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数值研究了合成射流控制高负荷压气机叶栅非定常流动分离的效果及机理。结果表明,激励频率、幅值是影响合成射流控制效果的重要参数,当激励频率为最优值、幅值大于某一阈值时,叶栅时均总压损失系数最大降低40.3%,静压升系数提高12.1%。合成射流的动量注入显著增大了激励缝下游流场的湍流剪切应力,使得剪切层内的速度脉动增强,在宏观上表现为近壁区域与主流流体间的动量交换得到加强,这是非定常流动分离得到抑制的主要原因。
The effect and mechanism of synthetic jet control unsteady flow separation on high load compressor cascades were studied numerically. The results show that the excitation frequency and amplitude are important parameters that affect the control effect of synthetic jet. When the excitation frequency is the optimal value and the amplitude is greater than a certain threshold, the maximum total pressure loss coefficient decreases by 40.3% Factor increased by 12.1%. The momentum injection of the synthetic jet significantly increases the turbulent shear stress in the flow field downstream of the excitation slit, resulting in an increase of the velocity pulsation in the shear layer, which is macroscopically enhanced by the momentum exchange between the near-wall region and the main fluid The main reason for the suppression of constant flow separation.