变几何参数对变循环发动机过渡态性能的影响分析

Analysis for Influence of Variable Geometry Parameters on Transition State Performance of Variable Cycle Engine

关键词:  功率提取法  变循环发动机  过渡态性能  变几何参数  双轴混排涡扇发动机

Key words:  Virtual power extraction method  Variable cycle engine  Transient state performance  Variable geometry parameters  Twin-spool mixed flow turbofan engine

摘要:

为了研究变几何参数对变循环发动机（Variable Cycle Engines，VCE）过渡态性能的影响，对功率提取法（Virtual Power Extraction Method，VPEM）进行了总结与发展，并以双轴混排涡扇发动机的VPEM模型为工具,研究了尾喷管喉部面积和涡轮导向器喉部面积对双轴混排涡扇发动机过渡态性能的影响，建立了应用于双外涵VCE的VPEM模型，并以此为工具研究了高低压涡轮导向器喉部面积、尾喷管喉部面积和后可变面积涵道引射器面积对VCE过渡态性能的影响。结果表明，变几何参数对涡扇发动机和VCE过渡态性能的影响规律一致，尾喷管喉部面积和高低压涡轮导向器喉部面积增加5%带来高压转子的功率变化分别为1.9%，6%和3.5%，低压转子功率变化分别为-3%,22%和-7%，RVABI面积对过渡态性能的影响并不显著。

Abstract:

In order to study the influence of variable geometry parameters on the transient state performance of variable cycle engines (VCE), the Virtual Power Extraction Method (VPEM) is developed, and the VPEM model of a twin-spool mixed flow turbofan engine is used to study the influence of the nozzle throat area and the turbine nozzle guide vane (NGV) throat areas on the transient state performance of the turbofan engine. The VPEM model of a double bypass VCE is established, and it is employed to study the influence of high-pressure (HP) and low-pressure (LP) turbine NGV throat areas, the nozzle throat area and the area of the rear variable area bypass injector (RVABI) on VCE transition state performance. Results show that the interaction mechanism between variable geometry parameters and the VCE transient performance is the same as that of a turbofan engine. The additional power of the HP spool caused by 5% increase of the nozzle throat area, the HP and LP turbine NGV throat areas are 1.9%, 6% and 3.5% respectively, while those of the LP spool are -3%, 22% and -7% respectively. The influence of the RVABI area is week.