运用不可压缩流动NavierStokes方程,对波瓣喷管引射混合器的流场和引射特性进行了三维数值研究。在计算过程中,主流进口采用质量流量边界条件,二次流进口和混合流出口采用压力边界条件,均设置为环境大气压力。与相关的实验结果对比表明本文的计算方法可以有效地预测引射流量比和混合流场。针对混合管的结构参数开展了系列研究,获得了混合管截面比和长径比对于引射系数和热混合效率的影响趋势。 Using the incompressible flow NavierStokes equation, the three-dimensional numerical simulation of the flow field and the emanation characteristic of the lobed nozzle ejector was carried out. In the calculation process, the mainstream inlet adopts the mass flow boundary conditions, the secondary flow inlet and the mixed flow outlet adopt the pressure boundary conditions, and both are set as the ambient atmospheric pressure. Compared with the related experimental results, the calculation method in this paper can predict the jet flow ratio and the mixed flow field effectively. Aiming at the structural parameters of the mixing tube, a series of studies were carried out, and the influence of the ratio of the aspect ratio and the aspect ratio of the mixing tube on the emissivity and the thermal mixing efficiency was obtained.