轴向喷注端面燃烧固液火箭发动机数值仿真

针对一种轴向喷注端面燃烧固液火箭发动机开展了研究,分析了该类发动机的燃烧机理,建立了考虑气-固边界耦合及燃料热解的发动机燃烧流动仿真模型,对发动机内流场进行了数值仿真.分析认为:发动机内存在端面燃烧和侧面燃烧两种燃烧状态,燃烧状态主要受氧化剂流速的影响.当氧化剂流速跨越转变速度后,燃烧状态发生改变.发动机流场数值仿真结果同样表明:不同氧化剂流速下发动机内存在上述两种燃烧状态,仿真得到的转变速度区间与文献试验结果吻合较好. 

Numerical simulation of axial-injection end-burning hybrid rocket motor

Numerical simulations of a axial-injection end-burning hybrid rocket motor were conducted. The combustion mechanism of this kind of hybrid rocket motor was studied. The simulation models of combustion and flow were established in consideration of both gas-solid interfacial coupling and solid fuel pyrolysis. Numerical simulations of motor combustion were carried out. Analysis shows that, two combustion models, end-burning and side-burning, exist in the motor, and the combustion models mainly depend on the oxidizer velocity. The combustion models change when the oxidizer velocity exceeds the transition velocity. Numerical simulation results also validate the existence of the two combustion models under different oxidizer velocities, and the range of transition velocity matches well with the experimental results in reference.