基于真实细观结构的多级配AP/HTPB复合推进剂燃烧数值模拟

To predict the combustion characteristics of composite propellants in the absence of complete ini⁃ tial information，micro-CT technology was employed to obtain detailed 3D microstructural features and AP parti⁃ cle size distribution. A gas-solid coupled combustion model was established，and numerical simulations were conducted on representative two-dimensional slices. The result indicates significant variations in gas-phase tem⁃ perature distribution and burning rate at the same burning surface among different slices，with the maximum dif⁃ ference in temperature distortion index reaching 18.5% and the maximum difference in burning rate reaching 25.6% when the burning surface is located at y=0 μm. However，the average burning rate among different slices varied only by 0.07 cm/s. The average burning rate calculated using the random packing model differed from that obtained using micro-CT by no more than 1%，but micro-CT can effectively address the challenge of obtaining accurate AP particle size distribution information in random packing algorithms. This study combines high-preci⁃ sion measurement technology with numerical simulation，providing a novel approach for investigating the micro-combustion behavior of propellants.