1 As shown, when the inlet baffle 806, the inlet throat baffle 807 and the inlet downstream baffle 808 are all folded and attached to the inner wall of the inlet outer shell 802, the inlet inlet 804 and the inlet outlet 805 are both open, and the gas medium enters the inlet 8 from the inlet inlet 804, and then enters the combustion chamber 2 from the inlet outlet 805.

[0064] like Figure 2 As shown, when the movable ends of the inlet baffle 806 and the inlet throat baffle 807 are in contact with the inlet convex body 803, and the downstream baffle 808 of the inlet duct is flipped to be parallel to the central axis of the combustion chamber 2, the inlet inlet 804 and the inlet outlet 805 are both closed, and the space enclosed by the inlet throat baffle 807, the downstream baffle 808, the side wall of the inlet duct convex body 803 and the inlet outer shell 802 is a liquid medium cavity 801.

[0065] In this embodiment, by providing an intake duct inlet baffle 806, an intake duct throat baffle 807 and an intake duct downstream baffle 808, the intake duct 8 can be switched from a gas flow state to a liquid storage state, thereby improving the integration of the engine.

[0066] As a specific solution of this embodiment, Figure 1 As shown, the air inlet duct outer shell 802 includes an integrally arranged first inner wall 80201 and a second inner wall 80202 of the air inlet duct, and the connection between the first inner wall 80201 and the second inner wall 80202 of the air inlet duct is smoothly transitioned; the first inner wall 80201 of the air inlet duct is parallel to the central axis of the combustion chamber 2, and the second inner wall 80202 of the air inlet duct is inclined; the air inlet duct inlet baffle 806 and the air inlet duct throat baffle 807 are folded and fitted on the first inner wall 80201 of the air inlet duct; the downstream baffle 808 of the air inlet duct is folded and fitted on the second inner wall 80202 of the air inlet duct.

[0067] As a specific solution of this embodiment, Figure 1 and Figure 2As shown, an air inlet support block 19 is provided between the air inlet convex body 803 and the powder fuel tank 1, and the two sides of the air inlet support block 19 are respectively fixedly connected to the outer surface of the powder fuel tank 1 and the air inlet convex body 803. In this embodiment, the air inlet support block 19 plays the role of supporting and fixing the air inlet 8.

[0068] As a specific solution of this embodiment, Figure 4 As shown, the number of air inlets 8 is 2 to 4. In this embodiment, the air inlet 8 can decelerate and pressurize a certain flow of gas medium before passing it into the combustion chamber 2, which can better meet the combustion requirements of the powder fuel. The position and number of the air inlet 8 can be manually adjusted and replaced according to the combustion characteristics of the powder fuel. For example: Figure 4 As shown in (A), there are four air inlets 8 and they are symmetrically arranged in pairs; Figure 4 As shown in (B), there are two air inlet passages 8 and they are arranged at 90 degrees.

[0069] As a specific solution of this embodiment, the number of main liquid medium supply pipes 9 is the same as the number of air inlet passages 8 and corresponds one to one, which is 2 to 4; the number of upstream liquid supply pipes 10 and downstream liquid supply pipes 11 can be 3 to 8 respectively. In this embodiment, the number and position of the upstream liquid supply pipes 10 and the downstream liquid supply pipes 11 can be adjusted according to the combustion characteristics of the powder fuel. The liquid outlet end of the upstream liquid supply pipe 10 is arranged on the wall of the combustion chamber 2 behind the air inlet passage 8, and the liquid outlet end of the downstream liquid supply pipe 11 is arranged on the wall of the combustion chamber 2 in front of the air inlet passage 8. The two can be adjusted in position in the axial direction and radial direction.

[0070] As a specific solution of this embodiment, an integrated gas generator device is arranged on the inner wall of the axial rear part, and the integrated gas generator device includes a gas generator integrated shell, and the gas generator integrated shell is integrally fixedly connected with the insulation layer on the inner wall of the combustion chamber 2; a plurality of gas generators 6 are fixedly arranged in the gas generator integrated shell. In this embodiment, the gas generator integrated shell is made of hard insulation material. Each gas generator 6 can be ignited individually according to flight requirements to realize multiple engine starts.

[0071] As a specific solution of this embodiment, Figure 5 As shown, the number of the gas generator nozzles 7 is 2 to 5. In this embodiment, the position and number of the gas generator nozzles 7 can be manually adjusted and replaced according to the combustion characteristics of the combustion chamber. Figure 5 As shown in (A), there are two gas generator nozzles 7 and they are symmetrically arranged; Figure 5 As shown in (B), there are four gas generator nozzles 7 and they are symmetrically arranged in pairs; Figure 5As shown in (C) in the figure, there are five gas generator nozzles 7, one of which is located at the center, and the other four gas generator nozzles 7 are located around and symmetrically arranged in pairs.

[0072] As a specific scheme of this embodiment, the powder fuel tank 1 and the combustion chamber 2 are circumferentially fixedly connected by screws, the powder fuel tank 1 and the high-pressure gas tank 4 are circumferentially fixedly connected by screws, the combustion chamber 2 and the nozzle 3 are fixedly connected by a threaded screw hole structure, and the air inlet 8 is fixed to the combustion chamber 2 by screw connection.

[0073] The working process of the powder fuel-based cross-medium ramjet engine of the present invention is as follows:

[0074] Step 1, using a powder fuel-based cross-medium ramjet engine in an air mode, with the gas medium being air; specifically, the following process is included:

[0075] When the powder fuel-based cross-medium ramjet engine is operating in an air mode, all the inlet baffles 806, the inlet throat baffles 807, and the inlet downstream baffles 808 are in an open state, and the air enters the combustion chamber 2 through the pressurization and deceleration effect of the inlet 8; at the same time, the high-pressure gas decompression stop valve 13 and the fluidizing gas valve 16 are opened, so that the high-pressure gas in the high-pressure gas tank 4 enters the piston drive chamber 107 and the contraction section of the powder fuel chamber, thereby squeezing the powder fuel tank piston 106 and fluidizing the powder fuel; then the powder fuel supply stop valve 14 is opened to promote the supply of powder fuel to the combustion chamber 2; at the same time, the gas generator 6 is ignited and burned to generate high-temperature combustion gas, which is sprayed into the combustion chamber 2 through the gas generator nozzle 7, promoting the rapid mixing and combustion of the powder fuel and air in the combustion chamber 2, releasing energy, and realizing high-speed flight of the engine.

[0076] Step 2, using the powder fuel-based cross-medium ramjet engine in an underwater mode, where the liquid medium is water (for the convenience of description, the number of the air inlet 8 is two as an example below); specifically comprising the following steps:

[0077] Step 2.1, when the powder fuel-based cross-medium ramjet engine operates in the underwater mode, the two air inlet inlet baffles 806 and the air inlet throat baffle 807 are both opened, and the two air inlet downstream baffles 808 are both closed. Under the action of the inertia of the engine moving from the air to the underwater, water quickly enters the two air inlets 8; when the water is full, the two air inlet inlet baffles 806 are closed to avoid the impact of water flow on the air inlet throat baffle 807, and the two air inlet throat baffles 807 are closed at the same time to form two liquid medium cavities 801.

[0078] Step 2.2, open one of the intake duct boost valves 17, so that a part of the high-pressure gas enters one of the liquid medium chambers 801 through one of the intake duct boost pipes 12 to pressurize the water, and then open one of the liquid medium supply stop valves 18 to ensure that the water is sprayed into the combustion chamber 2 at a certain pressure; when the water in the first liquid medium chamber 801 is about to be sprayed out, close the intake duct boost valve 17 and the liquid medium supply stop valve 18 on the pipe connected thereto, and at the same time open the intake duct inlet baffle 806 and the intake duct throat baffle 807 of the liquid medium chamber 801 to ensure that the water enters the liquid medium chamber 801 again.

[0079] Step 2.3, when the first liquid medium cavity 801 is filled with water, open another intake duct boost valve 17 to allow a portion of the high-pressure gas to enter another liquid medium cavity 801 through another intake duct boost pipe 12 to pressurize the water, and then open another liquid medium supply stop valve 18 to ensure that the water is sprayed into the combustion chamber 2 at a certain pressure; when the water in the second liquid medium cavity 801 is about to be sprayed out, close the intake duct boost valve 17 and the liquid medium supply stop valve 18 on the pipe connected thereto, and at the same time open the intake duct inlet baffle 806 and the intake duct throat baffle 807 of the liquid medium cavity 801 to ensure that water enters the liquid medium cavity 801 again.

[0080] Step 2.4, when the second liquid medium chamber 801 is filled with water, at this time, the first liquid medium chamber 801 is filled with water again, then the intake duct inlet baffle 806 and the intake duct throat baffle 807 of the first liquid medium chamber 801 are closed again, and then the first intake duct boost valve 17 is opened, so that a part of the high-pressure gas enters the first liquid medium chamber 801 through the first intake duct boost pipe 12 to pressurize the water, and then the first liquid medium chamber 801 is opened to ensure that the water is sprayed into the combustion chamber 2 at a certain pressure.

[0081] Step 2.5, when the water in steps 2 to 4 is sprayed into the combustion chamber 2 at a certain pressure, the high-pressure gas pressure reducing stop valve 13 and the fluidizing gas valve 16 are opened to allow the high-pressure gas in the high-pressure gas tank 4 to enter the piston drive chamber 107 and the contraction section of the powder fuel chamber, thereby squeezing the powder fuel tank piston 106 and fluidizing the powder fuel; then the powder fuel supply stop valve 14 is opened to promote the supply of powder fuel to the combustion chamber 2; at the same time, the gas generator 6 is ignited and burned to generate high-temperature combustion gas, which is sprayed into the combustion chamber 2 through the gas generator nozzle 7, promoting the powder fuel to be quickly mixed and burned with water in the combustion chamber 2 to release energy.

[0082] Step 2.6, performing a cycle according to the above steps 2.1 to 2.5 can ensure that the engine can continue to work efficiently when working underwater.

[0083] Step 3: Out of water process (switching from underwater mode to aerial mode):

[0084] Before the powder fuel-based cross-medium ramjet engine starts working in water, all the liquid medium cavities 801 are full of water. At the moment of water outlet, all the air inlet baffles 806, the air inlet throat baffles 807, and the air inlet downstream baffles 808 are in a closed state, and all the air inlet boost valves 17 and the liquid medium supply stop valves 18 are in an open state, ensuring that the water in the liquid medium cavity 801 is quickly sprayed into the combustion chamber 2, thereby generating a large thrust to help the engine quickly accelerate to the starting speed of the air mode, and then, all the air inlet baffles 806, the air inlet throat baffles 807, and the air inlet downstream baffles 808 are opened to ensure that air can normally enter the air inlet 8 and realize air mode flight; at the same time, all the air inlet boost valves 17 and the liquid medium supply stop valves 18 are closed.

Claims

1. A powder fuel-based cross-medium ramjet engine, comprising a powder fuel tank (1), the powder fuel tank (1) being used to store powder fuel; a combustion chamber (2) and a nozzle (3) are fixedly connected to the axial front end of the powder fuel tank (1), the combustion chamber (2) and the nozzle (3) being arranged in sequence from the back to the front; Features: The powder fuel tank (1) is fixedly connected to a high-pressure gas tank (4) at the axial rear end thereof, and the high-pressure gas tank (4) is used to store high-pressure gas; The powder fuel tank (1) comprises a powder fuel tank shell (101); a powder fuel tank rear plate (102) is integrally arranged in the axial rear part of the powder fuel tank shell (101); a high-pressure gas flow channel (103) is arranged at the center of the powder fuel tank rear plate (102); the high-pressure gas flow channel (103) extends backward along the axial direction; a powder fuel tank front plate (104) is integrally arranged in the axial front part of the powder fuel tank shell (101); a powder fuel flow channel (105) is arranged at the center of the powder fuel tank front plate (104); the powder fuel flow channel (105) extends along the axial direction. The powder fuel tank shell (101) extends forward; a powder fuel tank piston (106) is movably arranged in the powder fuel tank shell (101), and the powder fuel tank piston (106) is located in front of the powder fuel tank rear plate (102); the space between the axial rear end surface of the powder fuel tank piston (106) and the powder fuel tank rear plate (102) is a piston driving chamber (107); the space enclosed by the axial front end surface of the powder fuel tank piston (106), the powder fuel tank shell (101), the powder fuel tank front plate (104) and the powder fuel tank piston (106) is a powder fuel chamber (108); The gas outlet end of the high-pressure gas tank (4) is connected to the gas inlet end of the high-pressure gas flow channel (103), the first gas outlet end of the high-pressure gas flow channel (103) is connected to the gas inlet end of the piston drive chamber (107), the gas in the piston drive chamber (107) pushes the powder fuel tank piston (106) to move forward, squeezes the powder fuel in the powder fuel chamber (108), and allows the powder fuel to enter the combustion chamber (2) through the powder fuel flow channel (105); the second gas outlet end of the high-pressure gas flow channel (103) is connected to the gas inlet end of the fluidizing gas pipeline (5), and the gas outlet end of the fluidizing gas pipeline (5) is connected to the powder fuel chamber (108); A plurality of gas generators (6) are fixedly arranged on the inner wall of the combustion chamber (2), the plurality of gas generators (6) are evenly arranged along the circumferential direction of the combustion chamber (2), and a plurality of gas generator nozzles (7) are arranged on the gas generator (6); the gas generator (6) is used to generate high-temperature fuel gas, the gas outlet end of the gas generator (6) is connected to the gas inlet end of the gas generator nozzle (7), and the gas outlet end of the gas generator nozzle (7) faces the powder fuel entering the combustion chamber (2); A plurality of air inlet channels (8) are arranged on the outer wall of the combustion chamber (2); the air inlet end of the air inlet channel (8) is used to introduce external gaseous medium, and the air outlet end of the air inlet channel (8) is connected to the combustion chamber (2); a liquid medium cavity (801) is arranged in the air inlet channel (8), and the liquid medium cavity (801) is used to store liquid medium; The liquid outlet end of the liquid medium cavity (801) is connected to the liquid inlet end of the liquid medium main supply pipeline (9), and the liquid outlet end of the liquid medium main supply pipeline (9) is connected to the liquid inlet end of the upstream liquid supply pipeline (10) and the liquid inlet end of the downstream liquid supply pipeline (11). The liquid outlet ends of the upstream liquid supply pipeline (10) and the downstream liquid supply pipeline (11) are both connected to the combustion chamber (2), and the liquid medium enters the combustion chamber (2) through the liquid medium main supply pipeline (9), the upstream liquid supply pipeline (10) and the downstream liquid supply pipeline (11); the third gas outlet end of the high-pressure gas flow channel (103) is connected to the gas inlet end of the multiple gas inlet boosting pipelines (12), and the gas outlet ends of the multiple gas inlet boosting pipelines (12) are connected to the liquid medium cavity (801).

2. The powder fuel-based cross-media ramjet engine according to claim 1, characterized in that: The high-pressure gas flow channel (103) is provided with a high-pressure gas pressure reducing stop valve (13).

3. The powder fuel-based cross-media ramjet engine according to claim 1, characterized in that: The powder fuel flow channel (105) is provided with a powder fuel supply stop valve (14).

4. The powder fuel based trans-media ramjet engine according to claim 1, characterized in that: A powder flow regulating valve (15) is disposed in the axial front end of the powder fuel chamber (108).

5. The powder fuel based trans-media ramjet engine according to claim 1, characterized in that: The fluidizing gas pipeline (5) is provided with a fluidizing gas valve (16).

6. The powder fuel based transmedia ramjet engine of claim 1, characterized in that: The intake duct boosting pipeline (12) is provided with an intake duct boosting valve (17).

7. The powder fuel based trans-media ramjet engine of claim 1, characterized in that: The liquid medium main supply pipeline (9) is provided with a liquid medium supply stop valve (18).

8. The powder fuel based trans-media ramjet engine of claim 1, characterized in that: The air intake duct (8) comprises an air intake duct outer shell (802), the air intake duct outer shell (802) is fixedly connected to the outer wall of the combustion chamber (2), the rear end of the air intake duct outer shell (802) is integrally provided with an air intake duct protrusion (803), and the gap between the air intake duct protrusion (803) and the inner wall of the air intake duct outer shell (802) is the air intake duct inlet (804); the front end of the air intake duct outer shell (802) is fixedly connected to the combustion chamber (2), and the open part of the front end of the air intake duct outer shell (802) is the air intake duct outlet (805); An inlet duct inlet baffle (806) and an inlet duct throat baffle (807) are arranged in the rear part of the inlet duct outer shell (802), and the inlet duct throat baffle (807) is located downstream of the inlet duct inlet baffle (806), one end of the inlet duct inlet baffle (806) and the inlet duct throat baffle (807) is a fixed end and is hinged to the inlet duct outer shell (802), and the other end of the inlet duct inlet baffle (806) and the inlet duct throat baffle (807) is a movable end; an inlet duct downstream baffle (808) is arranged in the front part of the inlet duct outer shell (802), one end of the inlet duct downstream baffle (808) is a fixed end and is hinged to the inlet duct outer shell (802), and the other end of the inlet duct downstream baffle (808) is a movable end; When the air inlet baffle (806), the air inlet throat baffle (807) and the air inlet downstream baffle (808) are all folded and attached to the inner wall of the air inlet outer shell (802), the air inlet inlet (804) and the air inlet outlet (805) are both open, and the gas medium enters the air inlet (8) from the air inlet inlet (804) and then enters the combustion chamber (2) from the air inlet outlet (805); When the movable ends of the inlet baffle (806) and the inlet throat baffle (807) are in contact with the inlet convex body (803), and the downstream baffle (808) of the inlet is flipped to be parallel to the central axis of the combustion chamber (2), the inlet inlet (804) and the inlet outlet (805) are both closed, and the space enclosed by the inlet throat baffle (807), the downstream baffle (808), the side wall of the inlet convex body (803) and the inlet outer shell (802) is a liquid medium cavity (801).

9. The powder fuel based trans-media ramjet engine of claim 8, characterized in that: The air intake duct outer shell (802) comprises an integrally arranged first inner wall (80201) and a second inner wall (80202) of the air intake duct, wherein the first inner wall (80201) of the air intake duct is parallel to the central axis of the combustion chamber (2), and the second inner wall (80202) of the air intake duct is inclined; the air intake duct inlet baffle (806) and the air intake duct throat baffle (807) are folded and attached to the first inner wall (80201) of the air intake duct; and the air intake duct downstream baffle (808) is folded and attached to the second inner wall (80202) of the air intake duct.

10. The powder fuel based trans-media ramjet engine of claim 1, characterized in that: An air inlet support block (19) is provided between the air inlet (8) and the powder fuel tank (1), and two sides of the air inlet support block (19) are respectively fixedly connected to the powder fuel tank (1) and the air inlet (8).

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