变几何参数对变循环发动机过渡态性能的影响分析

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。

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

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) was developed, and the VPEM model of a turbojet engine was used to study the influence of the nozzle throat area and the turbine nozzle guide vane (NGV) throat area on the transient state performance of the turbojet engine. The VPEM model of the VCE was established, and it was employed to study the influence of turbine NGV throat areas, the nozzle throat area and the area of the rear variable area bypass injector (RVABI) on VCE transition state performance. The results show that the nozzle throat area and turbine NGV throat areas have significant effects on the transition state performance of VCE, 5% of area change leads to 3%, 7% and 20% change of additional power respectively, while the influence of RVABI area was week. The conclusions of this paper can provide reference for the design of the transient-state control schedule of variable geometry parameters for VCEs.