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对扩压器内单喷口射流产生的流向涡控制扩压器内部边界层分离流动行为进行了研究。研究的对象是一个扩张角为10°的二维扩压器,扩压器进出口面积比为1∶4.7,入口高度为15 mm。采用数值计算方法研究了当射流出口速度为非稳态时对分离流动的影响。给出了不同时刻,不同截面上的旋涡涡量分布。结果表明,采用非稳态喷射流向涡方法可以在不改变主流流量特性的情况下,有效地减小分离流动区域。
The separation flow behavior of the diffuser internal boundary layer was studied by the flow vortex generated by the single jet nozzle in the diffuser. The object of study was a two-dimensional diffuser with an expansion angle of 10 °, with a diffuser inlet-outlet area ratio of 1: 4.7 and an inlet height of 15 mm. The numerical calculation method is used to study the influence on the separation flow when the jet exit velocity is unsteady. The vorticity distribution of vortex at different time and different cross section is given. The results show that the unsteady jet flow vortex method can effectively reduce the separation flow area without changing the mainstream flow characteristics.