摘要
当冲压发动机超声速进气道工作在一定条件下时,会出现自激振荡现象.采用数值模拟方法研究了某超声速进气道结构的自激振荡现象,分析了振荡时进气道内流场的变化过程.研究表明发生自激振荡时进气道中流动产生大幅脉动,造成进气道壁板结构承受周期变化的气动载荷,载荷振荡频谱中包含多个特征频率,其与声模态频率相重合,表明自激振荡现象与声模态的相关性.
Self-excited oscillation may arise when the inlet of ramjet is under a certain condition. This phenomenon for a supersonic inlet was numerically studied, and changes in fluid flow fields were analyzed. The results demonstrate that, in the occurrence of oscillation, the fluid flow in inlet generates large amplitude, resulting in violent periodic aerodynamic loads on ramjet wall structures. The frequency spectrum of oscillation comprises some characteristic frequencies similar with acoustic modal frequencies, implying a close relationship between acoustic modes and self-excited oscillation.
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2008年第9期1595-1602,共8页
Journal of Aerospace Power
