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在对变循环发动机总体结构进行分析的基础上,参考双轴涡扇发动机部件模型的建立方法,建立了变循环发动机部件级数学模型.建立了区分叶根特性和叶尖特性的风扇部件模型,单外涵和双外涵模式的核心驱动风扇级数学模型.根据变循环发动机的特点,建立了反映变几何部件变化的稳态和动态共同工作方程.数字仿真结果表明:所建的变循环发动机模型能够实现工作模式之间的相互转换,并且在低空低马赫数双外涵模式下表现出了涡扇发动机特性,即高推力与低耗油率,而在高空高马赫数单外涵模式下相比涡扇模式提供的推力更大、耗油率更低,符合变循环发动机特点,验证了建模方法的可行性.
Based on the analysis of the general structure of the variable cycle engine, a part-level mathematical model of a variable cycle engine is established with reference to the method of building a bimodal turbofan engine component model, and a model of a fan component that distinguishes the root characteristics from the blade tip characteristics is established. Single-core and double-connotation mode.According to the characteristics of variable cycle engine, the steady-state and dynamic common working equations that reflect the change of variable geometry components are established.The numerical simulation results show that the built variable cycle engine The model can realize the conversion between working modes, and shows the characteristics of turbofan engine with high thrust and low fuel consumption in the low altitude and low Mach number double extrinsic mode. Compared to the turbofan mode to provide greater thrust, lower fuel consumption, in line with variable cycle engine characteristics, verify the feasibility of modeling methods.