摘要
针对液氧在液体火箭发动机波纹管内的非定常流动,建立了二维数学模型,采用大涡模拟方法模拟了波纹管褶合处周期性的涡脱落现象。基于控制变量法,分析了液氧流动速度、波纹管几何参数对涡脱落频率的影响。结果表明:波纹管涡脱落运动的频率与液氧流动速度近似成正比,与波纹管褶合的特征长度近似成反比。在此基础上,归纳出了计算波纹管涡脱落频率的经验式。
Aiming at the unsteady flow of liquid oxygen in the bellows of the liquid rocket engine,a twodimensional mathematical model is established for the unsteady flow of liquid oxygen in metal bellows of the liquid rocket engine. The large eddy simulation method is used to simulate the periodic vortex shedding phenomenon at the bellows convolution. The variable-controlling approach is used to analyze the influence of the liquid oxygen mean flow velocity and the bellows geometry on the vortex shedding. The results show that the frequency of vortex shedding in the bellows is approximately proportional to the liquid oxygen mean flow velocity,and is inversely proportional to the characteristic length of the bellows convolution. On this basis,an empirical formula for calculating the frequency of the vortex shedding of the bellows is derived.
作者
严伟
朱景文
周卫雪
YAN Wei;ZHU Jingwen;ZHOU Weixue(Land Space Technology Corporation Ltd.Beijing,100176 China;Beijing Institute of Space Long March Vehicle Beijing,100076 China)
出处
《上海航天（中英文）》
CSCD
2020年第6期137-142,共6页
Aerospace Shanghai（Chinese&English）
关键词
波纹管
液氧
涡脱落
频率
流动速度
特征长度
metal bellows
liquid oxygen
vortex shedding
frequency
flow velocity
characteristic length
