关键词:

波瓣, 引射器, 数值模拟, 热混合效率

Abstract: In this paper, a numerical procedure to study the mixing flow in a circularly lobed nozzle is presented.The predictions are obtained by using SIMPLEC and complete pressure corrections algorithm to solve the incompressible Navier-Stokes equations.Turbulence is characterized by the standard k-ε eddy viscosity model.To fit the irregular boundaries of the flow field,curvilinear greatly nonorthogonal coordinates are used.The robustness of the computational procedure is enhanced by making use of nonstaggered grids. Results show that the thermal mixing efficiency of primary and secondary flow varies with the axial length of the mixer, and the streamwise vortex development.In the whole, the thermal mixing efficiency is not high, and the maximum value is 0.874.Good agreement between the numerical and experimental results is obtained for the axial velocity and temperature profiles in the outer section of the mixer, and the pressure coefficient on the wall of the mixer along the axial line.

Key words:

波瓣, 引射器, 数值模拟, 热混合效率