| The exhausted-gas impinges on the plate of the plenum in Vertical Launching System(VLS) after the missile is ignited, and a strong impinging jet is formed. The exhausted-gas is often assumed as pure gas in numerical computation of the impinging jet, but Al2O3 particles occupy considerable proportion in the flow of the exhausted-gas, the numerical solution may deviate from fact with influence of particle discrete phase. The strong erosion action of the particles is a main factor to cause the ablative of the erosion-resisting material on the plate, it is necessary to get to know particles erosion action to the bottom.With the standard k -εmodel, Lagrange particle trajectory model and PSIC two phase coupling algorithm, the single and gas-particle two phase flow field of the impinging jet formed by the exhausted-gas impinging on the plate vertically are solved in some cases in present paper, including the nozzle exit pressure ratio is 1.5, 2.0, 2.5 with the 3, 4 and 6 times distance between the plate and nozzle exit. The structural characteristics in the different cases and the structure differences between single and two phase flow are analyzed in details.Also, erosion rate of the plate caused by particles is calculated with Particle Erosion and Accretion Module provided by FLUENT6.2. The relationship between the distribution of erosion rate, flow structure of impinging jets, distribution of particles in flow field and particle trajectories are calculated and analyzed. The calculation result is in good agreement with that of the experiment.
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