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本文介绍一种粒子图象电影测速技术,该技术采用机械调制装置及光学透镜,将连续输出的氩离子激光调制成周期性脉冲片光源序列,并与快速照相枪匹配,可以连续拍摄流场一个截面上随时间发展过程中不同瞬态的一系列两次或多次曝光的粒子图象底片,因而不仅可以取得流动一个截面上的瞬时二维速度场,并且可以获得该流动截面速度场发展的时间历程,为定量研究非定常流动随时间的发展特性提供了一种有效途径。
This paper introduces a particle image film velocimetry technology, the use of mechanical modulation device and optical lens, the continuous output of argon ion laser modulated into a periodic pulse light source sequence, and the fast camera match, you can continuously capture a flow field A series of two or more exposures of the particle image film with different transients over time can be obtained not only for the instantaneous two-dimensional velocity field flowing in one cross-section, but also for the development of the velocity field in the cross-section The time history provides an effective way to quantitatively study the development characteristics of unsteady flow over time.