Simulation Analysis of the Internal Flow Characteristics for SRM with Tail-pipe Nozzle
In order to analyze the internal flow characteristics of SRM with tail-pipe nozzle,a differential interior ballistic pro-gram is developed to solve the interior ballistic of the motor,and meanwhile the mass inlet condition established by using the custom function,the combustion surface displacement simulated by a dynamic grid technique,and the Euler-Lagrange model combined with the particle random walk model are used to conduct a contrastive study on the three-dimensional two-phase tran-sient internal flow field of SRM with tail-pipe and no tail-pipe. The study compares performance of the SRMs and analyzes in-fluence of the tail-pipe nozzle on gas phase flow characteristics and motion distribution of particles with different diameters. The results show that:the tail-pipe nozzle can cause frictional drag,and its internal equilibrium pressure is higher than that of the motor without tail-pipe nozzle,which leads to acceleration of the charge combusting and decrease of the output thrust;Flow ve-locity of the gas flowing through the tail-pipe area increases obviously,but the particle action will cause oscillation of the flow velocity and temperature near the axis,and the change of temperature is small,so the thermal protection in the area should be considered. Because of inertia,particles converge first and then diverge in tail-pipe area,with the increase of particle size,the particle convergence area goes further forward,the degree of dispersion is greater,and the effect of turbulence on particle mo-tion is smaller.
万方数据
维普
