固体燃料冲压发动机两种内旁路构型燃烧性能数值分析

Combustion Performance Numerical Analysis on Two Styles of Inner Bypass for Solid Fuel Ramjet

使用数值模拟方法对比分析了环型通道与齿轮型通道两种内旁路构型的燃烧性能,固体燃料为丁羟,燃烧采用总包反应,反应速率由涡团耗散模型计算。研究发现,环型通道在补燃室头部产生突扩回流区,仍为扩散燃烧;齿轮型通道在补燃室头部产生对称的涡结构,能够增强未燃烧燃料与旁路空气的掺混效果,且总压损失与环型相当,综合燃烧性能较好。

Two styles of inner bypass structure, the annulus style and gear style, were numerically studied. The fuel was HTPB while the overall reaction process and Eddy-Dissipation Model were adapted. It was concluded that the combustion in the dump afterbuming chamber of annulus style was still controlled by diffuse. The gear style could induce couples of symmetrical vortexs in the head of dump afterburming chamber, which could enhance the mixing effect of unburned fuel and bypass air, and the total pressure loss was approximately approaching the annulus style, thus the combustion performance of gear style performs better.