Multiphysics Coupled Modeling of Aero-Engine Aerodynamic Stability in Initial Design Phase: Integration of Inlet Distortion Effects

Intake distortion has a direct impact on the overall efficiency and pressure ratio of the compressor, and in severe cases, it poses a threat to the stability margin of the engine, causing more serious problems such as thrust and flameout. The initial design phase of an aero-engine needs to quickly assess the stability margin of the system to ensure safety, but the traditional modeling method pays more attention to the internal control logic and conventional environmental factors such as altitude and temperature and does not sufficiently study the impact of complex non-uniform conditions such as intake air distortion. In this paper, for the characteristics of incomplete information and short evaluation cycle in the initial design stage, the stability model of the coupled aerodynamic system is considered on the basis of the traditional thermodynamic model, so that the whole engine model has the ability to take into account the influence brought by intake air distortion. Based on the Simulink platform, a modular multidisciplinary coupled engine model is constructed to achieve an efficient quantitative analysis of intake air distortion on the performance and stability margin of the engine. The research results provide a reliable tool for the rapid assessment of the anti-distortion capability of the engine at the early stage of design, which is of theoretical value and engineering significance for improving the safety and design efficiency of the engine.