Numerical simulations on the flow fields downstream chevron nozzles

Several chevron nozzles were numerical simulated. The vortex structure, entrainment ratio and thrust loss were analyzed. The QUICK and finite volume method, standard k-ε turbulence model, wall functions were employed to solve the N-S equations. The result shows that increasing chevron bend angle can enhance the fine-scale mixing, improve the initial axial velocity decay rate and increase the strength and the scale of the streamwise vortices and the slantwise vortices. When the bend angle increases by 1°, the block ratio is improved by 0.98%, the thrust loss is raised by 1.71% and the thrust-per-mass-flux is improved by 3.45%.