发动机喷流干扰对底部热环境影响研究

发动机底部热环境的准确预示是小型运载火箭研制的关键环节。为提升对小型运载器底部热环境的认识,开展了发动机喷流干扰对底部对流加热影响的研究。首先,采用计算流体力学方法,开展了发动机喷流流动的数值计算研究,分析了飞行高度、发动机开关机、飞行攻角对底部对流加热的影响;然后,从流动机理出发,提出了一种降低底部对流加热的外形优化方法;最后,根据飞行试验测量结果,讨论了底部加热的主要来源。

Impact of Engine Jet on Bottom Aeroheating Environment

Accurate prediction of engine bottom aeroheating environment is a key problem in the design of small launch vehicles. In this paper, the characteristic of heating environment on engine bottom is investigated. First, a serials of numerical simulations are conducted to simulate the flow field on the launch vehicle''s engines and rear section, analyzing the influence of height, angle of attack and jet of engine. A method for bottom heat mitigation is proposed based on flow property. Finally, the main source of heating is discussed based on the flight test data.