预冷技术在涡轮冲压组合动力中的应用

Application of Pre-Cooling Technology on the TBCC Propulsion System

综合分析了预冷技术在高速飞行器推进系统上的应用,总结出预冷的结构形式及其对发动机性能的影响。研究表明,实现预冷的途径主要有两种:一是在压气机进口喷入冷却介质(如液氧、水等),二是利用预冷器。后者效率高,但设计难度较大。因此,轻质、高效的紧凑型预冷器是实现发动机预冷的关键技术。总结了先进预冷器在提高换热效率、减少压力损失和抑制结冰方面的设计技术及研究成果,可为将来预冷器的设计提供经验和技术支持。

The application of pre-cooling technologies on the combined-cycle engines for the high speed aircraft was analyzed. The pre-cooling structures and their influence on engine performance were summa-rized. Two methods of pre-cooling are proposed, one is to injecting the coolant, such as liquid oxygen, wa-ter, at the entrance of turbofan;the other is precooler. It is proved that the latter is more efficient but more complicated. Consequently the development of light, high efficient compact precooler is one of key technolo-gies for the application of pre-cooling on combined-cycle engines. The design technologies of advanced pre-cooler in the fields of the pressure drop, heat transfer rate and anti-icing were investigated and summa-rized, which could be referential and supportive for the design of precooler in future.