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核心机驱动风扇级(CDFS)是双涵道变循环发动机(DBE)的核心部件之一。为了深入研究CDFS在双涵道模式下的特点,利用CDFS匹配特性图,结合三维数值模拟分析了DBE中CDFS的匹配特性(单涵道模式工作点为设计点,双涵道模式工作点为匹配点)。结果表明,给定双涵道模式的匹配流量和压比时,增加匹配转速使转子负荷降低,静子负荷增加,可以调整匹配转速使CDFS性能最佳;给定双涵道模式的匹配流量和转速时,增加匹配压比使转子和静子的负荷同时增加,匹配压比较高时,工作点效率较高但裕度较低;仅给定匹配流量时,可以调整匹配转速和压比改变CDFS在双涵道模式的工作特性,获得满足某个约束条件的最佳状态。
Core Drive Fan Stage (CDFS) is one of the core components of a dual-bypass variable cycle engine (DBE). In order to further study the characteristics of CDFS in the dual-lane mode, CDFS matching characteristics map and three-dimensional numerical simulation were used to analyze the matching characteristics of CDFS in DBE (single-lane mode is the design point and dual-lane mode is the matching point point). The results show that the CDFS performance can be optimized by adjusting the matching speed when the matched flow rate and the pressure ratio of the two-lane mode are given by increasing the matching speed so that the rotor load is reduced and the stator load is increased. , Increasing the matching pressure ratio increases the load of the rotor and the stator at the same time. When the matching pressure ratio is high, the working point has higher efficiency but lower margin; and the matching speed and pressure ratio can be adjusted only when the matching flow rate is adjusted. The working characteristics of the tunnel mode get the best condition to satisfy a certain constraint.