【摘要】 采用角区端壁射流控制某进口马赫数为Ma=0.67的高速平面扩压叶栅流动分离。研究了射流轴向位置和角度对叶栅气动性能的影响,结果表明:通过对角区内注入能量可有效减弱流道后部的流动分离,仅采用相当于主流流量0.6%的射流气体,可使得叶栅出口总压损失系数降低10.0%。位于角区内分离起始位置处的射流控制效果最佳;随着角度的增加,射流与来流间的冲击和掺混损失增大,近叶展中部的分离流动加剧,使得流动控制效果减弱。更多还原

【Abstract】 A numerical investigation of separation control by using corner endwall jet is conducted for a high speed linear compressor cascade with an inlet Mach number of Ma=0.67. The influence of the jet parameters including the location and the direction are discussed in detail. The results show that the injection of energy into the corner can weaken the boundary layer separation on the suction surface effectively. With a tiny jet-to-mainstream mass flow ratio of 0.6%,a maximum loss reduction of 10.0% relative to the baseline case is obtained. The optimal jet location is the starting point of the separation line. With the increase of jet angle, the impact losses between the jet and main flow and the mixing effects are strengthened, thus enhancing the flow separation in the mid-span region and reducing the benefits of jet on the cascade performance.更多还原