喷注方式和骨架结构对骨架增强石蜡燃料燃烧影响的数值分析

To address the combustion problem of polymer skeleton-reinforced paraffin fuel in hybrid rocket motors，CFD software was used to carry out numerical simulation of the combustion process of helical and hexagonal skeleton-reinforced paraffin fuel in a direct flow/swirling injection solid-gaseous hybrid combustor. The combustion process of the four conditions was compared，and the influences of the skeleton structure and injection method on the combustion were analyzed. The results showed that the regression rates of the skeleton material and the paraffin-based fuel were quite different，and the skeleton structure gradually became prominent as the combustion progressed. The turbulence intensity and fuel mass flow both affected the combustion chamber temperature，and the combustion chamber temperature volatility decreased as the combustion progressed. In the swirling injection condition，the temperature of the combustion chamber was higher than that in the direct flow injection condition， there was a high-temperature area at the head of the combustion chamber，and the axial temperature distribution was more uniform. In the direct flow injection condition， the temperature increased sharply in the middle of the combustion chamber. In addition，compared with the hexagonal skeleton，the spiral skeleton can provide greater turbulence strength under direct flow injection conditions. In the swirling injection conditions，the swirl intensity of the oxidant played a leading role in the increase of the turbulence intensity， and the skeleton structure had little effect.