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8154941 
Journal Article 
Numerical Simulation of AP/HTPB Microscale Stable Combustion under Subatmospheric Pressure 
Zhao, JF; Yu, YG 
2021 
44 
1 
78-84 
Chinese 
To study the combustion characteristics of ammonium perchlorate/hydroxyl-terminated polybutadiene (AP/HTPB) at subatmospheric pressure, a two-dimensional sandwich model was established by using a three-step reaction kinetics mechanism, coupled with gas-solid phases. The AP/HTPB micro-combustion was simulated at 20-80kPa, and compared with the combustion characteristics of AP/HTPB at high pressure of 4MPa. The results show that the first step reaction in the BDP model is close to the burning surface under subatmospheric pressure, and it has a high heat release, which plays a dominant role in the combustion process of AP/HTPB propellant. Different pressure in the combustion process leads to distinct flame characteristics. Diffusion and mixing processes coexist in the flame under subatmospheric pressure, but only diffusion flame under high pressure. Compared to the high pressure condition, flame under the subatmospheric pressure is far from the burning surface and has a large area. The temperature distribution of gas-solid phases is distinct due to the difference of heat transfer area and heat release rate at high and low pressures, thus affecting the shape of the burning surface. The junction of AP and HTPB under subatmospheric pressure is prominent relative to the whole burning surface, while the junction under high pressure is depressed relative to the whole burning surface. © 2021, Editorial Board of Journal of Explosives & Propellants. All right reserved. 
Ammonium perchlorate/hydroxyl-terminated polybutadiene (AP/HTPB); Microscale combustion; Numerical simulation; Physical chemistry; Subatmospheric pressure