A scramjet engine spanwise pulsed injection device

Abstract

The application provides a super-combustion ramjet engine spanwise pulse injection device, which comprises a spanwise injection cylinder and at least two pulse injection assemblies in parallel and communicated with the spanwise injection cylinder, the pulse injection assembly comprises a first valve body, a second valve body, a movable valve core arranged at an outlet end of the second valve body and a nozzle seat which are sequentially arranged along a fuel flow direction; at least two buffer cavities which are symmetrical along a second valve body axis are arranged at a connection position of a third valve seat and a second valve seat, a buffer elastic member is arranged in the buffer cavities, and a pressure relief pipeline which is communicated with the second cavities is arranged at one end of the buffer spring close to the buffer cavities. Advantageous effects: through the design of four buffer cavities, a pressure relief pipeline and a buffer elastic member, when the pressure in the pipeline changes, the buffer elastic member is compressed or rebounds, the water hammer effect is effectively reduced, the rate of fuel entering the second cavities from the pipeline is accelerated, the injection rate is further accelerated, the pulse lag phenomenon is reduced, and the pulse frequency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of pulse injection devices, specifically a kind of super-combustion ramjet spanwise pulse injection device, belong to engine oil atomizer technical field. BACKGROUND

[0002] In the current aviation industry, super-combustion ramjet as a kind of efficient, high-thrust power system, has been widely concerned, and the optimization of its combustion form and injection mode is of great significance to improve engine performance. In super-combustion ramjet, the combustion process is realized through the interaction of shock wave formation and supersonic combustion. In the combustion chamber, fuel and oxygen are mixed and ignited by high pressure shock wave, and the combustion speed is greatly improved through supersonic combustion technology, so that the combustion process is more complete, fast and efficient.

[0003] The characteristic of spanwise injection combustion is to inject fuel into the combustion chamber in a spanwise manner. Compared with traditional radial injection, it has more advantages. Spanwise injection can achieve more uniform fuel spray distribution, which is beneficial to improve combustion efficiency, and can also improve mixing effect, reduce local rich oil or gas phenomenon, and improve combustion stability. Especially when the Mach number is high, the gas flow speed is very fast, and the side wall effect is obvious. At this time, more fuel is needed near the side wall surface, so the spanwise injection mode is needed to reduce the injection amount in the middle and increase the injection amount on both side walls. The characteristic of pulse injection is to realize fuel delivery through intermittent injection. Compared with continuous injection, pulse injection can reduce pressure loss in the pipeline, improve the efficiency of the injection system, optimize the combustion process, improve combustion efficiency and performance high mixing effect, and improve the flame stabilization performance of the engine.

[0004] Therefore, the combination of super-combustion ramjet, spanwise injection combustion and pulse injection technology can realize more efficient and stable combustion process, and further improve the performance of the engine. SUMMARY

[0005] The present application provides a kind of super-combustion ramjet spanwise pulse injection device to solve the problems in the prior art. Four buffer cavities, pressure relief pipelines and buffer elastic elements are designed. When the valve core is opened or closed, water hammer effect will occur due to the change of pressure in the pipeline, and pulse lag phenomenon will also occur. When the pressure in the pipeline changes, the buffer elastic element is compressed or rebounds, effectively reducing the water hammer effect, and accelerating the rate of fuel entering the second cavity from the pipeline, thereby accelerating the injection rate and reducing the pulse lag phenomenon, and improving the pulse frequency.

[0006] Technical solution: a kind of super-combustion ramjet engine spanwise pulse injection device, including spanwise injection cylinder and at least two parallel with the pulse injection assembly of spanwise injection cylinder communication, the inside of the spanwise injection cylinder is provided with transverse pipeline, and at least two groups of injection pipeline, one end of the injection pipeline is communicated with transverse pipeline, the other end is communicated with combustion chamber, the transverse pipeline is connected the oil outlet of pulse injection assembly by injection pipeline, the both ends of the transverse pipeline are closed by bolt, the pulse injection assembly includes first valve body, second valve body, movable valve core arranged at the outlet end of second valve body and nozzle seat installed in fuel flow direction in sequence;

[0007] The first valve body is provided with a through first valve body through hole and a first cavity arranged at one end close to the second valve body, and the first cavity is provided with a reset elastic member, and the inner diameter of the first valve body through hole is smaller than the inner diameter of the first cavity;

[0008] The second valve body is provided with a through second valve body through hole, the valve core upper end is provided with hollow valve rod with oil injection hole at valve core connection end, the valve rod is slidably arranged in the second valve body through hole, and the valve rod upper end is connected with reset elastic member;

[0009] The nozzle seat is embeddedly installed in the injection cylinder, the nozzle seat is fixedly installed in the injection cylinder by first valve seat arranged outside the injection cylinder, the fuel inlet of the nozzle seat is matched with the valve core shape and is on the same axis with the valve core, and the fuel outlet pipe of the nozzle seat is communicated with injection pipeline;

[0010] The first valve seat is provided with second valve seat at upper end, and the middle part of the connection between the first valve seat and the second valve seat is provided with second cavity for accommodating valve core movement;

[0011] The third valve seat is embeddedly arranged at the upper end of the second valve seat, at least two buffer cavities symmetrical along the second valve body axis are arranged at the connection between the third valve seat and the second valve seat, buffer elastic members are arranged in the buffer cavities, the buffer elastic members include oil baffle ring and buffer spring arranged in the back cavity of the oil baffle ring, and the buffer cavity end close to the buffer spring is provided with pressure relief pipeline communicated with the second cavity.

[0012] The pulse injection assembly is installed on the spanwise injection cylinder as a pulse generator to realize spanwise pulse injection. In a scramjet engine, the high-speed and high-pressure incoming flow makes the fuel injection close to the side wall less, resulting in uneven fuel mixing, poor atomization effect, and difficulty in igniting or burning the fuel. The use of spanwise injection can improve the spray pattern, make the fuel more evenly distributed, and reasonably allocate the fuel injection ratio in the combustion chamber, which helps to avoid excessive fuel concentration in the central area of the combustion chamber, while increasing the fuel injection to the side wall to improve the combustion condition of the side wall area. Pulse injection combined with spanwise injection can achieve more flexible and precise combustion control, improve the dynamic response performance of the scramjet engine under different working conditions, and enable the scramjet engine to adapt to different load and speed requirements more quickly. The fuel combustion process is optimized, the precision control of pulse injection is combined, the fuel combustion efficiency is improved, and the engine performance is improved.

[0013] The buffer cavity is provided with a buffer elastic element, the spring section of the buffer elastic element is in abutment with the second valve body, the other end is an oil retaining ring, and the bottom of the buffer cavity is provided with a pressure relief pipeline. When the valve core is opened or closed, water hammer effect is generated in the pipeline due to the change of pressure, and pulse lag phenomenon is generated at the same time. When the valve core is abutted to the third valve body through hole port, the pressure in the pipeline increases, at this time, the pressure in the pipeline is greater than that in the second cavity, the buffer elastic element is compressed, and the pressure on the back of the oil retaining ring is discharged to the second cavity through the pressure relief pipeline. When the valve core moves downward, the pressure in the pipeline decreases due to the inflow of fuel into the second cavity, when the pressure in the pipeline is less than the elastic force of the buffer elastic element, the buffer elastic element rebounds outward, and the rate of fuel into the second cavity is accelerated. The buffer cavity can absorb and disperse the pressure wave generated by the water hammer effect, slow down the propagation speed of the pressure wave, and convert part of the energy into kinetic energy outside the pressure wave. The buffer cavity can also absorb the vibration energy generated by the water hammer effect, reduce the vibration and vibration amplitude of the pipeline, adjust the flow state of the fluid in the pipeline, and make the fluid flow more stable. The buffer cavity can maintain stable pressure in the pipeline, and can quickly respond to provide or absorb fuel pressure when pressure mutation occurs, thereby reducing the pulse lag time. Pulse lag can cause uneven and unstable fuel injection, affecting the efficiency and quality of the combustion process. By setting the buffer cavity, the pulse lag can be reduced, the precision and stability of fuel injection can be improved, the combustion process can be optimized, the combustion efficiency can be improved, and the working performance of the engine can be improved. By setting the buffer cavity and the buffer elastic element, the water hammer effect and pulse lag phenomenon generated by opening or closing the valve core can be reduced.

[0014] The upper end of the reset elastic member abuts against the upper end of the first cavity, and the lower end abuts against the upper end of the valve rod, the lower end of the valve core is embedded with the fuel inlet of the nozzle seat when the reset elastic member is not stressed, the outer side of the first valve body and the second valve body is provided with a sleeve, the outer side of the sleeve is wrapped with a conductive coil, the outer side of the conductive coil is sleeved with a coil sleeve, the conductive coil is connected with a power supply and the current is controlled by a switch.

[0015] The conductive coil is wrapped outside the sleeve, the coil sleeve is arranged outside the coil, the magnetic isolation seat is arranged between the second valve body and the coil sleeve, the first valve body, the second valve body, the valve core and the sleeve are made of magnetic conductive material, after the coil is electrified, the first valve body, the second valve body, the valve core and the sleeve are magnetized under the action of the magnetic field, the magnetic flux flows through the closed loop, the valve core moves along the axial direction under the action of the magnetic force and overcomes the elastic force of the reset elastic member. By periodically magnetizing the valve body and the valve core, the adsorption and release of the valve core can be controlled, so that the precise control of pulse injection can be realized, the failure rate of the injection system is reduced, the reliability and stability of the injection system are improved, the frequency of pulse injection is adjusted by controlling the on-off of the coil, and the response speed of pulse injection is improved.

[0016] The sleeve wrapped outside the first valve body and the second valve body is made of magnetic material, the sleeve separates the direct contact between the second valve body and the magnetic isolation seat, ensures the magnetization effect of the second valve body, improves the magnetization strength of the second valve body, so as to generate a stronger magnetic field, enhance the adsorption force of the adsorbed valve core, and make the valve core be adsorbed or released more quickly, thereby improving the response time of the injection device and the response speed of the pulse injection device.

[0017] The upper end of the reset elastic member is fixedly connected with the upper end of the first cavity, and the lower end is fixedly connected with the valve rod, the valve rod is fixedly connected with the lower end of the reset elastic member through the sealing plate, at least two pressure relief channels symmetrical to the second valve body through hole are arranged on the second valve body, the pressure relief channels communicate the buffer cavity and the first cavity, the height of the reset elastic member is 1 / 2 of the height of the first cavity, the upper end of the valve core is tightly fitted with the fuel outlet of the second valve body through hole under the pre-tightening force of the reset elastic member, the outer side of the first valve seat connected with one end of the nozzle seat is provided with a conductive coil, the outer side of the conductive coil is provided with a coil sleeve, the conductive coil is connected with a power supply and the current is controlled by a switch.

[0018] The upper end of the third valve seat is fixedly provided with a stepped magnetic isolation seat, the upper end of the magnetic isolation seat is fixedly connected with the coil sleeve, the inner side is fitted with the sleeve, and the lower end of the magnetic isolation seat separates the sleeve from the third valve seat, the oil blocking ring and the magnetic isolation seat are made of aluminum copper alloy material.

[0019] The magnetic isolation seat is arranged between the second valve body and the coil sleeve, and is used for isolating the magnetic field to prevent the buffer elastic member from being affected by the magnetic field. The magnetic isolation seat is made of a material that cannot be magnetized. When the coil is powered, the valve core is affected by the magnetic force to overcome the elastic force and abut against the end port of the third valve body. At this time, the fuel pipeline is closed. When the coil is powered off, the valve core is moved downward by the elastic force of the elastic member. At this time, the fuel pipeline is in communication, and the control device controls the valve core to reciprocate in this way.

[0020] The second valve seat is made of an aluminum-copper alloy material.

[0021] The second valve seat is a magnetic isolation component between the first valve seat and the third valve seat. Under the premise of providing sufficient rigidity, the second valve seat is not affected by the electromagnetic field, so that the buffer elastic member is not affected by the magnetic field.

[0022] The buffer cavity is arranged in a cross shape around the second valve body through hole, and the axes of the buffer cavities intersect on the axis of the second valve body through hole.

[0023] The second valve body through hole is provided with a third valve body through hole close to the valve core, the inner diameter of the third valve body through hole is smaller than the inner diameter of the second valve body through hole, the first fuel outlet pipeline and the second fuel outlet pipeline with different inner diameters are arranged in the second cavity to the fuel outlet of the nozzle seat, and the inner diameter of the first fuel outlet pipeline is greater than the inner diameter of the second fuel outlet pipeline.

[0024] The gradually reduced inner diameter gradually increases the pressure and flow rate of the fuel when passing through, and provides sufficient initial velocity for the final spanwise injection, so that the fuel atomization effect is better.

[0025] The connection between the second valve body through hole and the third valve body through hole is a trapezoidal smooth connection, the lower half of the second cavity is connected to the first fuel outlet pipeline in an arc shape, the connection between the first fuel outlet pipeline and the second fuel outlet pipeline is a trapezoidal smooth connection, and the port of the nozzle seat in contact with the valve core is provided with a chamfer with an angle of 45°.

[0026] The arc-shaped smooth connection provides a larger transition area, reduces pressure loss, improves the flow characteristics of the fluid, the arc-shaped structure makes the fluid flow more smoothly, reduces the flow resistance of the fluid, reduces the sudden change of the fluid in the flow process, reduces the formation of vortex and turbulent flow when the fluid moves, and makes the flow more stable. Due to the reduction of resistance and the generation of turbulent flow when the fluid passes through, the arc-shaped cavity design can reduce the pressure loss of the fluid flowing therein, which is beneficial to improve the flow speed of the fluid in the second cavity, reduce the pressure loss caused by the reduction of the pipe diameter, and improve the overall fluid motion efficiency. The sudden change of the pipe diameter will cause the pressure of the fluid to change suddenly, and the trapezoidal smooth connection can alleviate this pressure change. The trapezoidal smooth connection can gradually adjust the pipe diameter, so that the fluid flows more smoothly and continuously at the connection, reduces the resistance loss of the fluid inside the pipe, reduces the generation of vortex and turbulent flow inside the pipe, and is beneficial to the stable flow of the fluid, thereby improving the flow efficiency of the fluid in the pipe.

[0027] The injection pipeline is arranged in four and vertically arranged at the bottom of the transverse pipeline, the injection pipeline is vertically arranged and the bottom end is communicated with the transverse pipeline, the outlet port of the two injection pipelines in the cylinder body is taken as the starting and ending point, the four injection pipelines arranged in the transverse pipeline are respectively located at 1 / 5, 2 / 5, 3 / 5 and 4 / 5 of the full length, and the two groups of pulse injection assemblies are symmetrically distributed.

[0028] The four injection pipelines with equal distribution distance make the fuel uniformly distributed in the combustion chamber, improve the combustion characteristics, reduce the local concentration difference and unreasonable distribution of the fuel in the combustion chamber, and reduce the phenomenon of incomplete combustion. The four injection ports are distributed from the center of the combustion chamber to the two sides in the spanwise direction, so that the fuel is more reasonably distributed in the combustion chamber, improves the atomization effect and the level of oil-gas mixing, and reduces the interference of the side wall effect on the combustion process. The two pulse injection devices are symmetrically arranged at the two ends of the four injection pipelines, which can realize the injection sequence of first injecting the oil in the two end injection pipelines and then injecting the oil in the middle injection pipeline. The first injection of the two end injection pipelines can make the fuel first injected into the side wall area of the scramjet engine combustion chamber. Since the pressure of the middle flow in the scramjet engine combustion chamber is greater than that of the side wall area, the atomization effect and speed of the fuel in the middle area are higher than those in the side wall area. The first injection of the fuel into the side wall area of the scramjet engine combustion chamber can early atomize the fuel in the side wall area, increase the atomization time, improve the atomization effect, reduce the fuel concentration difference between the side wall area and the middle area of the scramjet engine combustion chamber, further reduce the influence of the side wall effect, further optimize the fuel distribution, and make the whole combustion process more efficient.

[0029] The injection pipeline section is an ellipse, the length of the long axis is 4mm, the long-short axis ratio is 4, and the four injection pipelines are arranged at different angles relative to the flow direction, and the windward direction is 90°, 45°, 135° and 90° from left to right on the inner wall of the scramjet engine.

[0030] The elliptical cross-section injection hole design can produce more uniform and stable spray patterns, and the distribution of the sprayed fuel particles is more uniform, forming a more delicate and uniform spray. Since the elliptical injection hole structure is more streamlined, the flow of fluid inside the injection hole is smoother and more continuous, reducing the collision loss between the fluid and the injection hole wall, thereby reducing the collision loss during fuel injection, which is beneficial to improve fuel utilization and energy conversion efficiency, and is beneficial to the full mixing of fuel and air, and improves the combustion efficiency. The design windward angle is 90°, 45°, 135° and 90°, so that the distribution of the sprayed fuel particles in the scramjet engine combustion chamber is more uniform, forming a more uniform injection cone, so that the fuel and air are more fully mixed, and the proportion of fuel distributed in the central and side wall regions of the combustion chamber can be reasonably distributed. Since the flow velocity and pressure in the central part of the combustion chamber are higher than those in the wall boundary part, the greater the contact area between the spray cross-section and the flow, the stronger the bending effect of the flow on the spray, thereby reducing the penetration depth. By setting different windward angles, the contact area between the spray cross-section and the flow in the low-pressure area of the wall boundary part in the combustion chamber is maximized, the contact area between the spray cross-section and the flow in the high-pressure area of the central part of the combustion chamber is reduced, the penetration depth of the injection hole jet is consistent, and the combustion efficiency is improved.

[0031] Beneficial effects: the present application combines pulse injection assembly and spanwise injection mode, places two groups of pulse injection assemblies on a spanwise injection cylinder to realize the combination of pulse injection and spanwise injection, improves the stability of pulse injection and the oil injection amount of pulse injection by designing two groups of pulse injection assemblies. The fuel passes through the gradually reduced pipeline to increase the flow rate and increase the fuel pressure, while reducing the influence of pipeline backflow, thereby improving the injection speed of the pulse injection device. The control device controls the periodic movement of the valve core along the axis, thereby controlling the periodic communication of the fuel pipeline. The control device controls the communication of the pulse injection device, thereby controlling the pulse frequency. By designing four buffer cavities, pressure relief pipelines and buffer elastic members, when the valve core is opened or closed, water hammer effect and pulse delay phenomenon will occur due to the change of pressure in the pipeline. When the pressure in the pipeline changes, the buffer elastic member is compressed or rebounds, effectively reducing the water hammer effect and accelerating the rate of fuel entering the second cavity from the pipeline, thereby accelerating the injection rate and reducing the pulse delay phenomenon, and improving the pulse frequency. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below only illustrate some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without creative effort based on these drawings are within the scope of the present application.

[0033] Figure 1 The overall structure diagram of the valve core downward embodiment in the power-off state of the present application.

[0034] Figure 2 The partial structure diagram of the valve core downward embodiment in the power-off state of the present application.

[0035] Figure 3 The pulse injection assembly structure diagram of the valve core upward embodiment in the power-off state of the present application.

[0036] Figure 4 The buffer cavity structure diagram of the valve core upward embodiment in the power-off state of the present application. DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of the present application.

[0038] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "above" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. "Below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] As Figure 1 And 4 The present application discloses a kind of hyperbolic ramjet engine spanwise pulse injection device, including spanwise injection cylinder 1 and at least two parallel with spanwise injection cylinder 1 communication pulse injection assembly, the inside of the spanwise injection cylinder 1 is provided with transverse pipeline 11, and at least two groups of injection pipeline 12, one end of the injection pipeline 12 is communicated with transverse pipeline 11, the other end is communicated with combustion chamber, the transverse pipeline 11 is connected with the oil outlet of pulse injection assembly by injection pipeline 13, the both ends of the transverse pipeline 11 are closed by bolt, the pulse injection assembly includes first valve body 2, second valve body 3, movable valve core 4 arranged at the outlet end of second valve body 3 and nozzle seat 5 installed in sequence along the fuel flow direction;

[0041] The first valve body 2 is provided with first valve body through hole 23 and first cavity 21 arranged at one end close to second valve body 3, the first cavity 21 is provided with reset elastic member 22, and the inner diameter of the first valve body through hole 23 is less than the inner diameter of the first cavity 21;

[0042] The second valve body 3 is provided with second valve body through hole 31, the valve core 4 is provided with hollow valve rod 41 with oil injection hole at the connection end of valve core 4 on the upper end, the valve rod 41 is slidably arranged in the second valve body through hole 31, and the upper end of the valve rod 41 is connected with reset elastic member 22;

[0043] The nozzle seat 5 is embeddedly installed in the injection cylinder 1, the nozzle seat 5 is fixedly installed in the injection cylinder 1 by first valve seat 6 arranged outside the injection cylinder 1, the fuel inlet of the nozzle seat 5 is matched with the shape of valve core 4 and is on the same axis line with valve core 4, and the fuel outlet pipe of the nozzle seat 5 is communicated with injection pipeline 13;

[0044] The first valve seat 6 is provided with second valve seat 7 at the upper end, and the middle part of the connection part of the first valve seat 6 and the second valve seat 7 is provided with second cavity 8 for accommodating the movement of valve core 4;

[0045] The upper end of the second valve seat 7 is embeddedly provided with third valve seat 9, at least two buffer cavities 10 symmetrical along the axis line of second valve body 3 are arranged at the connection part of the third valve seat 9 and the second valve seat 7, buffer elastic member 101 is arranged in the buffer cavity 10, the buffer elastic member 101 includes oil blocking ring 1011 and buffer spring 1012 arranged in the back cavity of the oil blocking ring 1011, and the end close to the buffer spring 1012 of the buffer cavity 10 is provided with pressure relief pipeline 1013 communicated with the second cavity 8.

[0046] The pulse injection assembly is installed on the spanwise injection cylinder 1 as a pulse generator to realize spanwise pulse injection, in a scramjet engine, high-speed and high-pressure incoming flow makes the space fuel injection close to the side wall less, leading to uneven fuel mixing in this area, poor atomization effect, and difficulty in igniting or burning fuel, using spanwise injection can improve the spray form, so that the fuel is more evenly distributed, and the fuel injection ratio in the combustion chamber is reasonably distributed, which helps to avoid excessive fuel concentration in the central area of the combustion chamber, while increasing the fuel injection to the side wall, improving the combustion condition of the side wall area, and pulse injection combined with spanwise injection can realize more flexible and accurate combustion control, improve the dynamic response performance of the scramjet engine under different working conditions, so that the scramjet engine can adapt to different load and speed requirements faster, optimize the fuel combustion process, and improve the fuel combustion efficiency and engine performance.

[0047] In order to further improve the pulse response speed of the spanwise pulse injection device, a buffer elastic member 101 is arranged in the buffer cavity 10, the spring section of the buffer elastic member 101 abuts against the second valve body 3, and the other end is an oil retaining ring 1011, and the bottom of the buffer cavity 10 is provided with a pressure relief pipeline 1013. When the valve core 4 is opened or closed, water hammer effect will be generated in the pipeline due to the change of pressure, and pulse lag phenomenon will also be generated. When the valve core 4 abuts against the third valve body through hole 32 port upward, the pressure in the pipeline increases, at this time, the pressure in the pipeline is greater than that in the second cavity 8, the buffer elastic member 101 is compressed, and the pressure on the back of the oil retaining ring 1011 is discharged to the second cavity 8 through the pressure relief pipeline 1013. When the valve core 4 moves downward, the pipeline pressure decreases due to the inflow of fuel into the second cavity 8, and when the pipeline pressure is less than the elastic force of the buffer elastic member 101, the buffer elastic member 101 rebounds outward, thereby accelerating the rate of fuel entering the second cavity 8. The buffer cavity 10 can absorb and disperse the pressure wave generated by the water hammer effect, so that the propagation speed of the pressure wave is slowed down, and part of the energy is converted into kinetic energy outside the pressure wave. In addition, the buffer cavity 10 can also absorb the vibration energy generated by the water hammer effect, reduce the vibration and vibration amplitude of the pipeline, adjust the flow state of the fluid in the pipeline, and make the fluid flow more stable. The buffer cavity 10 can maintain stable pressure in the pipeline, and when pressure mutation occurs, the buffer cavity 10 can quickly respond to provide or absorb fuel pressure, thereby reducing the pulse lag time. Pulse lag will cause uneven and unstable fuel injection, affecting the efficiency and quality of the combustion process. By arranging the buffer cavity 10, the pulse lag can be reduced, the precision and stability of fuel injection can be improved, the combustion process can be optimized, the combustion efficiency can be improved, and the working performance of the engine can be improved. By arranging the buffer cavity 10 and the buffer elastic member 101, the water hammer effect and pulse lag phenomenon generated by opening or closing of the valve core 4 can be reduced.

[0048] As Figure 1 and2 As shown, the upper end of the reset elastic element 22 abuts against the upper end of the first cavity 21, and the lower end abuts against the upper end of the valve stem 41. When the reset elastic element 22 is not under force, the lower end of the valve core 4 is engaged with the fuel inlet of the nozzle seat 5. A sleeve 14 is provided on the outside of the first valve body 2 and the second valve body 3. A conductive coil 15 is wrapped around the outside of the sleeve 14. A coil sleeve 16 is fitted around the outside of the conductive coil 15. The conductive coil 15 is connected to an external power source and the current is controlled by a switch.

[0049] A conductive coil 15 is wrapped around a sleeve 14. A coil sleeve 16 is located outside the coil. A magnetic shielding seat 17 is located between the second valve body 3 and the coil sleeve 16. The first valve body 2, the second valve body 3, the valve core 4, and the sleeve 14 are made of magnetically conductive material. When the coil is energized, the first valve body 2, the second valve body 3, the valve core 4, and the sleeve 14 are magnetized under the action of a magnetic field. Magnetic flux flows through to form a closed loop. Under the action of magnetic force, the valve core 4 overcomes the elastic force of the reset elastic element 22 and moves along the axial direction. By periodically magnetizing the valve body and the valve core 4, the adsorption and release of the valve core 4 can be controlled, thereby achieving precise control of pulse injection. By setting a simple, stable, and reliable pulse control device, the failure rate of the injection system is reduced, and the reliability and stability of the injection system are improved. By setting a control device to control the on and off of the coil, the frequency of pulse injection is adjusted, and the response speed of pulse injection is improved.

[0050] A sleeve 14, made of magnetic material, is provided to enclose the first valve body 2 and the second valve body 3. The sleeve 14 separates the second valve body 3 from the direct contact with the magnetic isolation seat 17, ensuring the magnetization effect of the second valve body 3 and increasing the magnetization intensity of the second valve body 3, thereby generating a stronger magnetic field. This enhances the adsorption force of the adsorption valve core 4, allowing the valve core 4 to be adsorbed or released more quickly, thus improving the response time of the injection device and the response speed of the pulse injection device.

[0051] like Figure 3 As shown, the upper end of the reset elastic element 22 is fixedly connected to the upper end of the first cavity 21, and the lower end is fixedly connected to the valve stem 41. The valve stem 41 is fixedly connected to the lower end of the reset elastic element 22 through a sealing plate. At least two pressure relief channels 33 are provided on the second valve body symmetrically along the through hole 31 of the second valve body. The pressure relief channels 33 connect the buffer cavity 10 and the first cavity 21. The height of the reset elastic element 22 is 1 / 2 of the height of the first cavity 21. The upper end of the valve core 4 is tightly fitted to the fuel outlet of the through hole 31 of the second valve body under the pre-tightening force of the reset elastic element 22. A conductive coil 15 is provided on the outer side of the end where the first valve seat 6 is connected to the nozzle seat 5. A coil sleeve 16 is provided on the outer side of the conductive coil 15. The conductive coil 15 is connected to an external power source and the current is controlled by a switch.

[0052] The upper end of the third valve seat 9 is fixedly provided with a stepped magnetic isolation seat 17, the upper end of the magnetic isolation seat 17 is fixedly connected with the coil sleeve 16, the inner side is attached with the sleeve 14, and the lower end of the magnetic isolation seat 17 separates the sleeve 14 from the third valve seat 9. The oil blocking ring 1011 and the magnetic isolation seat 17 are both made of aluminum-copper alloy material.

[0053] The magnetic isolation seat 17 is arranged between the second valve body 3 and the coil sleeve 16, is used for isolating the magnetic field to make the buffer elastic member 101 not affected by the magnetic field, is made of material that cannot be magnetized, when the coil is powered, the valve core 4 is affected by the magnetic force to overcome the elastic force to abut to the end port of the third valve body through hole 32, at this time, the fuel pipeline is closed, when the coil is powered off, the valve core 4 is moved downward by the elastic force of the elastic member, at this time, the fuel pipeline is communicated, and the control device controls the reciprocating movement of the valve core 4.

[0054] The second valve seat 7 is made of aluminum-copper alloy material.

[0055] The second valve seat 7 is a magnetic isolation component between the first valve seat 6 and the third valve seat 9, is not affected by the electromagnetic force under the premise of providing sufficient rigidity, and makes the buffer elastic member 101 not affected by the magnetic field.

[0056] The buffer cavity 10 is arranged in a cross shape along the second valve body through hole 31, and the axis of the buffer cavity 10 intersects with the axis of the second valve body through hole 31.

[0057] The third valve body through hole 32 is arranged close to the valve core 4, the inner diameter of the third valve body through hole 32 is smaller than that of the second valve body through hole 31, the first fuel outlet pipeline 51 and the second fuel outlet pipeline 52 with different inner diameters are arranged in the second cavity 8 to the fuel outlet of the nozzle seat 5, and the inner diameter of the first fuel outlet pipeline 51 is larger than that of the second fuel outlet pipeline 52.

[0058] The gradually reduced inner diameter makes the fuel gradually increase in pressure and speed when passing through, and can provide sufficient initial speed for the fuel when finally spreading to spray, so that the fuel atomization effect is better.

[0059] The connection between the second valve body through hole 31 and the third valve body through hole 32 is trapezoidal smooth connection, the lower half of the second cavity 8 is arc-shaped connection to the first fuel outlet pipeline 51, the connection between the first fuel outlet pipeline 51 and the second fuel outlet pipeline 52 is trapezoidal smooth connection, and the port of the nozzle seat 5 in contact with the valve core 4 is provided with a chamfer with an angle of 45°.

[0060] The arc-shaped smooth connection provides a larger transition area, reduces pressure loss, improves the flow characteristics of the fluid, the arc-shaped structure makes the fluid flow more smoothly, reduces the flow resistance of the fluid, reduces the sudden change of the fluid in the flow process, reduces the formation of vortex and turbulent flow when the fluid moves, and makes the flow more stable. Due to the reduction of resistance and the generation of turbulent flow when the fluid passes through, the arc-shaped cavity design can reduce the pressure loss of the fluid flowing therein, which is beneficial to improve the flow speed of the fluid in the second cavity 8, reduce the pressure loss caused by the reduction of the pipe diameter, and improve the overall fluid motion efficiency. The sudden change of the pipe diameter will cause the pressure of the fluid to change suddenly, and the trapezoidal smooth connection can alleviate this pressure change. The trapezoidal smooth connection can gradually adjust the pipe diameter, so that the fluid flows more smoothly and continuously at the connection, reduces the resistance loss of the fluid inside the pipe, reduces the generation of vortex and turbulent flow inside the pipe, and is beneficial to the stable flow of the fluid, thereby improving the flow efficiency of the fluid in the pipe.

[0061] The injection pipe 12 is arranged in four and vertically arranged at the bottom of the transverse pipe 11, the injection pipe 13 is vertically arranged and the bottom end is communicated with the transverse pipe 11, the two outlet ports of the injection pipe 13 in the cylinder body are taken as the starting and ending points, the four injection pipes 13 arranged in the transverse pipe 11 are respectively located at 1 / 5, 2 / 5, 3 / 5 and 4 / 5 of the full length, and the two groups of pulse injection assemblies are symmetrically distributed.

[0062] The four injection pipes 12 with equal distribution distance make the fuel uniformly distributed in the combustion chamber, improve the combustion characteristics, reduce the local concentration difference and unreasonable distribution of the fuel in the combustion chamber, and reduce the phenomenon of incomplete combustion. The four injection ports are distributed from the center of the combustion chamber to the two sides in the spanwise direction, so that the fuel is more reasonably distributed in the combustion chamber, improves the atomization effect and the level of oil-gas mixing, and reduces the interference of the side wall effect on the combustion process. The two pulse injection devices are symmetrically arranged at the two ends of the four injection pipes, which can realize the oil injection sequence of first injecting the oil in the two end injection pipes and then injecting the oil in the middle injection pipe. The first injection of the oil in the two end injection pipes can make the fuel first injected into the side wall area of the scramjet engine combustion chamber. Since the pressure of the middle flow in the scramjet engine combustion chamber is greater than that of the side wall area, the atomization effect and speed of the fuel in the middle area are higher than those in the side wall area. The first injection of the fuel into the side wall area of the scramjet engine combustion chamber can early atomize the fuel in the side wall area, increase the atomization time, improve the atomization effect, reduce the fuel concentration difference between the side wall area and the middle area of the scramjet engine combustion chamber, further reduce the influence of the side wall effect, further optimize the fuel distribution, and make the whole combustion process more efficient.

[0063] The injection pipeline 12 is in an elliptical shape, the length of the long axis is 4mm, the ratio of the long axis to the short axis is 4, the four injection pipelines 12 are arranged at different angles relative to the flow direction, and the windward angles are 90°, 45°, 135° and 90° from left to right on the inner wall of the scramjet engine.

[0064] The elliptical cross-section injection hole design can produce more uniform and stable spray patterns, and the distribution of the sprayed fuel particles is more uniform, forming a more delicate and uniform spray. Since the elliptical injection hole structure is more streamlined, the flow of fluid inside the injection hole is smoother and more continuous, reducing the collision loss between the fluid and the injection hole wall, thereby reducing the collision loss during fuel injection, which is conducive to improving fuel utilization and energy conversion efficiency, and conducive to the full mixing of fuel and air and improving combustion efficiency. The windward angles are designed to be 90°, 45°, 135° and 90° in sequence, so that the distribution of the sprayed fuel particles in the combustion chamber of the scramjet engine is more uniform, forming a more uniform spray cone, so that the fuel and air are more fully mixed, and the proportion of fuel distributed in the central and side wall regions of the combustion chamber can be reasonably distributed. Since the flow velocity and pressure in the central region of the combustion chamber are higher than those in the wall boundary part, the greater the contact area of the spray cross-section with the flow, the stronger the bending effect of the flow on the spray, thereby reducing the penetration depth. Setting different windward angles makes the contact area of the spray cross-section with the flow in the low-pressure area of the wall boundary part of the combustion chamber maximum, reduces the contact area of the spray cross-section with the flow in the high-pressure area of the central part of the combustion chamber, and makes the penetration depth of the injection hole jet consistent, thereby improving the combustion efficiency.

[0065] The working process and principle of the present application are as follows, taking the valve core downward when power is lost as an example:

[0066] The present application is connected to the oil pipeline, fuel enters the fuel inlet, passes through the first valve body through hole, enters the first cavity, then enters the second valve body through hole and the third valve body through hole, and the fuel passes through the hollow valve rod matched with the second valve body through hole and the third valve body through hole, the fuel flow rate is accelerated through the narrow pipeline, the fuel pressure is increased, and the influence of pipeline backflow is reduced, when the coil is powered on, the valve core is upwardly resisted to the third valve body through hole port by the magnetic force overcoming the elastic force, at this time, the pipeline is closed, the buffer cavity pressure is maximum, and the buffer elastic element is compressed, when the valve core is opened or closed, the pressure fluctuation change in the pipeline is generated, when the valve core is upwardly resisted to the third valve body through hole port, the pipeline pressure is increased, at this time, the pipeline pressure is greater than the second cavity, the buffer elastic element is compressed, and the back surface pressure of the oil baffle ring is discharged to the second cavity through the pressure relief pipeline, when the coil is powered off, the valve core is downwardly moved by the elastic force of the elastic element, at this time, the fuel pipeline is communicated, since the fuel flows into the second cavity, the pipeline pressure is reduced, when the pipeline pressure is less than the elastic force of the buffer elastic element, the buffer elastic element is rebounded outwardly, the fuel entering the second cavity is accelerated, the fuel flows out from the second cavity to the first fuel outlet pipeline, then passes through the second fuel outlet pipeline and enters the injection pipeline, and the fuel in the injection pipeline enters the transverse pipeline, then passes through four injection pipelines vertically communicated with the transverse pipeline and is injected into the combustion chamber of the scramjet engine.

[0067] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same or similar parts between the various embodiments can be referred to each other. For the device disclosed by the embodiments, since it corresponds to the method disclosed by the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0068] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A spanwise pulse injection device for a scramjet engine, comprising a spanwise injection cylinder (1) and at least two parallel pulse injection assemblies connected to the spanwise injection cylinder (1), wherein the spanwise injection cylinder (1) is provided with a transverse pipe (11) and at least two sets of injection pipes (12), one end of the injection pipe (12) is connected to the transverse pipe (11) and the other end is connected to the combustion chamber, the transverse pipe (11) is connected to the oil outlet of the pulse injection assembly through an injection pipe (13), and both ends of the transverse pipe (11) are sealed by bolts, characterized in that: The pulse injection assembly includes a first valve body (2), a second valve body (3), a movable valve core (4) disposed at the outlet end of the second valve body (3), and a nozzle seat (5) installed sequentially along the fuel flow direction. The first valve body (2) is provided with a through first valve body through hole (23) and a first cavity (21) provided near one end of the second valve body (3). The first cavity (21) is provided with a reset elastic element (22). The inner diameter of the first valve body through hole (23) is smaller than the inner diameter of the first cavity (21). The second valve body (3) is provided with a through second valve body through hole (31), and the upper end of the valve core (4) is provided with a hollow valve stem (41) with an oil injection hole at one end connected to the valve core (4). The valve stem (41) is slidably disposed in the second valve body through hole (31), and the upper end of the valve stem (41) is connected to the reset elastic element (22). The nozzle seat (5) is embedded in the injection cylinder body (1). The nozzle seat (5) is fixedly installed in the injection cylinder body (1) by a first valve seat (6) located on the outside of the injection cylinder body (1). The fuel inlet of the nozzle seat (5) matches the shape of the valve core (4) and is on the same axis as the valve core (4). The fuel outlet pipe of the nozzle seat (5) is connected to the injection pipeline (13). The first valve seat (6) is provided with a second valve seat (7) at its upper end. A second cavity (8) is provided at the middle of the connection between the first valve seat (6) and the second valve seat (7) to accommodate the movement of the valve core (4). A third valve seat (9) is embedded in the upper end of the second valve seat (7). At least two buffer cavities (10) symmetrical along the axis of the second valve body (3) are provided at the connection between the third valve seat (9) and the second valve seat (7). A buffer elastic element (101) is provided in the buffer cavity (10). The buffer elastic element (101) includes an oil baffle ring (1011) and a buffer spring (1012) provided in the back cavity of the oil baffle ring (1011). A pressure relief pipeline (1013) communicating with the second cavity (8) is provided at the end of the buffer cavity (10) near the buffer spring (1012).

2. The spanwise pulse injection device for a scramjet engine according to claim 1, characterized in that: The upper end of the reset elastic element (22) abuts against the upper end of the first cavity (21), and the lower end abuts against the upper end of the valve stem (41). When the reset elastic element (22) is not under force, the lower end of the valve core (4) is engaged with the fuel inlet of the nozzle seat (5). A sleeve (14) is provided on the outside of the first valve body (2) and the second valve body (3). A conductive coil (15) is wrapped on the outside of the sleeve (14). A coil sleeve (16) is fitted on the outside of the conductive coil (15). The conductive coil (15) is connected to an external power source and the current is controlled by a switch.

3. The spanwise pulse injection device for a scramjet engine according to claim 1, characterized in that: The upper end of the reset elastic element (22) is fixedly connected to the upper end of the first cavity (21), and the lower end is fixedly connected to the valve stem (41). The valve stem (41) is fixedly connected to the lower end of the reset elastic element (22) through a sealing plate. At least two pressure relief channels (33) are provided on the second valve body symmetrically along the second valve body through hole (31). The pressure relief channels (33) connect the buffer cavity (10) and the first cavity (21). The height of the reset elastic element (22) is 1 / 2 of the height of the first cavity (21). The upper end of the valve core (4) is tightly fitted to the fuel outlet of the second valve body through hole (31) under the pre-tightening force of the reset elastic element (22). The outer side of the first valve seat (6) connected to the nozzle seat (5) is wrapped with a conductive coil (15). A coil sleeve (16) is provided on the outer side of the conductive coil (15). The conductive coil (15) is connected to an external power source and the current is controlled by a switch.

4. The spanwise pulse injection device for a scramjet engine according to claim 2, characterized in that: The upper end of the third valve seat (9) is fixedly provided with a stepped magnetic shielding seat (17). The upper end of the magnetic shielding seat (17) is fixedly connected to the coil sleeve (16), and the inner side is in contact with the sleeve (14). The lower end of the magnetic shielding seat (17) separates the sleeve (14) from the third valve seat (9). The oil baffle ring (1011) and the magnetic shielding seat (17) are both made of aluminum-copper alloy material.

5. The spanwise pulse injection device for a scramjet engine according to claim 3, characterized in that: The second valve seat (7) is made of aluminum-copper alloy.

6. The spanwise pulse injection device for a scramjet engine according to claim 1, characterized in that: The buffer cavity (10) is arranged in a cross shape around the second valve body through hole (31), and the axis of the buffer cavity (10) intersects the axis of the second valve body through hole (31).

7. The spanwise pulse injection device for a scramjet engine according to claim 2 or 3, characterized in that: The second valve body through hole (31) is provided with a third valve body through hole (32) near the valve core (4). The inner diameter of the third valve body through hole (32) is smaller than the inner diameter of the second valve body through hole (31). The nozzle seat (5) is provided with a first fuel outlet pipe (51) and a second fuel outlet pipe (52) with different inner diameters from the second cavity (8) to the fuel outlet of the nozzle seat (5). The inner diameter of the first fuel outlet pipe (51) is larger than the inner diameter of the second fuel outlet pipe (52).

8. The spanwise pulse injection device for a scramjet engine according to claim 7, characterized in that: The connection between the second valve body through hole (31) and the third valve body through hole (32) is a trapezoidal smooth connection. The lower half of the second cavity (8) is arc-shaped and connected to the first fuel outlet pipe (51). The connection between the first fuel outlet pipe (51) and the second fuel outlet pipe (52) is a trapezoidal smooth connection. The port where the nozzle seat (5) contacts the valve core (4) is provided with a chamfer of 45°.

9. The spanwise pulse injection device for a scramjet engine according to claim 2 or 3, characterized in that: The injection pipes (12) are arranged in four vertical lines at the bottom of the transverse pipes (11). The injection pipes (13) are arranged vertically and their bottom ends are connected to the transverse pipes (11). The four injection pipes (13) arranged in the transverse pipes (11) are located at 1 / 5, 2 / 5, 3 / 5 and 4 / 5 of the total length, respectively, with the outlet ports of the two injection pipes (13) in the cylinder as the starting and ending points. The two sets of pulse injection components are symmetrically distributed.

10. The spanwise pulse injection device for a scramjet engine according to claim 9, characterized in that: The cross-section of the injection pipe (12) is elliptical, with a major axis length of 4mm and a major-to-minor axis ratio of 4. The four injection pipes (12) are set at different angles relative to the incoming flow direction. The windward direction from the left side to the right side of the inner wall of the scramjet engine is 90°, 45°, 135°, and 90° respectively.

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