两相环境下EPDM绝热层多因素耦合烧蚀预估

In order to make sure that the engine can operate in harsh environments, in the design of the insulator, the thickness of the insulator will directly affect the stability of the engine structure, so the ablation prediction of the insulator is very important for the reasonable design of the insulator. For solving the engineering prediction of the ablation performance of the solid rocket motors ethylene propylene diene monomer (EPDM) insulator, this paper combines the environmental characteristics of the two-phase flow in the solid rocket engine, using the three-equations thermochemical ablation model and the dual control mechanism of the diffusion chemical dynamics as the basic mathematical model. Based on the coupled parameters of the surface porosity of the carbonized layer and considering the erosion effects of air flow and particles, the control equation of the multi-factor ablation model of the insulator was established. By implicitly solving the governing equations and comprehensively analyzing the temperature distribution of the insulator and the positions of the ablation line, the carbonization line, and the pyrolysis line, the theoretical carbonization ablation rate of the EPDM insulator in a two-phase flow environment is obtained. Compared with the measured results, the obtained ablation rate has an error less than 10%, indicating that the ablation prediction method put forward in this paper can be used for EPDM insulator ablation engineering analysis.