Abstract

A numerical simulation was carried out to compute the penetration, mixing and turbulence structures of a jet injected perpendicular into a free stream through different circular nozzles. Six cases were studied, including 3 different jet diameters and 2 different blowing ratios. The formation of the Counter rotating Vortex Pair (CVP) and the interaction between the free stream and jet flow is discussed. The d, rd and r 2 d scaling parameters associated with the centerline jet trajectory shows bifurcation into two separate branches. The bifurcation was related to the different Reynolds numbers. Flow features related to mixing, centerline velocity decay, size and shape of the recirculation bubble formed behind the jet are discussed. Higher blowing ratios show higher velocity decay rate. Both time averaged flow field and turbulence are compared with 2D Particle Image Velocimetry (PIV) data taken along the jet center plane. Good match between the experiments and computation was observed.

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