火箭推进2026，Vol.52Issue(4)：33-41,91,10.DOI:10.3969/j.issn.1672-9374.2026.04.004
富氧燃气发生器高压缩尺模拟实验系统低频耦合稳定性分析
Analysis of low-frequency coupled stability in a high-pressure scaled experimental system for an oxygen-rich gas generator
摘要
Abstract
To investigate the low-frequency oscillation observed in a high-pressure scaled experimental system for a liquid oxygen/methane oxygen-rich gas generator,a linearized transfer matrix model was established for each component in the system.The amplitude-frequency response of the simulated combustion chamber pressure perturbation relative to propellant flow rate disturbances,as well as the injector admittances for both the liquid oxygen and methane supply systems,were computed.The low-frequency coupled stability of the experimental system under various conditions was analyzed using the Nyquist stability criterion.The calculated results are in good agreement with the experimental observations.Within the low-frequency range,both the liquid oxygen and methane flow rates exhibit significant responses to combustion chamber pressure pulsations.The coupling between the flow rate pulsation in the methane supply system and the simulated combustion chamber pressure pulsation is identified as the cause of the low-frequency oscillation.It is found that increasing the methane injector pressure drop,decreasing the total volume of pipelines and cavities in the supply system,and increasing the gas residence time are all effective measures for enhancing the system's low-frequency coupled stability.These measures are capable of reducing the feedback of methane flow rate pulsations and the feedback of chamber pressure on propellant flow rate pulsations,respectively.关键词
低频振荡/富氧燃气发生器/耦合稳定性/喷前腔容积/燃气停留时间Key words
low-frequency combustion oscillation/oxygen-rich gas generator/coupled stability/pre-injector chamber volume/gas residence time分类
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刘云浩,王春民,鲍航宇,刘昭宇,李龙飞..富氧燃气发生器高压缩尺模拟实验系统低频耦合稳定性分析[J].火箭推进,2026,52(4):33-41,91,10.基金项目
全国重点实验室基金(HTKL2024KL011006) （HTKL2024KL011006）
