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在进口马赫数Ma=0.67的高速平面扩压叶栅端壁采用射流旋涡发生器以控制其二次流动。数值模拟结果表明:射流旋涡可有效抑制端壁附面层横向迁移,增强端区与主流间的流体掺混,从而显著减弱角区低能流体堆积,推迟吸力面侧流动分离,减少栅内损失,增强气流折转能力。随着来流冲角的增加,栅内损失减小越明显,当i=4°,仅采用相当于叶栅进口流量0.2%的射流量,即可使得总压损失减小高达13%。
The inlet vortex vortex generator is used to control the secondary flow at the inlet end of the high-speed planar diffuser cascade with Ma = 0.67. The numerical simulation results show that the jet vortex can effectively inhibit lateral migration of the boundary layer of the end wall and enhance the fluid mixing between the end zone and the main stream, thereby significantly reducing the accumulation of low-energy fluid in the corner zone, delaying the flow separation on the suction side and reducing the grid loss, Enhance airflow folding ability. With the increase of inflow angle, the more obvious the loss decreases. When i = 4 °, the total pressure loss can be reduced by up to 13% using only the jet flow equivalent to 0.2% of the inlet flow rate of the cascade.