推力室集合器导流结构均流效果仿真与优化

Simulation and Optimization for Distribution Uniformity of Diversion Structure in Collector of Thrust Chamber

针对某膨胀循环氢氧火箭发动机推力室的集合器内周向流量分配不均匀问题,设计了一种集合器入口导流结构。采用FLUENT模型仿真得到的边区喷嘴流量分布均匀性结果为判据,对导流结构的具体几何参数进行优化,获得了导流片的最优结构参数。结果表明:优化后的导流结构可将外圈喷嘴流量分布均匀性偏差由-4.49%-1.05%收窄至-0.91%~1.12%;采用该导流结构可显著改善外圈氢喷嘴的流量分配均匀性,有助于解决由于流量分配不均导致的局部喷嘴烧蚀问题。

To solve the problem of uneven circumferential flow distribution in thrust chamber collector of expansion cycle hydrogen-oxygen rocket engine,a diversion structure was designed.The specific geometric parameters of the diversion structure were optimized base on the results of flow distribution in border region by FLUENT model,and the optimal structural parameters of diversion plate were obtained.The results showed that the optimized diversion structure could narrow the uniformity deviation of the flow distribution of the outer ring nozzle from-4.49%〜1.05%to-0.91%〜1.12%.The flow distribution uniformity of the outer ring hydrogen nozzle was improved significantly by using the diversion structure,and the problem of local nozzle ablation caused by uneven flow distribution could be solved.