Micro-PIV技术--粒子图像测速技术的新进展

Micro-PIV是近年来发展起来的一种微尺度流动测速技术.它是传统PIV测量与光学显微技术相结合的一种整场、瞬态、定量测量方法, 其基本测速原理与传统PIV相同, 但在示踪粒子选择、图像获取和处理等方面两者存在较大差别.Micro-PIV突破了传统微尺度流体力学测量手段的局限性, 使得对微尺度流动元件的研究从过去只能给出流量、阻力特性等有限信息逐步转向对全流场内流结构的直接测量上, 并且达到了相当高的分辨率和测量精度.本文对近几年Micro-PIV技术发展状况进行了总结和分析, 论述了Micro-PIV技术与传统PIV的主要区别以及具体的处理技术, 反映了其在科学与工程中的应用,并对此项技术的发展作了展望. 

MICRO-PIV: A NEW DEVELOPMENT OF PARTICLE IMAGE VELOCIMETRY

Micro-PIV is a new technique for measuring the velocity fieldof a micro-scale flow in recent years. It is a kind of full field,instantaneous and quantitative measurement method that combines traditionalPIV with microscopic technology. Comparing with the traditional PIV, thebasic principle is the same, but it is remarkably different in seedingselection, image acquisition and processing. Micro-PIV breaks through thelimitation of the traditional measurement methods employed in micro-scalefluid mechanics, and extends the studies based on some limitedinformation aboutflow rate and friction characters to the flow structure of the wholefielddirectly with high resolution and precision. In the presentarticle, the development of Micro-PIV in recent years is summarized andanalysed, its differences from the traditional PIV and the processingtechnologies are discussed, the Micro-PIV application in science andengineering is reviewed and its progress is forecasted.