Simulation study on ablation of insulation layer of solid propellant ramjet under multi-factor coupling
Based on the classical three-layer one-side ablation model of silicon-based materials,a comprehensive ablation model of insulation layer under the coupling effect of various factors is established by introducing the expansion coefficient,calculating the partition of solid and porous media,and using the numerical treatment method of temperature coupling at the boundary.The relative error between the calculated results of the model and the experimental results of the literature fluctuates between-9.29％and 9.75％,indicating that the model has a high accuracy.With reference to the experimental parameters,the material ablation is numerically calculated in condensing phase environment and oxygen rich environment,and the changing laws of the insulation layer temperature,porosity,mass ablation rate and line ablation rate are explored.Temperature,pressure,gas velocity,particle concentration,oxygen enrichment and other environmental parameters are used as variables for numerical calculation,and the results can provide some reference for the ablation prediction of insulation layer of solid propellant ramjet.
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