三外涵变循环发动机推力性能优化计算及分析

提出了一种基于商用软件Isight的三外涵变循环发动机稳态性能优化方法，构建了优化设计平台，扩展了稳态性能计算程序的参数研究及优化功能。利用所建立的优化设计平台，开展了典型状态点的优化计算，并与传统设计方法进行了对比；以最大状态推力最优为目标，分析了不同工况、不同工作模式的发动机稳态性能。研究结果表明:基于Isight的优化平台能够显著提高三外涵变循环发动机稳态性能优化的精度和效率，快速获得发动机最优性能；当以最大状态推力最优为目标时，随着进气温度的增加，推力最优的工作模式依次为单外涵+第三外涵模式、单外涵模式、三外涵模式和双外涵模式。 

Thrust performance optimization calculation and analysis of triple bypass variable cycle engine

Based on the commercial software Isight, a steady state performance optimization method was proposed for a triple bypass variable cycle engine, and the optimization design platform was built. In this way, the function of the steady state performance procedures was expanded, especially in the parameter study and optimization. Utilizing the platform, performance optimization of the typical engine working points was conducted, and the results were compared with the traditional method. With the help of the platform, the engine steady state performance in different working conditions and various modes was analysed. The study results show that the Isight based optimization design platform could obviously improve the design efficiency and optimization precision, and fully exert performance advantage of triple bypass variable cycle engine. For getting the maximal thrust in any conditions, the best order of the mode selection is as follows as the inlet temperature raises: the first is single bypass adding third bypass mode, the second is single bypass mode, the third is triple bypass mode and the last is double bypass mode.