简述了激光多普勒测速及流场显示原理；
The principle of Laser Doppler Velocimetry and the method of showing the fluid field are briefly introduced.
流场显示以PIV技术为主，辅以染料示踪技术。
The PIV technique and auxiliary dye-tracer technique are used to display the flow field.
采用流场显示的方法研究了旋转U型通道内的流场。
The flow through a rotating U bend duct is investigated by means of visualization.
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