Starting control method for start-up state transition of flow regulator

By setting a differential pressure sensor in the first throttling window of the flow regulator and using a motor to control the opening of the flow regulator, flow control during the starting process of a full-flow afterburning cycle engine is achieved, solving the problem of uncontrolled flow and improving the reliability of engine starting.

WO2026124374A1 Publication Date: 2026-06-18XIAN AEROSPACE PROPULSION INST
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
XIAN AEROSPACE PROPULSION INST
Filing Date
2025-12-05
Publication Date
2026-06-18

AI Technical Summary

⚠Technical Problem

During the start-up process of a full-flow afterburning cycle engine, the flow regulator's flow rate becomes uncontrollable, making it difficult to control the mixture ratio of the gas generator and easily leading to ablation. Existing technologies struggle to solve this problem.

⚗Method used

A differential pressure sensor is installed in the first throttling window of the flow regulator. The differential pressure ΔP is detected by the differential pressure sensor. The area change rate δA or area A of the first throttling window is calculated based on the differential pressure and the preset flow rate. The opening degree of the flow regulator is controlled by the motor to realize the closed-loop control of the flow regulator.

🎯Benefits of technology

It broadens the boundary of flow stability of the flow regulator, improves the reliability of engine starting, and solves the energy control problem in the starting process of a full-flow afterburning cycle engine.

✦ Generated by Eureka AI based on patent content.

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Abstract

A staring control method for start-up state transition of a flow regulator, comprising: providing a differential pressure sensor at a first throttling window of a flow regulator, and obtaining a differential pressure ΔP at the first throttling window on the basis of the differential pressure sensor; if the differential pressure ΔP at the first throttling window is less than a preset start-up pressure drop, obtaining an area change rate δA of the first throttling window on the basis of the differential pressure ΔP at the first throttling window and a preset flow rate ṁ, and performing control and regulation by means of a motor, thereby satisfying a preset flow rate demand; and if the differential pressure ΔP at the first throttling window is not less than the preset start-up pressure drop, obtaining an area A of the first throttling window on the basis of the preset flow rate ṁ, and controlling, by the motor, the flow regulator to enable the area of the first throttling window to be A, thereby maintaining flow rate stability of the flow regulator and improving the starting reliability of a full-flow liquid oxygen / methane staged combustion cycle engine.
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