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对5°冲角下分别具有吸力面合成射流激励和端壁合成射流激励的压气机叶栅内流场进行了详细的数值模拟。结果表明:合理施加的合成射流吸力面激励和端壁激励均推迟了分离的出现,使分离点都向下游流方向有所偏移,同时有效增强了分离区内外的掺混,使旋涡强度减弱,损失降低,明显改善了栅内的流动状况;合成射流的非定常扰动特性有效抑制了出口端壁角区内的速度波动;不同激励型式、激励位置和激励强度(激励范围)对作用效果有较大影响,端壁圆孔激励因激励范围较小,对叶栅内流动状况改善不明显。
The numerical simulation of the flow field inside the compressor cascade with the suction side synthetic jet excitation and the end wall synthetic jet excitation at 5 ° angle of attack was carried out in detail. The results show that both the suction side excitation and the end wall excitation of the synthetic jet delayed the separation, and the separation points are shifted to the downstream flow direction, meanwhile, the mixing inside and outside the separation zone is effectively enhanced and the vortex strength is weakened , The loss is reduced and the flow condition in the grid is obviously improved. The unsteady perturbation of the synthetic jet effectively suppresses the velocity fluctuation in the angular region of the exit end. The effects of different excitation types, excitation positions and excitation intensity (excitation range) A greater impact, the end wall of the circular hole excitation due to the incentive range is small, the flow inside the cascade to improve the situation is not obvious.