论文部分内容阅读
基于守恒方程建立了固体燃料冲压发动机燃速仿真模型,采用二维轴对称模型和二方程化学反应模型开展了HTPB(端羟基聚丁二烯)固体燃料冲压发动机流场数值仿真,分析了不同空气来流条件对流场分布及燃速的影响.结果表明:火焰层在氧气和固体燃料壁面之间形成,随着来流空气流量和空气总温的增加,火焰层厚度变薄并向固体燃料壁面侧移动;随着发动机轴向位置的增加,燃速先迅速增加后缓慢增加,最后在补燃室附近快速减小,变化趋势与文献中试验结果吻合较好;固体燃料平均燃速随来流空气总温及发动内空气流率的增加而增大,并根据仿真结果拟合得到了燃速公式.
Based on the conservation equations, a simulation model of solid fuel ramjet combustion speed was established. The two-dimensional axisymmetric model and two-equation chemical reaction model were used to simulate the flow field of HTPB solid fuel ramjet engine. The results show that the flame layer is formed between the oxygen and the solid fuel wall, and the thickness of the flame layer becomes thinner with the increase of the incoming air flow and the total temperature of the air, As the axial position of the engine increases, the combustion rate increases rapidly and then increases slowly, and finally decreases rapidly in the vicinity of the afterburner. The trend of the change coincides with the experimental results in the literature. The average fuel burn rate of solid fuel follows The total temperature of the air flow and the air flow rate in the starting air increases, and the burning rate formula is obtained according to the simulation results.