Control device and control method of ramjet pintle injector

Abstract

The invention belongs to the technical field of ramjet engines, and discloses a ramjet engine pintle injector control device and a control method thereof, and the control device comprises a pressure sensor, a pressure chamber and a control assembly. The pressure sensor is arranged at a fuel injection outlet of the pintle injector, and the outer wall of the pressure cavity is connected with a shell of the pintle injector. An elastic device is arranged in the pressure cavity and connected with the tail end of the pintle which penetrates through the pintle injector shell and then enters the pressure cavity. The control assembly controls the elasticity of the elastic device, so that the elastic device drives the pintle to move to adjust the fuel injection pressure. The control device is simple in structure, the control method is simple, convenient and effective, the processes of pressurization, injection, atomization, combustion and the like of the fuel oil in the combustion chamber can be controlled with small resource expenditure, and the stability and reliability of the control process are guaranteed. Meanwhile, a stable state can be achieved more quickly by adopting a fuzzy control algorithm, the dynamic process is more stable, and fluctuation is small.

Description

Technical Field

[0001] The invention belongs to the field of ramjet engines, and relates to a ramjet engine pintle injector control device and a control method thereof. Background Art

[0002] A ramjet is an air jet engine that relies on the deceleration and supercharging of high-speed oncoming air flow. It has a simple structure, and the air compression entering the engine is achieved by the stagnation of high-speed airflow (ramjet supercharging). Ramjet engines need to ensure that fuel and air are fully mixed under high-speed airflow to ensure stable flame combustion, especially scramjet engines need to burn under supersonic airflow, which is very difficult.

[0003] At present, pintle injectors are used for fuel injection. Pintle injectors allow the fuel to flow through the central flow channel and inject radially and axially through the gaps around the pintle to atomize the fuel. With the help of the opening control of the pintle injector, the need to control the degree of atomization of the fuel can be met. The injection and atomization of the fuel by the injector directly affects the subsequent vaporization of the fuel, the mixing with oxygen, and the violent combustion process. Therefore, how to control the injection and atomization of the fuel by the injector determines the stability of the combustion in the combustion chamber and the engine performance. Summary of the invention

[0004] In order to achieve stable combustion of a scramjet engine under extreme thermophysical conditions of high speed, high temperature and high pressure and ensure combustion stability in the combustion chamber and engine performance, the present invention discloses a ramjet engine pintle injector control device, which includes a pressure sensor, a pressure chamber and a control component.

[0005] The pressure sensor is arranged at the top of the pintle injector, and the outer wall of the pressure chamber is connected to the pintle injector housing. An elastic device is arranged in the pressure chamber, and the elastic device is connected to the tail end of the pintle that passes through the pintle injector housing and enters the pressure chamber. The control component controls the elasticity of the elastic device so that the elastic device drives the pintle to move and adjust the fuel injection pressure.

[0006] Furthermore, the elastic device includes an elastic member and a connecting plate, and the connecting plate is slidably disposed in the pressure chamber to divide the pressure chamber into a first chamber and a second chamber. One side of the connecting plate is connected to the tail end of the needle bolt located in the first chamber, and the other side is connected to the elastic member located in the second chamber.

[0007] Furthermore, the control component includes a controller and a solenoid valve, the controller is connected to the pressure sensor and the solenoid valve, the solenoid valve is arranged on a medium pipeline connected to the first chamber, the medium input or output of the first chamber flows in the medium pipeline, and the controller controls the on and off of the solenoid valve according to the pressure sensor reading.

[0008] Furthermore, in the pressure sensor, the medium is any one of driving oil, deionized water and gas.

[0009] Furthermore, the medium pipeline includes a first pipeline and a second pipeline, the first pipeline is used to input the medium into the first chamber, the second pipeline is used to discharge the medium from the first chamber, and the solenoid valve includes a first solenoid valve arranged on the first pipeline and a second solenoid valve arranged on the second pipeline.

[0010] The embodiment of the present invention further provides a control method for a ramjet engine pintle injector control device, wherein the control method controls the ramjet engine pintle injector control device to adjust the fuel injection pressure of the pintle injector, and the control method includes:

[0011] S1. Calculate the difference between the preset fuel pressure and the collected current fuel injection pressure to obtain a pressure difference, and calculate the pressure difference change rate according to the pressure difference;

[0012] S2. Outputting a control instruction to a control component through a fuzzy control algorithm according to the pressure difference and the pressure difference change rate;

[0013] S3. The control component acts according to the control instruction to adjust the elasticity of the elastic device, and the elastic device drives the pintle to move to adjust the fuel injection pressure.

[0014] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, any of the above-mentioned control methods for the ramjet engine pintle injector control device is implemented.

[0015] An embodiment of the present invention further provides a computer-readable storage medium storing a computer program for executing any of the above-mentioned control methods for the ramjet engine pintle injector control devices.

[0016] Compared with the prior art, the beneficial effects that can be achieved by at least one of the above technical solutions adopted in the embodiments of this specification include at least: the control device and control method of the ramjet engine pintle injector proposed by the present invention have a simple structure and a simple and effective control method, and can control the pressurization, injection, atomization, combustion and other processes of the fuel in the combustion chamber with a small resource expenditure, thereby ensuring the stability and reliability of the control process. At the same time, the full-authority open bang-bang self-tuning control method based on fuzzy control can reach a stable state faster than ordinary bang-bang control, and the dynamic process is also more stable and less volatile. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of a pintle injector control device for a ramjet engine disclosed in an embodiment of the present invention;

[0019] Figure 2 A flow chart of a control method of a ramjet engine pintle injector control device disclosed in an embodiment of the present invention;

[0020] Among them, 1. pressure sensor; 2. pressure chamber; 21. first chamber; 22. second chamber; 3. elastic device; 31. elastic member; 32. connecting plate; 4. pin; 5. first solenoid valve; 6. second solenoid valve. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0022] The following describes the implementation methods of the present application through specific specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and the features of the embodiments can be combined with each other in the absence of conflict. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without making creative work belong to the scope of protection of the present application.

[0023] The embodiment of the present invention discloses a ramjet engine pintle injector control device, see Figure 1 As shown, the control device includes a pressure sensor 1, a pressure chamber 2 and a control component. The pressure sensor 1 is arranged at the fuel injection outlet of the pintle injector, and the outer wall of the pressure chamber 2 is connected to the pintle injector housing. An elastic device 3 is arranged in the pressure chamber 2, and the elastic device 3 is connected to the tail end of the pintle 4 that passes through the pintle injector housing and enters the pressure chamber 2. The control component controls the elasticity of the elastic device 3 so that the elastic device 3 drives the pintle 4 to move and adjust the fuel injection pressure.

[0024] In an alternative embodiment, see Figure 1 As shown, the elastic device 3 includes an elastic member 31 and a connecting plate 32. The connecting plate 32 is slidably disposed in the pressure chamber 2 to divide the pressure chamber 2 into a first chamber 21 and a second chamber 22. One side of the connecting plate 32 is connected to the tail end of the pintle 4 in the first chamber 21, and the other side is connected to the elastic member 31 in the second chamber 22. In a specific implementation, the elastic member 31 can be a spring, one end of which is fixed on the inner wall of the second chamber 22, and the other end is connected to the connecting plate 32. The spring can be set to a certain compression amount according to a preset fuel pressure. Preferably, in order to prevent the medium in the first chamber 21 from flowing into the second chamber 22 through the connecting plate 32 and the pressure chamber 2, a sealing ring is provided at the position where the outer periphery of the connecting plate 32 contacts the inner wall of the pressure chamber 2.

[0025] In an optional embodiment, the control component includes a controller and a solenoid valve, the controller is connected to the pressure sensor 1 and the solenoid valve, the solenoid valve is arranged on a medium pipeline connected to the first chamber 21, the medium input or output of the first chamber 21 flows in the medium pipeline, and the controller controls the on and off of the solenoid valve according to the pressure sensor reading.

[0026] Furthermore, the medium is any one of driving oil, deionized water and gas. In this specific embodiment, driving oil is preferably selected as the medium for inputting into the first chamber 21 and outputting from the first chamber 21 .

[0027] In an optional embodiment, the medium pipeline includes a first pipeline and a second pipeline, the first pipeline is used to input the medium into the first chamber 21, and the second pipeline is used to discharge the medium from the first chamber 21, see Figure 1As shown, the solenoid valve includes a first solenoid valve 5 arranged on the first pipeline and a second solenoid valve 6 arranged on the second pipeline. When the two solenoid valves are controlled by the controller, when the first solenoid valve 5 is opened and the second solenoid valve 6 is closed, the driving oil is input into the first chamber 21 through the first pipeline, and the pressure of the first chamber 21 increases so that the connecting plate 32 drives the pintle 4 to move toward the second chamber 22, and the fuel injection pressure will decrease at this time; when the first solenoid valve 5 is closed and the second solenoid valve 6 is opened, the driving oil is discharged from the second chamber 22 through the second pipeline, the pressure of the first chamber 21 decreases, and the compressed spring drives the connecting plate 32 to drive the pintle 4 to move toward the first chamber 21, and the fuel injection pressure will increase at this time. By controlling the on-off time of the first solenoid valve 5 opening and the second solenoid valve 6 closing, the relative pressure between the first chamber 21 and the second chamber 22 can be adjusted, and then the gap between the pintle 4 and the fuel nozzle is adjusted to achieve real-time adjustment of the fuel injection pressure, so as to control the fuel atomization process.

[0028] The embodiment of the present invention also provides a control method for a ramjet engine pintle injector control device, wherein the control method controls the ramjet engine pintle injector control device to adjust the fuel injection pressure of the pintle injector, see Figure 2 As shown, the control method includes:

[0029] S1. Calculate the difference between the preset fuel pressure and the collected current fuel injection pressure to obtain a pressure difference, and calculate the pressure difference change rate according to the pressure difference;

[0030] S2. Outputting a control instruction to a control component through a fuzzy control algorithm according to the pressure difference and the pressure difference change rate;

[0031] S3. The control component acts according to the control instruction to adjust the elasticity of the elastic device, and the elastic device drives the pintle to move to adjust the fuel injection pressure.

[0032] In specific implementation, the real-time regulation process of fuel injection pressure is as follows:

[0033] Step 1: setting the differential pressure control timing of the fuel injection pressure of the pintle injector, and realizing the differential pressure control by controlling the on and off of the first solenoid valve 5 and the second solenoid valve 6;

[0034] Step 2: According to the pressure difference reading collected in real time, when the pressure difference is greater than zero, the first solenoid valve 5 is opened at a high frequency and the second solenoid valve 6 is closed, so as to increase the amount of oil in the first chamber 21, so that the elastic member is compressed again, and the pintle 4 is driven to move away from the fuel nozzle. At this time, the injection pressure of the sprayed fuel is reduced until the pressure difference meets the requirement, and the first solenoid valve 5 is controlled to be disconnected and the second solenoid valve 6 is closed;

[0035] When the pressure difference is less than zero, the second solenoid valve 6 is opened at high frequency and the first solenoid valve 5 is closed, thereby reducing the amount of oil entering the first chamber 21. The compressed elastic member performs a reset movement, driving the pintle 4 to move toward the fuel nozzle. At this time, the injection pressure of the sprayed fuel increases until the pressure difference meets the requirement, and the first solenoid valve 5 is controlled to be disconnected and the second solenoid valve 6 is closed.

[0036] When controlling the on and off of the two solenoid valves, it is difficult to obtain an accurate mathematical model of the pintle injector control unit, and taking into account the mechanical delay and other characteristics of the solenoid valve, a control method of full-authority open Bang-bang self-tuning control is selected in the embodiment of the present invention. This method uses Bang-bang control as the main control idea, draws on the central idea of ​​fuzzy control, and uses the pressure difference and pressure difference change rate between the given pressure (i.e., the preset fuel pressure) and the actual pressure (i.e., the fuel injection pressure) collected by the pressure sensor as the transformation input to adapt to the on and off control of the two solenoid valves, and self-tunes the on and off control parameters.

[0037] In the specific implementation, according to the research experience and engineering experiments, five fuzzy subsets of "positive large", "positive small", "zero", "negative small" and "negative large" are selected to represent the pressure difference E and the pressure difference change rate EC; and five open on-off control parameters of "adjusting the full duty cycle F of the pulse width (the duty cycle is set to 100%)", "adjusting the large duty cycle L of the pulse width (the duty cycle is set to 75%)", "adjusting the medium duty cycle M of the pulse width (the duty cycle is set to 50%)", "adjusting the small duty cycle S of the pulse width (the duty cycle is set to 25%)", and "turning off the solenoid valve Z (the duty cycle is set to 0%)" are set. They represent the on-off control parameters for adjusting the two solenoid valves. The pulse width adjustment frequency is 100Hz. The on-off control parameter logic is shown in the following Table 1 (1 and 2 are used in the table to represent the first solenoid valve and the second solenoid valve respectively):

[0038] Table 1: On / off control logic of two solenoid valves

[0039]

[0040] The control device and control method of the ramjet engine pintle injector proposed by the present invention have a simple structure and a simple and effective control method, and can control the processes of pressurization, injection, atomization, combustion, etc. of the fuel in the combustion chamber with a small resource expenditure, thereby ensuring the stability and reliability of the control process. At the same time, the full-authority open bang-bang self-tuning control method based on fuzzy control is adopted to reach a stable state faster than ordinary bang-bang control, and the dynamic process is also more stable and less volatile.

[0041] In this embodiment, a computer device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, any of the above-mentioned control methods for the ramjet engine pintle injector control device is implemented.

[0042] Specifically, the computer device may be a computer terminal, a server or a similar computing device.

[0043] In this embodiment, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores a computer program for executing any of the above-mentioned control methods for the ramjet engine pintle injector control device.

[0044] Specifically, computer-readable storage media include permanent and non-permanent, removable and non-removable media that can store information by any method or technology. Information can be computer-readable instructions, data structures, program modules or other data. Examples of computer-readable storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, tape disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable storage media does not include transitory media such as modulated data signals and carrier waves.

[0045] Obviously, those skilled in the art should understand that the modules or steps of the above-mentioned embodiments of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that here, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. In this way, the embodiments of the present invention are not limited to any specific combination of hardware and software.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the embodiments of the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A ramjet engine pintle injector control device, characterized in that: It comprises a pressure sensor (1), a pressure chamber (2) and a control component, wherein the pressure sensor (1) is arranged at the fuel injection outlet of the pintle injector, and the outer wall of the pressure chamber (2) is connected to the pintle injector housing; An elastic device (3) is provided in the pressure chamber (2), and the elastic device (3) is connected to the tail end of the pintle (4) that passes through the pintle injector housing and enters the pressure chamber (2); The control component controls the elasticity of the elastic device (3), so that the elastic device (3) drives the needle bolt (4) to move and adjust the fuel injection pressure.

2. The ramjet engine pintle injector control device according to claim 1, characterized in that: The elastic device (3) comprises an elastic member (31) and a connecting plate (32). The connecting plate (32) is slidably arranged in the pressure chamber (2) to divide the pressure chamber (2) into a first chamber (21) and a second chamber (22). One side of the connecting plate (32) is connected to the tail end of the pintle (4) located in the first chamber (21), and the other side is connected to the elastic member (31) located in the second chamber (22).

3. The ramjet engine pintle injector control device according to claim 2, characterized in that: The control component comprises a controller and a solenoid valve, wherein the controller is connected to the pressure sensor (1) and the solenoid valve, the solenoid valve is arranged on a medium pipeline connected to the first chamber (21), a medium input into or output from the first chamber (21) flows through the medium pipeline, and the controller controls the on and off of the solenoid valve according to the pressure sensor reading.

4. The ramjet engine pintle injector control device according to claim 3, characterized in that: The medium is any one of driving oil, deionized water and gas.

5. The ramjet engine pintle injector control device according to claim 3, characterized in that: The medium pipeline comprises a first pipeline and a second pipeline, the first pipeline is used to input the medium into the first chamber (21), and the second pipeline is used to discharge the medium from the first chamber (21), and the solenoid valve comprises a first solenoid valve (5) arranged on the first pipeline and a second solenoid valve (6) arranged on the second pipeline.

6. A control method for a ramjet pintle injector control device, characterized in that: The control method controls the ramjet engine pintle injector control device according to any one of claims 1 to 5 to adjust the fuel injection pressure of the pintle injector, and the control method includes: Calculate the difference between the preset fuel pressure and the collected current fuel injection pressure to obtain a pressure difference, and calculate the pressure difference change rate based on the pressure difference; Outputting a control instruction to a control component through a fuzzy control algorithm according to the pressure difference and the pressure difference change rate; The control component acts according to the control instruction to adjust the elasticity of the elastic device, and the elastic device drives the pintle to move to adjust the fuel injection pressure.

Images