用三维激光多普勒测速技术测量了扩压叶栅出口近端壁区域的流动结构和紊流特性。实验结果表明，气流流出扩压叶栅出口后，吸力面和压力面的通道涡将在较长的距离内保持其形态和强度，但是尾迹的形成及尾迹在压力的作用下向吸力面方向的偏斜成为了这一阶段的主要流动现象。通道涡、尾迹和尾迹的运动对紊流量的分布规律具有决定性的影响。随着流体向下游运动，尾迹区内雷诺正应力分量的衰减和扩散均比雷诺切应力快。而通道涡区域紊流量的值则变化不大。
An experimental study of flow in the wake region adjacent to the endwall of a linear compressor cascade is presented. The measurements were carried out in the large-scale wind tunnel at low speed of 9 m/s. Presented data consists of profiles of mean velocity and Reynolds' stresses.Data show that the passage vortex will keep on its form and intensity in a long distance. Vorticity and Reynolds' stresses distributions in the wake region are highly dependent on the wake and its motion due to the trailing edge pressure recovery. With the movement to downstream, the decreasing and diffusing of Reynolds' normal stresses is larger than that of Reynolds' shear stresses.
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