几何调节对变循环核心机过渡态性能影响研究

Influence Research on Geometry Adjustment to Variable Cycle Core Engine Transient Performance

本文针对几何调节对变循环核心机过渡态性能影响开展研究,分析了供油规律、核心机驱动风扇级(CDFS)导叶角度、外涵喷管面积对变循环核心机影响。仿真结果表明:在现有部件特性和仿真模型基础上,变循环核心机加速过程中CDFS导叶角度变化对加速时间影响较小,但会影响CDFS稳定裕度,裕度最大变化5%;减速过程中CDFS导叶角度变化对燃烧室稳定燃烧有一定影响。加速过程中,不同的外涵喷管面积调节规律对CDFS和压气机稳定裕度影响较大;减速过程中对CDFS稳定裕度有一定影响,但对压气机稳定裕度影响较小。

In this paper, the influence of geometry adjustment to variable cycle core engine transient performance is studied, including fuel supply law, inlet guide angle of core driven fan stage, and the bypass nozzle area. The results show: the performance of variable cycle core engine acceleration is influenced by the variation of CDFS inlet guide angle slightly, while the CDFS stability margin is affected significantly. In the deceleration process, the stable combustion performance and deceleration time are influenced by the variation of CDFS inlet guide angle seriously. The variation of bypass nozzle area almost could not affect the acceleration time of variable cycle core engine, however the stability margins of CDFS and compressor are affected obviously. In the deceleration process, the deceleration time and CDFS stability margin are influenced largely, and the compressor stability margin has no change.