液氧煤油发动机氧系统双机耦合振荡频率特性  

Coupling Oscillation Frequency Characteristics of Oxygen System in Liquid Oxygen Kerosene Engine

作　　者：张淼 李程[1] 王飞[1] 闫胜 李斌[2] Zhang Miao;Li Cheng;Wang Fei;Yan Sheng;Li Bin(Xi’an Aerospace Propulsion Institute,Xi’an,710100;Academy of Aerospace Propulsion Technology,Xi’an,710100)

机构地区：[1]西安航天动力研究所,西安710100 [2]航天推进技术研究院,西安710100

出　　处：《导弹与航天运载技术》2022年第2期38-43,共6页Missiles and Space Vehicles

摘　　要：对双机并联液氧煤油发动机存在的氧系统低频振荡现象进行仿真研究。结合泵间管燃气掺混冷凝特性建立的燃气冷凝过程传递函数,基于分支管传递函数理论,进行了双机并联系统频率特性研究。分析了氧入口压力、氧输送管路长度和蓄压器PV值对频率特性的影响。飞行过程中氧入口压力升高,氧系统等效柔度减小,系统频率随之升高。7.5 Hz频率为双机耦合频率,与氧输送主管路特性无关,频率特性表现为振荡相位差180°、幅值相当。进一步增大蓄压器PV值和加速发动机燃气冷凝速率(减小等效气泡柔度)能够抑制低频振荡。The low frequency oscillation phenomenon of oxygen system in dual parallel liquid oxygen kerosene engine is simulated.Based on the transfer function model of gas condensation process established by gas injection and condensation distribution characteristics,and the branch pipe transfer function theory,the frequency characteristics of dual parallel system are studied.The effects of oxygen inlet pressure,oxygen main pipeline construction,and the PV value of accumulator on frequency characteristics are analyzed.During flight,the oxygen inlet pressure increases,the equivalent flexibility decreases,and the system frequency increases.The 7.5Hz frequency is the dual parallel coupling frequency,which is independent of the main pipeline length.The frequency characteristics are opposite to the oscillation phase,and the amplitude is approximately equal.Simulation results show that increasing the PV value of the accumulator and accelerating gas condensation(reducing equivalent bubble flexibility)can suppress low frequency oscillation.

关 键 词：耦合振荡 双机并联系统 燃气冷凝过程 传递函数 

分 类 号：V434.23[航空宇航科学与技术—航空宇航推进理论与工程]