Experimental and Numerical Analysis of Turbulent Opposed Impinging Jets

Abstract

A fundamental study of two turbulent, directly opposed impinging jets in a stagnant ambient fluid, unconfined or uninfluenced by far-field walls, is presented. By experimental investigation and numerical modeling the fundamental characteristics of direct impingement of two turbulent axisymmetric round jets under seven different geometrical and flow-rate configurations (L * = L/d = {5, 10, 20}, where L is nozzle to nozzle separation distance and d is nozzle diameter, and Re = ρU 0 d/μ = {1500, 4500, 7500, 11000}, where ρ is fluid density, μ is dynamic viscosity of fluid, and U 0 is average initial velocity of fluid) are discussed. Flow visualization and velocity measurements performed using various laser-based techniques have revealed the effects of Reynolds number Re and dimensionless nozzle to nozzle separation L * on the complex flow structure. Similarity analysis of the initial freejet development and developing radial jet found Re = 11 x 10 3 and L * = 20 as the only case where the freejets exhibit a self-preserving development