Study on conjugate heat transfer characteristics of flexible structure of solid motor nozzle based on multiple working conditions

In order to study the influence of the deformations of the nozzle's flexible sections on its inner wall's heat transfer, this research uses the two- dimensional axisymmetric model and the k.. SST turbulence model to numerically analyze the tail flow field of the flexibleextendible nozzle under multiple working conditions. The flow field and the inner wall's heat transfer of the flexible sections with and without deformations are simulated and analyzed. The simulation results show that when the flexible sections are deformed, new shock waves will be generated in the tail flow field of the nozzle; the temperature and the heat flux of the first half of each flexible section decrease, while those at the end of each flexible section increase, and the deformations' effect on temperature and heat flux diminishes over time. The research shows that the deformations of the flexible sections will make the inner wall's heat transfer of the flexible sections uneven, and the inner wall's ablation at the end of each flexible section may be aggravated, while that of the front half may be alleviated.