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数值模拟了低雷诺数下跨声速压气机设计转速下内部流场特性.结果表明:在压气机流场内部存在从叶根向叶顶运动的附面层径向涡流,它由叶根附面层转捩区内的分离气流引发,从叶根向叶顶发展,并在叶顶聚集.随着雷诺数下降,该附面层径向涡的作用范围不断增大,在叶顶形成大面积分离区,在激波和间隙泄漏流诱发的阻塞尚未充分发展起来之前,该分离区产生的通道阻塞起主导作用,成为低雷诺数条件下影响压气机流动失稳的关键因素.
The numerical simulation of internal flow field at transonic compressor design speed under low Reynolds number shows that there is a radial vortex in the flow field of the compressor which moves from the root to the tip of the blade, The turbulent flow in the zone turned to flow from the root to the tip of the leaf and gathered at the tip of the leaf.With the decrease of Reynolds number, Separation zone, before the blockage caused by shock wave and interstitial leakage flow has not been fully developed, the channel blockage in this separation zone plays a leading role and becomes the key factor that affects the flow instability of compressor under low Reynolds number conditions.