AN EXPERIMENTAL STUDY ON DUAL-JET FLOW WITH PIV METHOD

摘要

Dual-jet is a new kind of high efficient jet, which is formed by combining a circular swirl jet with a round straight jet. This paper presents experimental results of the dual-jet flow using cross-correlation Particle Image Velocimetry. The time average velocity data and the vorticity data are experimentally acquired to analysis the attenuation of jet velocity. The results clearly demonstrate that the swirl jet determines the dual-jet hydrodynamic characteristics at short jet distance, and the round jet dominant the dual-jet at long jet distance. The swirl jet is attracted to the round jet, which prevents the formation of hole bottom convex and enlarges penetration depth.