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采用大涡模拟,利用动网格技术,通过求解三维非定常雷诺时均Navier-Stokes方程,对零质量合成射流进行了数值模拟。研究的合成射流最大速度为6.5m/s,激励频率为80Hz。结果表明:吹气过程,振动薄膜向前运动气流在射流出口形成剪切层,剪切层向外卷起形成涡环;在吸气过程,振动薄膜向后运动,涡环继续向下游运动,射流出口处的气流被吸入腔体;射流出口处速度呈正弦分布。合成射流可以有效抑制叶栅吸力面的流动分离,控制后分离区域由原来的28.60%轴向弦长(Cax)减少到了17.23%Cax。合成射流的各个过程都可以抑制流动分离,但吹吸气交替过程以及吸气过程的控制效果有所减弱。
By using large eddy simulation and moving mesh technique, the zero-mass synthetic jet is numerically simulated by solving the three-dimensional unsteady Reynolds-averaged Navier-Stokes equations. The maximum velocity of the synthetic jet studied was 6.5 m / s and the excitation frequency was 80 Hz. The results show that in the blowing process, the forward moving air flow of the vibrating membrane forms a shear layer at the jet outlet, and the shear layer winds upwards to form a vortex ring. During the air suction process, the vibrating membrane moves backward and the vortex ring continues to move downstream, Airflow at the exit of the jet is drawn into the cavity; the velocity at the exit of the jet is sinusoidally distributed. The synthetic jet can effectively restrain the flow separation on the suction side of the cascade, and the area after the control is reduced from the original 28.60% axial chord (Cax) to 17.23% Cax. The synthetic jets can inhibit the flow of each process separation, but the process of blowing air suction and suction process control effect weakened.