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采用非定常数值模拟的方法研究了设计工况下对转压气机内部的非定常流动机理,着重分析对转压气机内部两排转子之间动/动干涉效应对叶片非定常负荷的影响。研究表明:对转环境下,下游转子的势流干扰造成上游转子压力面的强非定常性,而在上游转子尾迹和势流干扰的影响下,下游转子叶片前缘非定常性极强,相比叶片其他区域非定常强度不是很高,并且从频谱分析的角度证实了两排转子之间的相互影响,反向旋转造成叶片表面压力脉动频率加倍;分析两排转子叶片表面的气动力可知,下游转子的势流干扰对上游转子造成的影响略微强于上游尾迹和势流对下游转子的影响,并且两排转子之间的相对位置对叶片所受非定常气动力存在一定的影响。
Unsteady numerical simulation method is used to study the unsteady flow mechanism inside the compressor during the design condition. The influence of the dynamic / dynamic interference between the two rows of rotors on the unsteady load on the rotor is emphatically analyzed. The results show that the upstream rotor’s pressure surface is strongly unsteady due to the disturbance of the potential flow of the rotor downstream to the rotating environment. However, under the influence of the upstream rotor wake and the disturbance of the potential flow, the leading edge of the downstream rotor blade is highly unsteady, The unsteady strength of the blade is not very high, and the interaction between the two rows of rotors is confirmed from the spectrum analysis. The reverse rotation causes double the frequency of the pressure pulsation on the blade surface. By analyzing the aerodynamic forces of the two rows of rotor blades, The effect of downstream rotor flow disturbance on the upstream rotor is slightly stronger than that of upstream wake and potential flow on the downstream rotor. The relative position between the two rows of rotor affects the unsteady aerodynamic forces on the blade.