摘要
为研究端面燃烧式发动机工作内外热联合作用时对结构温度场的影响,并提高热仿真分析精度,根据发动机外防热材料的烧蚀机理及试验数据,建立外防热烧蚀精细化计算模型,并通过梳理端面燃烧式发动机试验温度数据及不同区域的内绝热结构,提出端面燃烧式发动机工作后的仿真拟合内部热流环境条件。在防热计算时同步加载外表面气动热流环境及内部燃烧拟合热流环境,考虑发动机内传热及外防热的联合作用,得到不同内绝热结构对应的温度,更加准确地掌握整体发动机结构的温度场分布,将预示精度提高至10℃以内。可广泛应用于飞行器发动机系统的舱段结构防热精细化设计,减少地面热试验,降低设计成本及研制周期。
To study the effect of combined internal and external thermal on the temperature of end burning engine structure,according to the ablation mechanism and test data of the engine external thermal protection material,the refined calculation model of external thermal ablation is established.And by combing the experimental temperature data and the internal insulation structure in different regions of end burning engine,the simulation fitting of internal heat flow environment conditions is proposed.In the calculation of heat protection,the aerodynamic heat flow environment on the external surface and the heat flow environment fitted by internal combustion should be loaded at the same time.The temperature corresponding to different internal insulation structures is obtained by the combined action of internal heat transfer and external heat protection.The accurate temperature distribution of the whole engine structure is obtained,and the prediction accuracy is improved to less than 10℃.This method can be widely used in the detailed thermal protection design of aircraft engine cabin structure,it can reduce ground thermal test,design cost and research time.
作者
金玲
张程
聂青
陈克
宋磊
JIN Ling;ZHANG Cheng;NIE Qing;CHEN Ke;SONG Lei(China Academy of Launch Vehicle Technology,Beijing,100076;College of Aerospace Science and Engineering,National University of Defense Technology,Changsha,410073)
关键词
端面燃烧
发动机
烧蚀
精细化
内外联合
end burning
engine
ablation
refinement
combination of internal and external
