近失速状态下压气机静子通道内的三维流动

THREE-DIMENSIONAL FLOW STRUCTURES IN STATOR PASSAGE OF AN AXIAL COMPRESSOR AT THE NEAR-STALL CONDITION

本文综合运用体式激光粒子图像测速技术和油流显示技术研究了近失速状态下压气机静子通道内部的复杂三维流动,建立了静叶通道内部三维流动结构模型,并分析了典型流动结构的产生、发展和演化机制。实验结果表明,在近失速状态,近叶通道出现了两个截然不同的分离区—吸力面近机匣角区分离(7%～50%弦长,闭式分离)和吸力面近轮毂角区分离(50%弦长以后,开式分离),以及一些复杂的流向旋涡流动结构。

Three-dimensional flow structures inside the stator passage of the low-speed axial compressor test were investigated, by using SPIV and oil flow visualization techniques, at both the design and near-stall conditions. The measured results at the near-stall condition are analyzed and show that both the tip separation and corner stall exist in the stator passage. The tip separation is a close separation, while the hub-stall is an open one. Inside the stator passage, the secondary flows are dominated by five streamwise vortices, which can be realized from the SPIV data and the oil flow pictures.