1种自适应循环发动机亚声速巡航节流性能研究

Study on Subsonic Cruise Throttling Performance of an Adaptive Cycle Engine

推进系统亚声速巡航的燃油经济性是决定战斗机作战半径的主要指标。在巡航过程中会因减少发动机推力带来进气道溢流量增加,使推进系统燃油经济性降低。自适应循环发动机如何利用自身变循环特征减小进气道溢流进而提高推进系统燃油经济性是解决这一问题的关键。研究了1种在亚声速巡航状态带可变风扇系统的自适应循环发动机,利用自身变循环特征,实现等流量降低推力的方法。通过对可变几何机构组合调节的研究,获取了等流量节流方案,并分析了发动机在这一过程中的性能和匹配情况。结果表明:这种带可变风扇系统的自适应循环发动机能够在一定推力范围内实现等流量节流,减少进气道溢流量,提升推进系统在亚声速巡航状态的燃油经济性。

Fuel economy of propulsion system during subsonic cruise is the main index to determine combat radius of fighter. Duringcruise,the overflow of the inlet will be increased when reducing the thrust of the engine,which will reduce the fuel efficiency of thepropulsion system. The key to solve this problem is how when reduce the inlet overflow and improve the fuel efficiency of the propulsionsystem by using the variable cycle characteristics of the adaptive cycle engine. An adaptive cycle engine with convertible fan system atsubsonic cruising state was studied. By using its own variable cycle characteristics,the method of reducing thrust with equal flow rate wasstudied. Through the study on the combination regulation of variable geometry mechanism,the equal flow throttling scheme was obtained,and the performance and matching of engine in this process were analyzed. The results show that the adaptive cycle engine with convertiblefan system can realize constant flow throttling within a certain thrust range,reduce inlet overflow flow,and improve fuel efficiency ofpropulsion system at subsonic cruise state.