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激光多普勒测速技术(LDA),是一种流体速度的无接触式光学测量方法。本文阐述了这种方法的原理和采用“反射式后向”接收光路在光机参数的计算与选取上的特殊问题,介绍了用这种独特的光路对某种几何壳体内部流场的测量工作。测量结果与数值计算相近,与流场显示所得流谱也基本吻合。
Laser Doppler Velocimetry (LDA) is a non-contact optical measurement of fluid velocity. This paper describes the principle of this method and the special problem of calculating and choosing the parameters of the light machine using the “reflective backward” receiving optical path. The measurement of the flow field inside a geometric shell with this unique optical path is introduced jobs. The measurement results are similar to the numerical calculation, which are basically consistent with the flow patterns obtained from the flow field display.