Thermodynamic analysis for a chemically recuperated scramjet  

作　　者：QIN Jiang BAO Wen ZHANG SiLong SONG YuFei YU DaRen 

机构地区：[1]Harbin Institute of Technology,Harbin 150001,China

出　　处：《Science China(Technological Sciences)》2012年第11期3204-3212,共9页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (General Program) (Grant No. 51106037);the Distinguished Young Scholars (Grant No. 50925625);the Innovative Research Groups(Grant No. 51121004)

摘　　要：Endothermic hydrocarbon fuel is regarded as an optimal fuel for a scramjet with regenerative cooling,which provides extra cooling through endothermic chemical conversion to avoid the severly limited cooling capacity when conventional fuels are adopted for cooling.Although endothermic cooling is proposed from the view point that the heat sink of a conventional fuel is insufficient,the heat-absorbing through endothermic chemical reaction is actually a chemical recuperation process because the wasted heat dissipated from the engine thermal structure is recovered through the endothermic chemical reaction.Therefore,the working process of a scramjet with endothermic hydrocarbon fuel cooling is a chemical recuperative cycle.To analyze the chemical recuperative cycle of a chemically recuperated scramjet engine,we defined physical and chemical recuperation effectivenesses and heating value increment rate,and derived engine performance parameters with chemical recuperation.The heat value benefits from both physical and chemical recuperations,and it increases with the increase in recuperation effectiveness.The scramjet performance parameters also increase with the increase in chemical recuperation effectiveness.The increase in chemical recuperation effectiveness improves both the performances of the fuel cooling system and the combustion system.The results of analysis prove that the existence of a chemical recuperation process greatly improves the performance of the whole scramjet.

关 键 词：SCRAMJET endothermic hydrocarbon fuel chemical recuperation regenerative cooling chemical reaction 

分 类 号：V235.21[航空宇航科学与技术—航空宇航推进理论与工程] TG178[金属学及工艺—金属表面处理]