Thermal/Mechanical Erosion Simulation of Supersonic High-Temperature Jet Impinging on Thermal Protection Material

Abstract

In this study computational fluid dynamics (CFD) coupled with thermal erosion model is used to simulate the thermal erosion process of supersonic jet impinging on thermal protection material with aims to develop the suitable user defined function (UDF) for thermal boundary condition in Thermal Protection Material (TPM) ablation problem The preliminary ablation physical model assumes that the thermal protection material is ablated by phase change latent heat due to melting processes and the boundary condition on the impinge surface is initially assumed as the isothermal wall condition at material melting point (ex the copper melting point temperature 1358K) and calculate the heat flux of the supersonic jet on the impinging surface The heat flux on the surface is used to calculate the ablation thickness of the impinge surface under the latent heat phase change In addition to isothermal wall condition in order to get closer to the real situation This study considers that the initial condition of the impinge surface is at room temperature and uses the one-dimensional and one-dimensional/two-dimensional transient heat transfer to calculate the rise of the impinge surface temperature When the impinge surface reaches the melting point phase change ablation will be performed Finally the actual solid-propellant rocket alumina particles (about 16% of the plume) is considered in the present CFD model The results show the thermal loading effects of particles on the impinge surface is very significant If the particle effects is ignored the wall heat flux is one order of magnitude less than the results with the particle thermal loading consideration Therefore high temperature particles will affect the impinge surface when the particles are taken into account In addition to the thermal erosion effects there are also the mechanical erosion effects on the impinging surface Therefore this study will also evaluate and analyze the ablation/erosion of the impinging surface in the two-phase flow

Date of Award	2020
Original language	English
Supervisor	Tzong-Shyng Leu (Supervisor)