A starting control method for the start-up state transition of a flow regulator

Abstract

This invention discloses a starting control method for the start-up state transition of a flow regulator, comprising: setting a differential pressure sensor in the first throttling window of the flow regulator, and obtaining the differential pressure ΔP of the first throttling window based on the differential pressure sensor; if the differential pressure ΔP of the first throttling window is less than a preset start-up pressure drop, then obtaining the area change rate δA of the first throttling window based on the differential pressure ΔP and a preset flow rate, and controlling the adjustment via a motor to meet the preset flow rate requirement; if the differential pressure ΔP of the first throttling window is not less than the preset start-up pressure drop, then obtaining the area A of the first throttling window based on the preset flow rate, and controlling the flow regulator with the motor to make the area of ​​the first throttling window A. This invention solves the problem of energy control during the starting process of a full-flow afterburning cycle engine and improves the reliability of engine starting.

Description

Technical Field

[0001] This invention belongs to the field of full-flow afterburning cycle engine technology, and particularly relates to a starting control method for the start-up control state transition of a flow regulator. Background Technology

[0002] The full-flow staged combustion cycle engine does not rely on external starting energy when starting, but adopts a self-starting scheme based on the rocket tank pressure. The energy matching process during its start-up is a difficult point in engine design.

[0003] For a full-flow liquid oxygen-methane afterburning cycle engine, the generator fuel circuit is equipped with a flow regulator. The flow rate of the auxiliary fuel circuit of the gas generator during startup, transition, and operation is controlled by the flow regulator, thereby achieving precise regulation and control of engine power and thrust. Unlike the liquid oxygen-kerosene afterburning cycle engine system, where the inlet pressure of the flow regulator often reaches above 20 MPa during startup, resulting in sufficient pressure drop and stable flow control, the inlet pressure of the flow regulator in the full-flow afterburning cycle system is the pump outlet pressure. Due to the pump's self-flow resistance and the influence of low inlet pressure during startup, the inlet pressure of the flow regulator is around 0.2-0.4 MPa, which is far lower than the starting pressure drop of the flow regulator.

[0004] In the existing technology, the flow regulator opening is kept fixed. When the pressure drop decreases, the flow through the regulator gradually decreases. When the pressure drop increases, the flow increases rapidly. Therefore, during the start-up process, the flow of the regulator is in an uncontrolled state, which is not conducive to the control of the gas generator mixture ratio and can easily lead to the gas generator burning. Summary of the Invention

[0005] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a starting control method for the starting state transition of a flow regulator, which solves the problem of energy control during the starting process of a full-flow afterburning cycle engine and improves the starting reliability of the engine.

[0006] The objective of this invention is achieved through the following technical solution: a start-up control method for the start-up state transition of a flow regulator, comprising: setting a differential pressure sensor in the first throttling window of the flow regulator, obtaining the differential pressure ΔP of the first throttling window based on the differential pressure sensor; if the differential pressure ΔP of the first throttling window is less than a preset start-up pressure drop, then based on the differential pressure ΔP of the first throttling window and a preset flow rate... The rate of change of the area of ​​the first throttling window, δA, is obtained; if the pressure difference ΔP of the first throttling window is not less than the preset starting pressure drop, then the preset flow rate is used. The area A of the first throttling window is obtained, and the motor controls the flow regulator to make the area of ​​the first throttling window A.

[0007] In the above-mentioned start-up control method for the flow regulator's start-up state transition, the rate of change of the first throttling window area δA is obtained by the following formula:

[0008]

[0009] Where δA is the rate of change of the area of ​​the first throttling window. The preset flow rate is given by ρ, the medium density is given by ΔP, the pressure difference of the first throttling window is given by δΔP, and the rate of change of the pressure difference of the first throttling window is given by δΔP.

[0010] In the above-mentioned start-up control method for the start-up state transition of the flow regulator, the area A of the first throttling window is obtained by the following formula:

[0011]

[0012] Where A is the area of ​​the first throttling window, and k is a proportionality coefficient. Preset flow rate.

[0013] The above-mentioned starting control method for the start-up state transition of the flow regulator also includes: when the pressure difference ΔP of the first throttling window is less than the preset start-up pressure drop, the motor controls the first throttling window of the flow regulator according to the rate of change of the area of ​​the first throttling window δA.

[0014] The above-mentioned starting control method for the flow regulator's start-up state transition also includes: when the pressure difference ΔP of the first throttling window is not less than the preset start-up pressure drop, the motor controls the flow regulator to make the area of ​​the first throttling window A.

[0015] In the above-mentioned start-up control method for the start-up state transition of the flow regulator, if the pressure difference ΔP of the first throttling window is less than the preset start-up pressure drop, it indicates that the flow regulator is in the non-start-up state.

[0016] In the above-mentioned start-up control method for the start-up state transition of the flow regulator, if the pressure difference ΔP of the first throttling window is not less than the preset start-up pressure drop, it indicates that the flow regulator is in the start-up state.

[0017] In the above-mentioned start-up control method for the start-up state transition of the flow regulator, when the flow regulator is in the start-up state, the preset flow rate is proportional to the area of ​​the first throttling window.

[0018] A start-up control system for a flow regulator's start-up state transition includes: a first module, configured to, if the pressure difference ΔP of the first throttling window is less than a preset start-up pressure drop, adjust the start-up control based on the pressure difference ΔP of the first throttling window and a preset flow rate... The first module obtains the rate of change of the area of ​​the first throttling window, δA; the second module is used to determine the flow rate based on the preset flow rate if the pressure difference ΔP of the first throttling window is not less than the preset starting pressure drop. The area A of the first throttling window is obtained, and the motor controls the flow regulator to make the area of ​​the first throttling window A.

[0019] In the starting control system for the aforementioned flow regulator's start-up state transition, the rate of change δA of the first throttling window area is obtained using the following formula:

[0020]

[0021] Where δA is the rate of change of the area of ​​the first throttling window. The preset flow rate is given by ρ, the medium density is given by ΔP, the pressure difference of the first throttling window is given by δΔP, and the rate of change of the pressure difference of the first throttling window is given by δΔP.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] This invention broadens the boundary of flow stability of the flow regulator, solves the problem of energy control during the starting process of a full-flow afterburning cycle engine, and improves the reliability of engine starting. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0025] Figure 1 This is a flowchart of closed-loop control based on the pressure drop of the first throttling window of the flow regulator, provided in an embodiment of the present invention. Detailed Implementation

[0026] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the disclosure to those skilled in the art. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] Figure 1 This is a flowchart of a closed-loop control based on the pressure drop of the first throttling window of the flow regulator, provided in an embodiment of the present invention. (Combined with...) Figure 1 This embodiment provides a starting control method for the start-up state transition of a flow regulator, which includes the following steps:

[0028] A differential pressure sensor is installed in the first throttling window of the flow regulator, and the differential pressure ΔP of the first throttling window is obtained from the differential pressure sensor.

[0029] If the pressure difference ΔP of the first throttling window is less than the preset starting pressure drop, then based on the pressure difference ΔP of the first throttling window and the preset flow rate... The rate of change of the area of ​​the first throttling window is obtained, δA. The motor controls the first throttling window of the flow regulator based on the rate of change of the area of ​​the first throttling window, δA.

[0030] If the pressure difference ΔP of the first throttling window is greater than the preset starting pressure drop, then according to the preset flow rate... The area A of the first throttling window is obtained (in the initial adjustment state, the second flow rate is preset to be proportional to the area of ​​the first throttling window), and the motor controls the flow regulator to make the area of ​​the first throttling window A.

[0031] The rate of change of the area of ​​the first throttling window, δA, is obtained by the following formula:

[0032]

[0033] Where δA is the rate of change of the area of ​​the first throttling window. The preset flow rate is given by ρ, the medium density is given by ΔP, the pressure difference of the first throttling window is given by δΔP, and the rate of change of the pressure difference of the first throttling window is given by δΔP.

[0034] The area A of the first throttling window is obtained by the following formula:

[0035]

[0036] Where A is the area of ​​the first throttling window, and k is a proportionality coefficient. The preset traffic is the second preset traffic.

[0037] If the pressure difference ΔP of the first throttling window is less than the preset starting pressure drop, it indicates that the flow regulator is in the non-adjustment state. If the pressure difference ΔP of the first throttling window is not less than the preset starting pressure drop, it indicates that the flow regulator is in the adjustment state.

[0038] When the flow regulator is in the initial adjustment condition, the pressure drop of the first throttling window is kept basically constant through the feedback control of the slide valve itself. When the pressure drop of the first throttling window is exceeded, the regulator will no longer maintain a constant pressure drop, and the regulator will be in the non-adjustment state.

[0039] Therefore, based on the starting pressure drop of the flow regulator under different flow rates, a control function for the opening degree and pressure drop of the first throttling window of the flow regulator is established. During engine start-up, the flow rate through the flow regulator is used as the regulation target, the pressure drop of the first window of the flow regulator is measured as the input condition, and the opening degree of the first throttling window is used as the output condition. The electromechanical servo control system is used to perform closed-loop control of the flow regulator in the non-adjustment state.

[0040] The closed-loop control flowchart based on the pressure drop of the first throttling window of the flow regulator is as follows: Figure 1 As shown, the flow rate is used as the input condition. Through the control algorithm in the controller, combined with the flow rate input and the flow rate feedback parameters under the current window area and pressure drop, the drive motor adjusts and controls the opening of the first throttling window of the flow regulator.

[0041] The specific implementation steps are as follows:

[0042] a) Determine the flow input of the flow regulator in the non-adjustment state based on the engine starting parameter requirements;

[0043] b) Determine the relationship between the area of ​​the first throttling window and the pressure drop of the flow regulator and its flow rate through ground tests or simulations;

[0044] c) Install a differential pressure sensor in the first throttling window of the flow regulator to sense the pressure drop in the throttling window. Obtain the motor rotation angle through the motor rotary transformer to determine the location of the flow regulator sleeve. Interpolate to determine the area of ​​the first throttling window.

[0045] d) Establish the relationship between the rate of change of the area of ​​the first throttling window of the flow regulator and the pressure drop under a fixed flow rate, as follows:

[0046]

[0047] Where: δA is the rate of change of the area of ​​the first throttling window; ρ is the preset flow rate; ρ is the medium density; ΔP is the pressure difference of the first throttling window; δΔP is the rate of change of the pressure difference of the first throttling window.

[0048] e) At the starting flow rate, the area of ​​the first throttling window of the flow regulator is adjusted in real time through the control function established above, so as to realize the flow control of the flow regulator in the non-adjustment state.

[0049] Based on the characteristics of the engine system, the operation of the flow regulator is set to two stages during the start-up process: no adjustment state and adjustment state. The pressure drop of the first-level window is monitored in real time, and the control strategy of the flow regulator is adjusted after the switching conditions are met.

[0050] The specific steps are as follows:

[0051] a) Real-time monitoring of the pressure drop at the first throttling window of the flow regulator, and comparison with the starting pressure drop obtained under different flow rates obtained in the experiment;

[0052] b) When the pressure drop of the first throttling window exceeds the starting pressure drop at the current flow rate, the opening of the flow regulator is fixed. After the flow regulator is in the starting state for 0.2 seconds, the first throttling window closed-loop control scheme based on flow rate is exited.

[0053] c) During the startup process, the control scheme of the flow regulator after the initial adjustment is adjusted to an open-loop control scheme of angle and flow. At this time, the flow regulator performs stage transition and operating condition adjustment according to the preset angle.

[0054] d) If the flow regulator is still in an unadjusted working state before starting the transition stage, the measurement system will issue a fault alarm to the test bench, indicating that the engine is working abnormally, and the engine will execute an emergency shutdown procedure and will not start.

[0055] This embodiment also provides a start-up control system for the start-up state transition of a flow regulator, including: a first module, used to, if the pressure difference ΔP of the first throttling window is less than a preset start-up pressure drop, determine the start-up control system based on the pressure difference ΔP of the first throttling window and a preset flow rate. The first module obtains the rate of change of the area of ​​the first throttling window, δA; the second module is used to determine the flow rate based on the preset flow rate if the pressure difference ΔP of the first throttling window is not less than the preset starting pressure drop. The area A of the first throttling window is obtained, and the motor controls the flow regulator to make the area of ​​the first throttling window A.

[0056] This embodiment solves the problem of energy control during the starting process of a full-flow afterburning cycle engine, and improves the reliability of engine starting.

[0057] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make possible changes and modifications to the technical solutions of the present invention by utilizing the methods and techniques disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solutions of the present invention shall fall within the protection scope of the technical solutions of the present invention.

Claims

1. A start control method of a start state transition of a flow regulator of a full-flow staged combustion cycle engine, characterized by Comprising: setting a pressure difference sensor at the first throttle window of the flow regulator, and obtaining the pressure difference of the first throttle window according to the pressure difference sensor; if the pressure difference of the first throttle window is less than a preset pressure drop for starting regulation, then obtaining the area change rate of the first throttle window according to the pressure difference of the first throttle window and a preset flow rate; if the pressure difference of the first throttle window is not less than the preset pressure drop for starting regulation, then obtaining the area A of the first throttle window according to the preset flow rate; The first throttle window area change rate This is obtained by the equation: ； wherein, is a first throttle window area change rate, is a preset flow rate, is a medium density, is a first throttle window pressure difference, is a first throttle window pressure difference change rate; the area A of the first throttle window is obtained by the following formula: ； wherein, is the area of the first throttle window, is a positive proportionality coefficient, is a preset flow rate; Also included is a first throttle window pressure differential Less than a preset pickup pressure drop, the motor according to the first throttle window area rate of change The first throttle window area of the flow regulator is controlled, and then the flow is kept constant; Also included is a first throttle window pressure differential Not less than the preset pressure drop, the motor control flow regulator makes the area of the first throttle window A.

2. The start-up control method of the start-up state transition of the flow regulator of the full-flow post combustion cycle engine according to claim 1, characterized by: If the first throttle window pressure differential is less than a preset pickup pressure drop, it indicates that the flow regulator is in an unregulated state.

3. The start control method of the on-state transition of the flow regulator according to claim 1, characterized by: If the first throttle window pressure difference If the first throttle window pressure difference is not less than the preset pressure drop, it indicates that the flow regulator is in the starting state.

4. The start-up control method of the start-up state transition of the flow regulator of the full-flow post combustion cycle engine according to claim 3, characterized by: when the flow regulator is in the starting regulation state, the preset flow rate is proportional to the area of the first throttle window.

5. A start control system for a flow regulator start state transition of a full flow staged combustion cycle engine, characterized by Comprising: The first module is configured to, if the first throttle window pressure difference is less than a preset pressure drop for starting adjustment, obtain a first throttle window area change rate according to the first throttle window pressure difference and a preset flow rate The first throttle window area change rate is obtained according to the first throttle window pressure difference and the preset flow rate The first throttle window area change rate is obtained according to the first throttle window pressure difference and the preset flow rate The first throttle window area change rate is obtained according to the first throttle window pressure difference and the preset flow rate The motor adjusts the first window area according to the area change rate, and then keeps the flow rate meeting the preset flow rate under different pressure differences ; a second module configured to, if the pressure difference of the first throttle window is not less than a preset pressure drop not less than a preset pressure drop, according to a preset flow obtain an area A of the first throttle window, and control the flow regulator to make the area of the first throttle window A; The first throttle window area change rate This is obtained by the equation: ； wherein, is a first throttle window area change rate, is a preset flow rate, is a medium density, is a first throttle window pressure difference, is a first throttle window pressure difference change rate; the area A of the first throttle window is obtained by the following formula: ； wherein, is the area of the first throttle window, is a positive proportionality coefficient, is a preset flow rate; Also comprising: a third module for maintaining the pressure difference of the first throttle window When the pressure drop is less than the preset pressure drop, the motor changes the area change rate of the first throttle window Controlling the area of the first throttle window of the flow regulator, thereby keeping the flow constant Further comprising: a fourth module for, when the first throttle window pressure difference is not less than the preset pressure drop starting value, the motor controls the flow regulator to make the area of the first throttle window A. Not less than the preset pressure drop starting value, the motor controls the flow regulator to make the area of the first throttle window A.

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