Valved liquid fuel pulse engine

Abstract

The present disclosure provides a valve type liquid fuel pulse engine, which comprises a combustion chamber, a nozzle and an air valve; the air cycle into the combustion chamber is controlled by the air valve to generate pressure fluctuation, the air periodically enters the combustion chamber through the air valve, which promotes the periodic pulse combustion in the combustion chamber, the pressure in the combustion chamber generates periodic pulse, and the combustion gas is periodically ejected through the nozzle to generate periodic pulse thrust; the gas pressure fluctuation in the combustion chamber is controlled by the air valve, the strong mixing effect of fuel and air is realized, and high combustion efficiency can be easily achieved. The present disclosure scheme is reasonable, the overall structure is simple, there is no complex mechanical structure component, it has high reliability and stability, and can effectively save cost and improve engine performance.

Description

Technical Field

[0001] This disclosure relates to the field of air-breathing engines, and particularly to a valved liquid fuel pulse engine. Background Technology

[0002] Most current combustion devices employ steady-state combustion technology, while pulsed combustion, as a novel combustion technology, enhances fuel-air mixing by controlling gas pressure fluctuations within the combustion chamber, thereby improving combustion efficiency. Pulsed combustion begins with fuel and air mixing to form combustible gas, which is then ignited or otherwise brought into combustion, causing the produced gas to heat and pressurize. Controlled by an air valve, the combustion gas within the combustion chamber experiences pressure pulsations, forming pressure waves. These pressure waves reflect within the combustion chamber, creating reflected waves. The reflected waves and the original waves superimpose to form even stronger pressure waves. Under the influence of these pressure waves, fuel and air are efficiently mixed, improving combustion efficiency.

[0003] A pulsed combustion engine is a combustion device that generates power using pulsed combustion technology. Pulsed combustion engines achieve highly efficient energy conversion, resulting in higher combustion efficiency than traditional steady-state combustion devices. The pulsating gas pressure within the combustion chamber allows for more complete mixing and combustion, improving engine performance and reducing emissions. Pulsed combustion engines have a simple structure with no complex mechanical parts, thus offering higher reliability and stability. They can adapt to different fuels and operating conditions, allowing for a wider range of applications. Applications of pulsed combustion engines include aerospace, weaponry, shipbuilding, and automotive industries. The research and application of pulsed combustion engines are of great significance, as they can improve energy efficiency, reduce environmental pollution, and drive industrial technological development.

[0004] The current shortcomings of engines based on steady-state combustion technology mainly include the following aspects:

[0005] Low efficiency: The fuel and air mixing effect in steady-state combustion is poor, and high-efficiency energy conversion cannot be achieved.

[0006] High emissions: Fuel and air in steady-state combustion often cannot be fully burned, resulting in low combustion efficiency and high content of pollutants in combustion exhaust gas.

[0007] Low reliability: Steady-state combustion engines have complex structures and often contain complex mechanical actuators, resulting in poor reliability and stability.

[0008] Poor adaptability: In order to ensure high combustion efficiency, steady-state combustion engines need to adapt to different fuels and operating conditions, which limits their application range. Summary of the Invention

[0009] To address the aforementioned technical problems, the purpose of this disclosure is to provide a valved liquid fuel pulse engine. To achieve this objective, the present disclosure employs the following solution.

[0010] A valved liquid fuel pulse engine, the engine comprising: a combustion chamber, a nozzle, and an air valve;

[0011] The air valve controls the periodic pressure fluctuations in the combustion chamber. Air enters the combustion chamber periodically through the air valve, causing periodic combustion within the chamber. The pressure inside the combustion chamber pulsates periodically, and the fuel gas is periodically ejected through the nozzle, generating periodic pulsating thrust.

[0012] Optionally, the engine further includes an ignition device and a fuel supply assembly; the combustion chamber includes a front combustion chamber head, a cylindrical combustion chamber section, and a rear combustion chamber head.

[0013] The ignition interface is located at the front end of the combustion chamber, and the central axis of the ignition is arranged parallel to the central axis of the cylindrical section of the combustion chamber; the fuel supply component interface is located at the rear end of the combustion chamber, and the central axis of the fuel supply component interface is arranged parallel to the central axis of the cylindrical section of the combustion chamber; the nozzle interface is located at the rear end of the combustion chamber, and the central axis of the nozzle interface is arranged parallel to the central axis of the cylindrical section of the combustion chamber.

[0014] Optionally, the air valve is located at one end of the combustion chamber near the nozzle interface. The combustion chamber includes a rear end cap, and the air valve includes a front plate. The front plate is arranged parallel to the rear end cap end face of the combustion chamber.

[0015] Optionally, the air valve includes: a valve body, a front plate, a diaphragm, and a back plate; the front plate is fixed to the valve body, the back plate is fixed to the front plate, and the diaphragm can reciprocate between the gap between the front plate and the back plate.

[0016] Optionally, the air valve may also include: a retaining ring, a front panel air intake passage, a rear panel gas intake passage, and an elbow;

[0017] When the diaphragm presses against the back plate, the gas intake passage of the back plate is closed, and air enters the combustion chamber through the elbow via the gap between the front plate and the back plate; when the diaphragm presses against the front plate, the air intake passage of the front plate is closed, and air stops entering the combustion chamber; the gap between the front plate and the back plate is adjusted by a retaining ring to control the response speed of the diaphragm's reciprocating motion.

[0018] Optionally, when the combustion chamber pressure is lower than atmospheric pressure, atmospheric air pushes the diaphragm of the air valve through the front panel air intake passage, causing the back panel gas intake passage to close. Air then enters the combustion chamber through the gap between the front panel and the back panel via the elbow, where it mixes with fuel for combustion, causing the combustion chamber pressure to rise.

[0019] Optionally, when the combustion chamber pressure is higher than atmospheric pressure, the combustion chamber gas pushes the diaphragm of the air valve through the gas intake passage of the back plate, causing the front plate intake passage to close, stopping the air supply, and the combustion products are injected through the nozzle to generate thrust, thus reducing the combustion chamber pressure.

[0020] Optionally, the fuel supply assembly includes: a fuel supply pipe, a positioning ring, a fuel supply connector, a fuel supply branch pipe, and a fuel supply chamber; the positioning ring is used to adjust the position of the fuel supply branch pipe in the combustion chamber, and the central axis of the fuel supply chamber is arranged perpendicular to the central axis of the fuel supply branch pipe.

[0021] Optionally, the fuel supply assembly also includes a swirl plug and a nozzle body; the swirl plug and the nozzle body form a liquid fuel swirl channel, and the liquid fuel swirls through the swirl channel and is ejected from the nozzle body to form a conical liquid film to enhance the atomization effect.

[0022] Optionally, the central axis of the nozzle body coincides with the central axis of the oil supply chamber, and the central axis of the swirling plug coincides with the central axis of the nozzle body.

[0023] Compared with the prior art, this disclosure has the following technical effects:

[0024] 1. By controlling the gas pressure fluctuations in the combustion chamber through the air valve, a strong mixing effect between fuel and air can be achieved, making it easy to achieve high combustion efficiency.

[0025] 2. Through pulsed combustion technology, high combustion efficiency is achieved, and the pollutant content in the combustion exhaust gas is low.

[0026] 3. By creating a pulsating combustion field in the combustion chamber through the air valve, it has an adaptive enhanced mixing effect, which can adapt to different fuels and operating conditions, and has a wider range of applications.

[0027] 4. The engine design is reasonable, with a simple overall structure and no complex mechanical components, resulting in high reliability and stability, and effectively saving costs. Attached Figure Description

[0028] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0029] Figure 1 This is a schematic diagram of the structure of the pulse engine of the present invention;

[0030] Figure 2 This is a schematic diagram of the combustion chamber structure of the present invention;

[0031] Figure 3 This is a half-sectional view of the structure of the fuel supply assembly of the present invention;

[0032] Figure 4 This is a half-sectional view of the fuel supply branch pipe structure of the fuel supply component of the present invention;

[0033] Figure 5 This is a half-sectional view of the air valve structure of the present invention;

[0034] Figure 6 This is a side view of the air valve structure of the present invention;

[0035] Figure 7 This is a schematic diagram of the nozzle structure of the present invention;

[0036] Figure 8 This is a diagram of the periodic pulsating thrust generated by the periodic gas ejection of the present invention;

[0037] Wherein: 1-Ignition device, 2-Combustion chamber, 3-Fuel supply assembly, 4-Air valve, 5-Nozzle, 6-Front end cap of combustion chamber, 7-Ignition device interface, 8-Cylindrical section of combustion chamber, 9-Air valve interface, 10-Rear end cap of combustion chamber, 11-Fuel supply assembly interface, 12-Rear end cap face, 13-Nozzle interface, 14-Fuel supply pipe, 15-Positioning ring, 16-Fuel supply connector, 17-Fuel supply branch pipe, 18-Fuel supply chamber. 19-Swirl plug, 20-Nozzle body, 21-Valve body, 22-Front plate, 23-Diaphragm, 24-Back plate, 25-Back plate fixing screw, 26-Baffle ring, 27-Front plate air intake passage, 28-Back plate gas intake passage, 29-Elbow, 30-Front plate fixing screw, 31-First reinforcing ring, 32-Inlet cylindrical section, 33-Second reinforcing ring, 34-Expansion section, 35-Third reinforcing ring, 36-Outlet cylindrical section. Detailed Implementation

[0038] The following is in conjunction with the appendix Figures 1 to 8 The present disclosure will be further described in detail below with reference to the embodiments. It is to be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure. It should also be noted that, for ease of description, only the parts relevant to the present disclosure are shown in the accompanying drawings.

[0039] It should be noted that, where there is no conflict, the embodiments and features described in this disclosure can be combined with each other. The technical solutions of this disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0040] Unless otherwise stated, the exemplary implementations / embodiments shown are to be understood as providing exemplary features of various details that provide ways in which the technical concepts of this disclosure can be implemented in practice. Therefore, unless otherwise stated, the features of various implementations / embodiments may be additionally combined, separated, interchanged and / or rearranged without departing from the technical concepts of this disclosure.

[0041] The use of crosshairs and / or shading in the accompanying drawings is generally used to clarify the boundaries between adjacent components. Thus, unless otherwise stated, the presence or absence of crosshairs or shading does not convey or indicate any preference or requirement for the specific material, material properties, dimensions, proportions, commonalities between the illustrated components, or any other characteristics, properties, etc., of the components. Furthermore, in the accompanying drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.

[0042] When a component is referred to as being "on" or "above" another component, "connected to," or "joined to" another component, the component may be directly on, directly connected to, or directly joined to the other component, or there may be intermediate components. However, when a component is referred to as being "directly on" another component, "directly connected to," or "directly joined to" another component, there are no intermediate components. Therefore, the term "connection" can refer to a physical connection, an electrical connection, etc., and may or may not have intermediate components.

[0043] For descriptive purposes, this disclosure may use spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side (e.g., in a “sidewall”)” to describe the relationship between one component and another component as shown in the accompanying drawings. In addition to the orientations depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacture. For example, if the device in the drawings is flipped, a component described as “below” or “under” another component or feature would subsequently be positioned “above” said other component or feature. Thus, the exemplary term “below” can encompass both “above” and “below” orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or in other orientations), thus interpreting the spatial relative descriptive terms used herein accordingly.

[0044] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a” and “the” are intended to include the plural forms as well. Furthermore, when the terms “comprising” and / or “including” and variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, parts, components, and / or groups thereof, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, thus explaining the inherent biases in measurements, calculated values, and / or provided values ​​that would be recognized by one of ordinary skill in the art.

[0045] In one embodiment, this disclosure provides a valved liquid fuel pulsed engine, the engine comprising: a combustion chamber, a nozzle, and an air valve;

[0046] The air valve controls the periodic pressure fluctuations in the combustion chamber. Air enters the combustion chamber periodically through the air valve, causing periodic combustion within the chamber. The pressure inside the combustion chamber pulsates periodically, and the fuel gas is periodically ejected through the nozzle, generating periodic pulsating thrust.

[0047] In this embodiment, the pressure fluctuation of the gas in the combustion chamber is controlled by the air valve to achieve a strong mixing effect of fuel and air, which can easily achieve a high combustion efficiency.

[0048] In one embodiment, the engine further includes an ignition device and a fuel supply assembly; the combustion chamber includes a front combustion chamber head, a cylindrical combustion chamber section, and a rear combustion chamber head.

[0049] The ignition interface is located at the front end of the combustion chamber, and the central axis of the ignition is arranged parallel to the central axis of the cylindrical section of the combustion chamber; the fuel supply component interface is located at the rear end of the combustion chamber, and the central axis of the fuel supply component interface is arranged parallel to the central axis of the cylindrical section of the combustion chamber; the nozzle interface is located at the rear end of the combustion chamber, and the central axis of the nozzle interface is arranged parallel to the central axis of the cylindrical section of the combustion chamber.

[0050] In one embodiment, an air valve is disposed at one end of the combustion chamber near the nozzle inlet. The combustion chamber includes a rear end cap, and the air valve includes a front plate arranged parallel to the rear end cap face of the combustion chamber rear end cap.

[0051] In one embodiment, the air valve includes: a valve body, a front plate, a diaphragm, and a back plate; the front plate is fixed to the valve body, the back plate is fixed to the front plate, and the diaphragm can reciprocate between the gap between the front plate and the back plate.

[0052] In one embodiment, the air valve further includes: a retaining ring, a front panel air intake passage, a rear panel gas intake passage, and an elbow;

[0053] When the diaphragm presses against the back plate, the gas intake passage of the back plate is closed, and air enters the combustion chamber through the elbow via the gap between the front plate and the back plate; when the diaphragm presses against the front plate, the air intake passage of the front plate is closed, and air stops entering the combustion chamber; the gap between the front plate and the back plate is adjusted by a retaining ring to control the response speed of the diaphragm's reciprocating motion.

[0054] In one embodiment, when the combustion chamber pressure is lower than atmospheric pressure, atmospheric air pushes the diaphragm of the air valve through the front panel air intake passage, causing the back panel gas intake passage to close. Air then enters the combustion chamber through the gap between the front and back panels via the elbow, where it mixes with fuel for combustion, causing the combustion chamber pressure to rise.

[0055] In one embodiment, when the combustion chamber pressure is higher than atmospheric pressure, the combustion chamber gas pushes the diaphragm of the air valve through the gas intake passage of the back plate, causing the front plate intake passage to close, the air supply to stop, and the combustion products to be injected through the nozzle to generate thrust, thereby reducing the combustion chamber pressure.

[0056] In one embodiment, the fuel supply assembly includes: a fuel supply pipe, a positioning ring, a fuel supply connector, a fuel supply branch pipe, and a fuel supply chamber; the positioning ring is used to adjust the position of the fuel supply branch pipe in the combustion chamber, and the central axis of the fuel supply chamber is arranged perpendicular to the central axis of the fuel supply branch pipe.

[0057] In one embodiment, the fuel supply assembly further includes a swirl plug and a nozzle body; the swirl plug and the nozzle body form a liquid fuel swirl channel, and the liquid fuel swirls through the swirl channel and is ejected from the nozzle body to form a conical liquid film to enhance the atomization effect.

[0058] In one embodiment, the central axis of the nozzle body coincides with the central axis of the oil supply chamber, and the central axis of the swirling plug coincides with the central axis of the nozzle body.

[0059] like Figures 1 to 8 As shown, this disclosure provides a valved liquid fuel pulse engine, including an igniter 1, a combustion chamber 2, a fuel supply assembly 3, an air valve 4, and a nozzle 5;

[0060] Ignition device 1 is a standard solid ignition device, which is used to quickly start ignition by forming a mixture of incoming air from air valve 4 and incoming liquid fuel from fuel supply component 3; wherein, at least one air valve 4 is provided, which is provided on the side of combustion chamber 2 near nozzle interface 13, combustion chamber 2 includes combustion chamber rear end cap 10, and air valve 4 includes front plate 22, which is arranged parallel to the rear end cap end face 12 of combustion chamber rear end cap 10.

[0061] Reference Figure 2The combustion chamber 2 includes a front end cap 6, a cylindrical section 8, and a rear end cap 10. The front end cap 6, cylindrical section 8, and rear end cap 10 are thin-walled shell structures. An ignition interface 7 is located on the front end cap 6, and an ignition device 1 is connected to the ignition interface 7 via a threaded connection. The central axis of the ignition device 1 is parallel to the central axis of the cylindrical section 8. The front end cap 6 is welded to the cylindrical section 8, and the cylindrical section 8 is welded to the rear end cap 10. The cylindrical section 8 is provided with at least one air valve interface 9; preferably, two air valve interfaces 9 are provided. The air valve interface 9 has its cylindrical surface center axis distributed at 90 degrees in the combustion chamber cylindrical section 8. When there are more than two air valve interfaces 9, multiple air valve interfaces 9 are evenly distributed in the combustion chamber cylindrical section 8. The center axis of the air valve interface 9 is arranged perpendicular to the center axis of the combustion chamber cylindrical section 8 to reduce the tangential component of the air velocity entering the combustion chamber. The fuel supply assembly interface 11 is located in the combustion chamber rear end cap 10, and the center axis of the fuel supply assembly interface 11 is arranged parallel to the center axis of the combustion chamber cylindrical section 8. The nozzle interface 13 is located in the combustion chamber rear end cap 10, and the center axis of the nozzle interface 13 is arranged parallel to the center axis of the combustion chamber cylindrical section 8.

[0062] Reference Figures 3 to 4 The fuel supply assembly 3 includes a fuel supply pipe 14, a positioning ring 15, a fuel supply connector 16, fuel supply branch pipes 17, a fuel supply chamber 18, a swirl plug 19, and a nozzle body 20. The fuel supply assembly 3 is fixed to the rear end cap 10 of the combustion chamber via the positioning ring 15, which is also fixed to the fuel supply pipe 14. The position of the fuel supply branch pipe 17 in the combustion chamber 2 is adjusted by the positioning ring 15. The fuel supply connector 16 is fixed to the right end of the fuel supply pipe 14 and is used to connect to an external fuel supply line. The number of fuel supply branch pipes 17 is the same as the number of air valves 4. The included angle of the central axes of the multiple fuel supply branch pipes 17 is the same as the included angle of the central axis of the air valve interface 9. The multiple fuel supply branch pipes 17 are fixed to the fuel supply pipe 14. The fuel supply chamber 18 is fixed to the fuel supply branch pipes 17. The central axis is perpendicular to the central axis of the fuel supply branch pipe 17, and the central axis of the fuel supply chamber 18 coincides with the central axis of the elbow 29 of the air valve 4, which is used to increase the impact intensity of liquid fuel and air and improve the mixing effect; the nozzle body 20 is fixed inside the fuel supply chamber 18, and the central axis of the nozzle body 20 coincides with the central axis of the fuel supply chamber 18, which is used to reduce the loss of the axial velocity component of the liquid fuel; the swirling plug 19 is fixed inside the nozzle body 20, and the central axis of the swirling plug 19 coincides with the central axis of the nozzle body 20; the swirling plug 19 and the nozzle body 20 form a liquid fuel swirling channel, which is used to increase the rotation speed of the liquid fuel; the liquid fuel swirls through the swirling channel and is sprayed out from the nozzle body 20 to form a conical liquid film to improve the atomization effect.

[0063] Reference Figures 5 to 6The air valve 4 includes a valve body 21, a front plate 22, a diaphragm 23, a back plate 24, a back plate fixing screw 25, a retaining ring 26, a front plate air intake channel 27, a back plate gas intake channel 28, an elbow 29, and a front plate fixing screw 30. The elbow 29 of the air valve 4 is connected to the air valve interface 9 by welding. The front plate 22 is fixed to the valve body 21 by the front plate fixing screw 30. The back plate 24 is fixed to the front plate 22 by the back plate fixing screw 25. The diaphragm 23 can reciprocate between the gap between the front plate 22 and the back plate 24. When the diaphragm 23 presses against the back plate 24, When the back panel gas intake passage 28 is closed, air enters the combustion chamber 2 through the gap between the front panel 22 and the back panel 24 via the elbow 29. When the diaphragm 23 presses against the front panel 22, the front panel air intake passage 27 is closed, and air supply stops. The gap between the front panel 22 and the back panel 24 is adjusted by the retaining ring 26 to control the response speed of the reciprocating motion of the diaphragm 23. The number of air valves 4 is the same as the number of air valve interfaces 9. The elbows 29 of multiple air valves 4 are connected to the air valve interfaces 9 by welding, and the central axis of the elbow 29 coincides with the central axis of the air valve interface 9.

[0064] Reference Figure 7 The nozzle 5 includes a first reinforcing ring 31, an inlet cylindrical section 32, a second reinforcing ring 33, an expansion section 34, a third reinforcing ring 35, and an outlet cylindrical section 36. The inlet cylindrical section 32 of the nozzle 5 is welded to the nozzle interface 13. Since the gas temperature is extremely high at this point, the first reinforcing ring 31 is used for reinforcement. The inner diameter of the first reinforcing ring 31 is the same as the outer diameter of the nozzle interface 13, the wall thickness is not less than 3mm, and the length is not less than half the inner diameter of the first reinforcing ring 31. The expansion section 34 of the nozzle 5 is welded to the inlet cylindrical section 32. The gas temperature at this point is lower than at the first reinforcing ring 31. A second reinforcing ring 33 is used for reinforcement. The inner diameter of the second reinforcing ring 33 is the same as the outer diameter of the inlet cylindrical section 32, the wall thickness is not less than 2 mm, and the length is not less than one-third of the inner diameter of the second reinforcing ring 33. The outlet cylindrical section 36 of the nozzle 5 is connected to the expansion section 34 by welding. The gas temperature at this point is lower than that at the second reinforcing ring 33. A third reinforcing ring 35 is used for reinforcement. The inner diameter of the third reinforcing ring 35 is the same as the outer diameter of the outlet cylindrical section 36, the wall thickness is not less than 1 mm, and the length is not less than one-third of the inner diameter of the third reinforcing ring 35. The combustion products are expanded and accelerated through the expansion section 34 and discharged from the outlet cylindrical section 36, generating thrust.

[0065] The engine operates as follows:

[0066] Step 1: When a valved liquid fuel pulse engine is in operation, the igniter 1 receives a signal and starts ignition, and then the fuel supply assembly 3 starts supplying fuel.

[0067] Step 2: Liquid fuel enters the fuel supply chamber 18 through the fuel supply pipe 14 and the fuel supply branch pipe 17. The fuel is sprayed out from the nozzle body 20 outlet through the swirling channel formed by the swirling plug 19 and the nozzle body 20 to form a conical liquid film and enter the combustion chamber 2.

[0068] Step 3: Air enters the combustion chamber 2 through the air valve 4. The liquid fuel and the air in the combustion chamber 2 mix to form a mixture. The mixture is ignited by the igniter 1 and begins to burn. The pressure in the combustion chamber 2 begins to rise.

[0069] Step 4: When the pressure in the combustion chamber 2 rises above atmospheric pressure, the gas in the combustion chamber 2 pushes the diaphragm 23 of the air valve 4 to move through the gas intake passage 28 on the back plate. The diaphragm 23 of the air valve 4 presses against the front plate 22, the air intake passage 27 on the front plate is closed, the air supply stops, the combustion products are injected through the nozzle 5 to generate thrust, and the pressure in the combustion chamber 2 begins to drop.

[0070] Step 5: When the pressure in the combustion chamber 2 drops below atmospheric pressure, atmospheric air pushes the diaphragm 23 of the air valve 4 through the front air intake passage 27. The diaphragm 23 of the air valve 4 presses against the back plate 24, and the back plate gas intake passage 28 is closed. Air enters the combustion chamber 2 through the gap between the front plate 22 and the back plate 24 and through the elbow 29. The air mixes with the fuel and burns, and the pressure in the combustion chamber 2 rises.

[0071] Repeating steps 2-5 as described above, air periodically enters combustion chamber 2 through air valve 4, causing periodic combustion within combustion chamber 2. This results in periodic pressure pulsations within combustion chamber 2, and the periodic ejection of combustion gas through nozzle 5 generates periodic pulsating thrust. The generated periodic pulsating thrust is as follows: Figure 8 As shown.

[0072] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0073] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0074] Those skilled in the art should understand that the above embodiments are merely for illustrating the present disclosure and are not intended to limit the scope of the disclosure. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present disclosure.

Claims

1. A valved liquid fuel pulse engine, characterized in that, The engine includes: a combustion chamber, a nozzle, and an air valve; The air valve is located at one end of the combustion chamber near the nozzle interface. The combustion chamber includes a rear end cap, and the air valve includes a front plate. The front plate is arranged parallel to the rear end cap end face of the combustion chamber. The air valve also includes: a valve body, a front plate, a diaphragm, and a back plate; the front plate is fixed to the valve body, the back plate is fixed to the front plate, and the diaphragm can reciprocate between the gap between the front plate and the back plate; The air valve also includes: a retaining ring, a front plate air intake passage, a back plate gas intake passage, and an elbow; when the diaphragm presses against the back plate, the back plate gas intake passage is closed, and air enters the combustion chamber through the elbow via the gap between the front plate and the back plate; when the diaphragm presses against the front plate, the front plate air intake passage is closed, and air stops entering the combustion chamber; the gap between the front plate and the back plate is adjusted by the retaining ring to control the response speed of the diaphragm's reciprocating motion; The air valve controls the periodic pressure fluctuations in the combustion chamber. Air enters the combustion chamber periodically through the air valve, causing periodic combustion within the chamber. The pressure inside the combustion chamber pulsates periodically, and the fuel gas is periodically ejected through the nozzle, generating periodic pulsating thrust.

2. The valved liquid fuel pulse engine according to claim 1, characterized in that, The engine also includes an ignition device and a fuel supply assembly; the combustion chamber includes a front end cap, a cylindrical section of the combustion chamber, and a rear end cap. The ignition interface is located at the front end of the combustion chamber, and the central axis of the ignition is arranged parallel to the central axis of the cylindrical section of the combustion chamber; the fuel supply component interface is located at the rear end of the combustion chamber, and the central axis of the fuel supply component interface is arranged parallel to the central axis of the cylindrical section of the combustion chamber; the nozzle interface is located at the rear end of the combustion chamber, and the central axis of the nozzle interface is arranged parallel to the central axis of the cylindrical section of the combustion chamber.

3. The valved liquid fuel pulse engine according to claim 1 or 2, characterized in that, When the combustion chamber pressure is lower than atmospheric pressure, atmospheric air pushes the diaphragm of the air valve through the front panel air intake passage, causing the back panel gas intake passage to close. Air then enters the combustion chamber through the gap between the front and back panels via the elbow, where it mixes with the fuel and burns, causing the combustion chamber pressure to rise.

4. The valved liquid fuel pulse engine according to claim 3, characterized in that, When the combustion chamber pressure is higher than atmospheric pressure, the combustion chamber gas pushes the diaphragm of the air valve through the gas intake passage of the back plate, causing the front plate intake passage to close, stopping the air supply, and the combustion products are injected through the nozzle to generate thrust, thus reducing the combustion chamber pressure.

5. The valved liquid fuel pulse engine according to claim 2, characterized in that, The fuel supply components include: fuel supply pipe, positioning ring, fuel supply connector, fuel supply branch pipe, and fuel supply chamber; The positioning ring is used to adjust the position of the fuel supply branch pipe in the combustion chamber, and the central axis of the fuel supply chamber is arranged perpendicular to the central axis of the fuel supply branch pipe.

6. The valved liquid fuel pulse engine according to claim 5, characterized in that, The fuel supply assembly also includes: a swirl plug and a nozzle body; The swirling plug and the nozzle body form a liquid fuel swirling channel. The liquid fuel swirls through the swirling channel and is ejected from the nozzle body to form a conical liquid film to enhance the atomization effect.

7. The valved liquid fuel pulse engine according to claim 6, characterized in that, The central axis of the nozzle body coincides with the central axis of the oil supply chamber, and the central axis of the swirling plug coincides with the central axis of the nozzle body.

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