侧喷干扰高温燃气效应讨论

在实验或计算中，通常采用冷喷流（或某种程度上的等效气体喷流，或无反应多组分混合气体喷流）开展侧喷干扰研究，这种处理方法在具有轨迹控制发动机的未来先进飞行器的设计中可能会产生问题。简要回顾了侧喷干扰气体模型对力和力矩影响的实验和计算研究成果，针对满足实际应用需求的大喷流动量比情形，开展了冷喷流、无反应气体喷流和反应气体喷流计算模型对典型锥-柱-裙外形的力、力矩以及侧喷干扰区域内气动加热峰值影响的研究。结果表明:无喷流条件下，反应对力和力矩的影响非常微小；开启喷流后，3种气体模型的法向力差异约4%~15%，力矩差异大于20%。冷喷流不能用于预测侧喷干扰峰值热流，反应气体喷流干扰峰值热流计算结果比无反应混合气体高13%。满足应用需求的大喷流动量比侧喷干扰的力学特性和峰值热流分布，均需开展复现高温燃气效应的实验验证。

Effects of the high temperature exhaust plume reaction on lateral jet interactions

A cold jet exhaust or a somewhat equivalent gas jet exhaust or a non-reacting gas mixture exhaust is usually adopted to study the jet interaction effects in experimental or computational work, but problems may arise in the design work of an advanced future vehicle using a divert thruster. Firstly the experimental and computational results in the available literatures about the influence of different gas models on the force and moment are reviewed. Then as a supplement study result, the forces and moments acting on the body, and the peak aerodynamic heating exerting on the lateral jet interaction areas by the cold jet exhaust plume, the non-reacting mixture jet exhaust plume and the reacting mixture exhaust plume models are presented for a typical cone-cylinder-flare body with a practical-use high momentum ratio divert jet. The calculated results show that when the lateral jet is turned off the chemical reactions have very limited influence on the forces and moments, but when the lateral jet is turned on the three different gas models give 4%~15% difference for normal forces and about 20% difference for interaction pitching moments. As the cold jet model can not be used to predict the aerodynamic heating property the chemical reaction effects on the peak aerodynamic heating exerting on the lateral jet interaction areas are studied by comparison between the non-reacting gas mixture model and the reacting gas mixture model, and 13% increase is found when considering the chemical effects. The lateral interaction mechanical property and peak heating results for the cone-cylinder-flare body with practical-use high-momentum ratio divert jet put forward a demand for experimental verification reproducing high temperature exhaust plume reaction effects.