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提出了一种叶尖逆向涡流发生器减小叶尖泄漏流的方法,利用压力面和叶顶面的压力差,将气流从压力面引入,从叶顶面逆着叶尖泄漏流方向高速射出减小叶尖泄漏流.对某典型毫米尺度涡轮叶栅进行了有/无逆向涡流发生器流场的数值对比分析,分析了不同进口条件下逆向涡流发生器对叶尖泄漏流和周向载荷的影响.结果发现:在典型进口条件下,逆向涡流发生器使得叶尖间隙泄漏流量降低了3.3%,周向载荷升高了6.2%;进口马赫数越小,涡流器对泄漏流量的减小效果越好;而进口马赫数越大,涡流器对叶片周向载荷的提高越明显.进口马赫数增大,该方法对涡轮效率的提高越大.
A tip-tip vortex generator is proposed to reduce the tip leakage flow. The pressure difference between the pressure surface and the top of the blade is used to introduce the air flow from the pressure surface and to eject it at a high velocity against the tip leakage flow The tip leakage flow is reduced.The numerical comparison of the flow field with / without reverse vortex generator in a typical millimeter-scale turbine cascade is carried out. The influence of reverse vortex generator on tip leakage flow and circumferential load under different inlet conditions The results show that under typical inlet conditions, the reverse vortex generator reduces the tip clearance leakage flow by 3.3% and the circumferential load by 6.2%. The smaller the inlet Mach number, the smaller the turbulence of leakage flow The better the effect is.The larger the inlet Mach number, the more obvious the vortex finder improves the circumferential load of the blade.The larger the inlet Mach number, the greater the efficiency of the turbine is.