NUMERICAL PREDICTION OF WALL SHEAR RATE IN IMPINGING CROSS-SHAPED JET AT MODERATE REYNOLDS NUMBER

摘要

A Computational Fluid Dynamics investigation of impinging lobed jet issuing from a cruciform orifice nozzle was conducted at moderate Reynolds number of 5290, based on the equivalent diameter of the nozzle (De=7.64 mm) and the streamwise bulk velocity (U_0=0.72 m/s). The wall shear rate obtained from numerical simulation is compared to the one acquired experimentally using electro-diffusion technique [1]. The best results were obtained by k-ω based turbulence models. The model with the best accuracy for the present work was k-ω SST, which was the only model that has managed to capture the inflection point on the radial distribution of wall shear rate.