为了解某双外涵变循环发动机压缩系统的风扇、核心机驱动风扇级(CDFS)和高压压气机三者之间的流动匹配机理，利用流体力学软件Numeca，在三个典型内涵道背压下，获得了单涵道模式下的外涵道节流特性。结果表明：对外涵道的节流可以实现涵道比的大幅度调节，可以通过影响风扇和CDFS的工作状态来实现外涵道增压比和内外涵道绝热效率的大幅度调节。

In order to clarify the matching flow mechanism among the fan,the core drive fan stage (CDFS) and the highpressure compressor in the compression system of a certain double bypass variablecycle engine,the fluid mechanics software Numeca was used to obtain the external throttling characteristics in the single bypass mode under three typical backpressure situations of internal bypass.The results show that the throttling of the external duct can achieve a substantial adjustment of the bypass ratio,and it can realize a substantial adjustment of the pressure ratio of the external duct and the adiabatic efficiency of double ducts by influencing the working status of the fan and CDFS.

V231.3

国家自然科学基金（51776010）