液体火箭发动机燃烧室波动过程数值分析

NUMERICAL ANALYSIS OF ACOUSTICAL WAVE MOTION IN COMBUSTION CHAMBER OF LIQUID ROCKET ENGINE

关键词:  液体推进剂火箭发动机  燃烧稳定性  燃烧波  数值分析

Key words:  Liquid propellant rocket engine  Combustion stability  Combustion wave  Numerical analysis

摘要:

采用计算流体力学的方法，对液体火箭发动机燃烧室内波动过程进行了初步的探讨。采用两步ＰＩＳＯ算法，对流项采用二阶迎风格式，时空精度都为二阶。考察了方法的适用性，以及声学谐振器、声腔、隔板等燃烧不稳定抑制装置对燃烧室内波动过程的影响。结果表明，采用ＣＦＤ方法用于分析波动过程是可行的，谐振器、声腔与隔板对拢动波有明显的阻尼作用。

Abstract:

A preliminary study was carried out for wave motion in combustion chamber of liquid rocket engines by computational fluids dynamics method.The two stage PISO algorithm was emplopyed and the convection term was discretized by 2 order upwind scheme.The method had two order accuracy in time as well as in space.The feasibility of method was verified,and the effect of suppression devices of combustion instability such as acoustic resonator,acoustic cavity and baffle on wave motion in combustion chamber was studied.The results indicate that acoustic resonator,acoustic cavity and baffle have obvious damping effect on disturb wave,and the CFD method can be utilized for the analysis of acoustic wave motion process