基于激光多普勒测速的流场测试技术

激光多普勒测速技术,作为一种非接触式测速技术,具有测速精度高,测速范围广,空间分辨率高,不影响流场分布、可测远距离速度场等优点。因此多普勒测速技术已经在众多领域中得到广泛的应用。本文主要从理论上对激光多普勒测速技术进行分析,从实验角度阐述了激光多普勒测速技术的工作机理。并对激光多普勒测速技术在内燃机中流场测试应用的可行性进行分析,最后介绍了多普勒测速技术在内燃机流场测试中的应用和国内外发展情况。

Technique of flow field measurement based on laser Doppler velocimetry

The laser Doppler technique is a kind of non-contact velocimetry,which has many advantages,such as high precision,wide speed range,high spatial resolution.It does not affect the flow field and can be used in measuring long-range velocity field.Therefore,Doppler velocimetry has been used widely in many fields.This article gives a theoretical analysis of laser Doppler velocimetry,and introduces the working mechanism.We also give an analysis of the feasibility of applying the laser Doppler velocimetry to flow field in internal combustion engine.Finally we introduce the domestic and international developments of Doppler velocimetry of flow field in internal combustion engine.