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为了获取外界激励作用下旋转冲压转子进气道流场激励特性及性能的变化规律,对旋转冲压转子进气道背压脉动时压缩进气道的内部流场进行了数值仿真,分析了背压脉动时不同脉动频率、不同脉动幅值条件下旋转冲压转子进气道流场的激励特性及性能变化。研究结果表明,背压脉动对旋转冲压转子进气道流场的激励特性及性能具有显著的影响。旋转冲压转子进气道流场激励的非线性特征随着背压脉动频率的增加而增强,却随着背压脉动幅值的增加而减弱。旋转冲压转子进气道性能的稳定性随着背压脉动频率和幅值的减小而增强。
In order to obtain the variation of excitation characteristics and performance of inlet flow field of rotating ram rotor under external excitation, the numerical simulation of the internal flow field of the compressed inlet in the back pressure pulsation of rotating ram rotor was carried out. Excitation characteristics and performance changes of inlet flow field of rotating ram rotor under different pulsation frequencies and different pulsation amplitudes. The results show that the back pressure pulsation has a significant effect on the excitation characteristics and performance of the rotor inlet flow field. The nonlinear characteristics of the flow field in the rotating ram rotor inlet enhance with the increase of back pressure pulsation frequency, but decrease with the increase of back pressure pulsation amplitude. Rotating ram rotor inlet stability increases with decreasing backpressure pulsation frequency and amplitude.