三维激光多普勒测速技术测量了扩压叶栅叶片和端壁相交的角区中的流动结构和紊流特性。实验结果表明，角区中端壁附面层和叶面附面层的堆积使得叶面附面层变厚；角区内存在较强的通道涡，随流动向下游发展，通道涡核心远离叶面；在前缘产生的马蹄涡逐步消失；通道涡使得角区的紊流动能增加，并影响雷诺正应力的分布。 Three-dimensional laser Doppler velocimetry was used to measure the flow structure and turbulent flow in the corner area where the diffuser cascade vanes intersect the endwall. The experimental results show that the deposition of the lamina of end wall and foliar lamina in the corner area makes the lamina of the lamina to thicken. There is a strong passage vortex in the corner area, which develops with the flow to the downstream. Surface; the horseshoe vortex at the leading edge gradually disappears; the passage vortex increases the turbulent kinetic energy in the corner area and affects the distribution of Reynolds stress.