Starting control method for switching starting state of flow regulator

Abstract

The invention discloses a starting control method for starting regulation state conversion of a flow regulator, which comprises the following steps of: arranging a differential pressure sensor at a first throttling window of the flow regulator, and obtaining the differential pressure delta P of the first throttling window according to the differential pressure sensor; if the pressure difference delta P of the first throttling window is smaller than the preset starting regulation pressure drop, the area change rate delta A of the first throttling window is obtained according to the pressure difference delta P of the first throttling window and the preset flow # imgabs0 #, control regulation is conducted through a motor, and the preset flow requirement is met; and if the pressure difference delta P of the first throttling window is not smaller than the preset starting regulation pressure drop, the area A of the first throttling window is obtained according to the preset flow # imgabs1 #, and the motor controls the flow regulator to enable the area of the first throttling window to be A. The problem of energy control in the full-flow afterburning cycle engine starting process is solved, and the engine starting reliability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of full-flow regenerative cycle engines, and in particular relates to a starting control method for switching starting states of a flow regulator. Background Art

[0002] The full-flow regenerative 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 of its starting process is a difficult point in engine design.

[0003] For the full-flow liquid oxygen-methane regenerative cycle engine, its generator fuel circuit is equipped with a flow regulator, and the flow of the fuel bypass of the gas generator during the starting stage and the working process is controlled by the flow regulator, so as to achieve precise regulation and control of the engine power and thrust. Different from the liquid oxygen-kerosene regenerative cycle engine system, the flow regulator inlet pressure often reaches more than 20MPa when the liquid oxygen-kerosene regenerative cycle engine system is started, the flow pressure drop is sufficient, and the flow control is stable. When the full-flow regenerative cycle system is started, the flow regulator inlet is the pump outlet pressure. Affected by the pump self-flow resistance and low inlet pressure starting, the flow regulator inlet pressure is about 0.2-0.4MPa, which is much lower than the starting pressure drop of the flow regulator.

[0004] In the prior art, the opening of the flow regulator remains fixed. When the pressure drop decreases, the flow through the regulator gradually decreases. When the pressure drop increases, the flow increases rapidly. During the startup process, the regulator flow is in an uncontrolled state, which is not conducive to the control of the gas generator mixing ratio and can easily cause ablation of the gas generator. Summary of the invention

[0005] The technical problem solved by the present invention is: to overcome the deficiencies of the prior art, to provide a starting control method for the flow regulator starting state transition, to solve the problem of energy control during the starting process of a full-flow regenerative cycle engine, and to improve the engine starting reliability.

[0006] The object of the present invention is achieved through the following technical solutions: A start-up control method for the start-up state transition of a flow regulator, comprising: setting a pressure difference sensor at the first throttling window of the flow regulator, obtaining the first throttling window pressure difference ΔP according to the pressure difference sensor; if the first throttling window pressure difference ΔP is less than a preset start-up pressure drop, then according to the first throttling window pressure difference ΔP and a preset flow Get the first throttling window area change rate δA; if the first throttling window pressure difference ΔP is not less than the preset starting pressure drop, then according to the preset flow The area A of the first throttling window is obtained, and the motor controls the flow regulator so that the area of ​​the first throttling window is A.

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

[0008]

[0009] Among them, δA is the change rate of the first throttling window area, is the preset flow rate, ρ is the medium density, ΔP is the pressure difference of the first throttling window, and δΔP is the change rate of the pressure difference of the first throttling window.

[0010] In the above-mentioned start-up control method for the flow regulator start-up state transition, 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, k is the proportional coefficient, The preset flow rate.

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

[0014] The above-mentioned start-up control method for switching the start-up state of the flow regulator 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 so that the area of ​​the first throttling window is A.

[0015] In the above-mentioned start-up control method for switching the start-up state of the flow regulator, if the first throttling window pressure difference ΔP 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 switching the start-up state of the flow regulator, if the first throttling window pressure difference ΔP 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 switching the flow regulator to the start-up state, when the flow regulator is in the start-up state, the preset flow is proportional to the area of ​​the first throttling window.

[0018] A flow regulator start-up control system for switching the start-up state, comprising: a first module for, if the first throttling window pressure difference ΔP is less than a preset start-up pressure drop, The first throttling window area change rate δA is obtained; the second module is used to adjust the pressure drop according to the preset flow rate if the first throttling window pressure difference ΔP 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 so that the area of ​​the first throttling window is A.

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

[0020]

[0021] Among them, δA is the change rate of the first throttling window area, is the preset flow rate, ρ is the medium density, ΔP is the pressure difference of the first throttling window, and δΔP is the change rate of the pressure difference of the first throttling window.

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

[0023] The present invention broadens the boundary of flow stability of the flow regulator, solves the problem of energy control in the starting process of a full-flow regenerative cycle engine, and improves the reliability of engine starting. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0025] Figure 1 It is a closed-loop control flow chart based on the pressure drop of the first throttling window of the flow regulator provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to be able to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] Figure 1 This is a closed-loop control flow chart based on the pressure drop of the first throttling window of the flow regulator provided by an embodiment of the present invention. Figure 1 This embodiment provides a method for controlling the start-up state transition of a flow regulator, the method comprising the following steps:

[0028] A pressure difference sensor is arranged at the first throttling window of the flow regulator, and a pressure difference ΔP of the first throttling window is obtained according to the pressure difference sensor;

[0029] If the first throttling window pressure difference ΔP is less than the preset starting pressure drop, the first throttling window pressure difference ΔP and the preset flow rate The first throttling window area change rate δA is obtained, and the motor controls the first throttling window of the flow regulator according to the first throttling window area change rate δA;

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

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

[0032]

[0033] Among them, δA is the change rate of the first throttling window area, is the preset flow rate, ρ is the medium density, ΔP is the pressure difference of the first throttling window, and δΔP is the change rate of the pressure difference of the first throttling window.

[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, k is the proportional coefficient, The preset flow rate is the preset second flow rate.

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

[0038] When the flow regulator is in the starting condition, the pressure drop of the first throttling window is basically maintained at a fixed state through the feedback control of the slide valve itself. When it exceeds the control range of the slide valve itself, the pressure drop of the first throttling window is no longer maintained constant, and the regulator is in a non-adjusting state.

[0039] Therefore, based on the starting pressure drop of the flow regulator under different flow rates, a control function of the opening and pressure drop of the first throttling window of the flow regulator is established. During the engine starting process, the flow passing through the flow regulator is used as the adjustment target, and the pressure drop of the first window of the flow regulator is measured as the input condition, and the opening 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 when it is not in the starting state.

[0040] The closed-loop control flow chart 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 an input condition. Through the control algorithm in the controller, combined with the flow input and the flow feedback parameters under the current window area and pressure drop, the driving 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-adjusting state according to the engine starting parameter requirements;

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

[0044] c) A differential pressure sensor is provided at the first throttling window of the flow regulator to sense the pressure drop at the throttling window, and the motor rotation angle is obtained through the motor rotary transformer, thereby determining the position of the flow regulator gear sleeve, and interpolating to determine the area of ​​the first throttling window;

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

[0046]

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

[0048] e) Under 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-adjusting state.

[0049] Based on the characteristics of the engine system solution, the flow regulator is set to work in two stages during the starting process, namely the non-adjustment state and the start-up state. The pressure drop of the first-level window is monitored in real time. When the conversion conditions are met, the control strategy of the flow regulator is adjusted.

[0050] The specific steps are as follows:

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

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

[0053] c) During the startup process, the control scheme of the flow regulator after the start-up is adjusted to an open-loop control scheme of angle and flow, at which time the flow regulator is switched and the working condition is adjusted according to the preset angle;

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

[0055] The present embodiment also provides a flow regulator start-up control system for switching the start-up state, comprising: a first module for, if the first throttling window pressure difference ΔP is less than the preset start-up pressure drop, The first throttling window area change rate δA is obtained; the second module is used to adjust the pressure drop according to the preset flow rate if the first throttling window pressure difference ΔP 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 so that the area of ​​the first throttling window is A.

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

[0057] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A method for controlling the start-up state transition of a flow regulator, characterized in that include: A pressure differential sensor is arranged at the first throttling window of the flow regulator, and the pressure differential of the first throttling window is obtained according to the pressure differential sensor; If the first throttling window pressure difference is less than the preset starting pressure drop, the first throttling window area change rate is obtained according to the first throttling window pressure difference and the preset flow rate; If the pressure difference of the first throttling window is not less than the preset starting pressure drop, the area A of the first throttling window is obtained according to the preset flow rate.

2. The method for controlling the start-up state transition of a flow regulator according to claim 1, characterized in that: The first throttling window area change rate δA is obtained by the following formula: Among them, δA is the change rate of the first throttling window area, is the preset flow rate, ρ is the medium density, ΔP is the pressure difference of the first throttling window, and δΔP is the change rate of the pressure difference of the first throttling window.

3. The method for controlling the start-up state transition of a flow regulator according to claim 1, characterized in that: The area A of the first throttling window is obtained by the following formula: Where A is the area of ​​the first throttling window, k is the proportional coefficient, The preset flow rate.

4. The method for controlling the flow regulator to start the state transition according to claim 1, characterized in that It also includes: when the first throttling window pressure difference ΔP is less than the preset starting pressure drop, the motor controls the first throttling window area of ​​the flow regulator according to the first throttling window area change rate δA, thereby keeping the flow constant.

5. The method for controlling the start-up state transition of a flow regulator according to claim 1, characterized in that It also includes: when the pressure difference ΔP of the first throttling window is not less than the preset starting pressure drop, the motor controls the flow regulator so that the area of ​​the first throttling window is A.

6. The method for controlling the start-up state transition of a flow regulator according to claim 1, characterized in that: If the first throttling window pressure difference ΔP is less than the preset starting pressure drop, it indicates that the flow regulator is in a non-adjusting state.

7. The method for controlling the start-up state transition of a flow regulator according to claim 1, characterized in that: If the first throttling window pressure difference ΔP is not less than the preset starting pressure drop, it indicates that the flow regulator is in the starting state.

8. The method for controlling the start-up state transition of a flow regulator according to claim 7, characterized in that: When the flow regulator is in the start-up state, the preset flow is proportional to the area of ​​the first throttling window.

9. A flow regulator start-up control system for switching the start-up state, characterized in that include: The first module is used for adjusting the pressure drop of the first throttling window according to the pressure difference ΔP of the first throttling window and the preset flow rate if the pressure difference ΔP of the first throttling window is less than the preset starting pressure drop. The first throttling window area change rate δA is obtained, and the motor adjusts the first-stage window area according to the area change rate, and then maintains the flow rate under different pressure differences to meet the preset flow rate The second module is used to adjust the flow rate according to 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 so that the area of ​​the first throttling window is A.

10. The flow regulator start-up control system according to claim 9, characterized in that: The first throttling window area change rate δA is obtained by the following formula: Among them, δA is the change rate of the first throttling window area, is the preset flow rate, ρ is the medium density, ΔP is the pressure difference of the first throttling window, and δΔP is the change rate of the pressure difference of the first throttling window.

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