某发动机喷管周围流场研究

Research of flow field around nozzle of an engine

运用Fluent流体动力学软件,采用结构化网格和RNG k-ε湍流模型研究了热试车条件下,某带高温隔热屏发动机喷管周围及隔热屏上温度场的分布,计算结果与试验结果吻合较好。研究结果表明:推进系统热试车条件下,高温隔热屏各组成部分温度均在各自耐受温度以内;高温隔热屏能有效地将发动机羽流的对流及辐射进行隔离,避免高温燃气对发动机周围的推进系统组件进行再加热。

The fluid dynamics software Fluent, structured grids and RNG k-ε turbulence model are used in this paper to research the temperature field distribution around the nozzle with high-tem- perature heat shield and on the high-temperature heat shield of an engine under the condition of the ground hot test. The calculation results agree well with the experimental results. The results show that, under the condition of the ground hot test of propulsion system, the temperature of all parts of the high-temperature heat shield is within their heat tolerance, and the high-temperature heat shield can effectively isolate the convection and radiation of engine plume and can avoid the propulsion system components around the engine from heating of high-temperature gas.