涵道引射器是变循环发动机的核心部件之一，其几何结构和工作状态会随着发动机工作模式的转换而显著改变，同时受到剪切流动、弯曲流道和非均匀来流的影响，流场表现出变工况、变几何情况下多尺度涡结构相互作用的复杂流动现象。目前涵道引射器流动机理尚不明确，限制了变循环发动机实现精细设计，难以满足先进飞行器对核心动力装置的需求。本项目以国内目前在研的变循环发动机为研究对象，针对涵道引射器流场中剪切、分离相互作用的复杂流动现象，发展能够捕获精细流场结构的高精度混合RANS/LES数值模拟方法，开展变循环发动机单/双外涵模式以及过渡态下涵道引射器复杂流动机理研究。本项目的实施，预期建立准确可靠的内流复杂构型高精度数值模拟研究手段，旨在揭示实际工程环境中涵道引射器多尺度涡结构相互作用的流动机制，为先进变循环发动机设计提供技术手段和基础理论支撑。

Bypass injector is one of the core components of the Variable Cycle Engine (VCE), and its geometric structure and working state significantly change with the VCE mode transition. Under the influence of shear flow, curved path and non-uniform inflow, the bypass injector flow field shows the very complex phenomenon of multi-scale vortex structure interaction with variable working condition and geometry. The flow mechanism of bypass injector is still not clear, which limits refined design of the VCE to satisfy the advanced aircraft requirement. Focusing on the interaction of shear flow and separation in the bypass injector, the high-order hybrid RANS/LES method will be developed to capture the detailed flow structure, and the complex flow mechanism will be studied under single/double bypass mode and transient state. The implementation of this project is expected to establish an accurate and reliable high-resolution numerical simulation method for internal flow with complex geometry, and reveal the flow mechanism of the multi-scale vortex structure interaction of the bypass injector in an engineering environment, to support technical means and fundamental theory to the design of advanced VCE.