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应用二维激光多普勒仪测量了二元曲壁非对称扩张通道内的湍流附面层分离流动。得到了时均速度、雷诺应力、平均流动方向角及正反向间歇流动因子的分布。文中给出了所测结果的不确定度,并在激光测速的近壁测量上做了尝试。实验结果分析表明:间歇瞬时分离点对应于附面层内垂直压强梯度的最大值;Schofield的速度尺度和长度尺度可用于形成新的速度相似型;正反向间歇流动因子γpuo与平均流动方向角存在着简单的线性关系。
The two-dimensional laser Doppler technique was used to measure the turbulent separation flow in the asymmetric dilation channel of a binary curved wall. The average velocity, Reynolds stress, average flow direction angle and the distribution of forward and reverse intermittent flow factors were obtained. The uncertainty of the measured result is given in the paper, and an attempt is made on the near wall measurement of laser speed measurement. The experimental results show that the intermittent instantaneous separation point corresponds to the maximum of the vertical pressure gradient in the coating; the velocity scale and the length scale of Schofield can be used to form a new velocity similarity type; the positive and negative intermittent flow factors γpuo and the average flow direction angle There is a simple linear relationship.