Cinematic Particle Image Velocimetry of High-Reynolds-Number Turbulent Free Shear Layer

摘要

The objective of this research was to study the time-evolving velocity field in a two-stream, turbulent, planar free shear layer using a cinematic particle image velocimetry technique. The water shear layer had a velocity ratio of 0.23 and a Reynolds number of 2.62x10~4 based on velocity thickness and velocity difference. The cinematic particle im- age velocimetry system employed an argon-ion laser, a scanning mirror, and a 35-mm movie camera. Experimental data obtained by this technique yielded a combined spatial and temporal evolution of the two-dimensional velocity and spanwise vorticity fields. (The resulting set of 400 velocity vector fields is available by contacting the second author).