带有中心预燃室的冲压发动机数值模拟研究

为提高低压条件下燃烧室点火和火焰稳定性能,设计了一种中心预燃室结构的冲压发动机。运用数值模拟方法对简化燃烧室内部的喷雾燃烧流场进行了分析。结果表明:随着燃烧室工作阶段的不同,预燃室尾部收缩段对内外涵气流相互作用的影响存在差异;由于局部压差的增大,预燃室取气口将出现局部加速效应;预燃室内流动过程受下游燃烧的影响。

Numerical Study on a Ramjet Combustor with Center Preburner

A ramjet with a center preburner was designed for the purpose of intensifying the ability of ignition and flamehold characteristic at low pressures. The numerical studies were conducted to investigate the spray and combustion characteristics in the simplified model combustion. The result reveals that, with the change of the work conditions, the convergent rear of the preburner has a different impact on the interaction between the inner and the outer flow. The flow at the entrance of the preburner will accelerate due to the increase in the pressure drop and combustion occurring downstream affects the flow characteristics in the preburner.