核心机驱动风扇级匹配特性分析
收稿日期: 2015-01-16
修回日期: 2015-03-03
网络出版日期: 2015-03-28
Matching characteristics of core driven fan stage
Received date: 2015-01-16
Revised date: 2015-03-03
Online published: 2015-03-28
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。
张鑫 , 刘宝杰 . 核心机驱动风扇级匹配特性分析[J]. 航空学报, 2015 , 36(9) : 2850 -2858 . DOI: 10.7527/S1000-6893.2015.0060
The matching characteristics of the core driven fan stage (CDFS) in a double bypass engine (DBE) have been investigated with CDFS matching map and numerical simulation (taking the single bypass mode operating point as the design point and the double bypass mode operating mode as the matching point). The results show that given the matching massflow rate and pressure ratio in the double bypass mode, the aerodynamic load decreases for the rotor and increases for the stator. The best CDFS performance can be reached at a proper matching speed. For a given matching massflow rate and speed in the double bypass mode, both the aerodynamic loads of the rotor and stator can be increased by increasing matching pressure ratio, which in turn increase the efficiency and decrease the stall margin. If only the matching massflow rate is given, excellent performance can be reached by adjusting the matching speed and pressure ratio under a certain constraint.
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