关键词: 喷管;引射器+;混合机;数值计算

Abstract: A research on the analytical prediction of pumping performance for the lobed mixer-ejector was performed by way of CFD technique. In the computation, the inlet of the primary flow used the velocity boundary condition. The total pressure boundary condition was applied to the inlet of the second flow and the static pressure boundary condition was applied to the outlet of the mixing flow, both were defined as ambient pressure. Compared with the experimental data, it is indicated that the relative error between the computational and experimental results is about 10%. A series of computations are conducted to obtain the effects of mixing-duct parameters on pumping-mixing performance and reveal further mechanism of the lobed nozzle on pumping-mixing enhancement, which shows that there exists a relative low static pressure region corresponding to the lobe valley at lobe nozzle exit and there is an optimum performance design for the particular mixer-ejector system. These results are verified with the physics nature.

Key words: Nozzle;Ejector~+;Mixer;Numerical calculation