The research on the nonlinear coupling problems of aerodynamics/structure/propulsion for air-breathing vehicle

For the airframe/propulsion integrated characteristics of air-breathing vehicle, the influence of structure vibration is considered when we study the coupling of inflow-outflow and fluid-structure. The nonlinear problem on the fluid-structure coupling is the key issue. In order to reduce the computation cost, the proper orthogonal decomposition (POD) is used to simplify the analysis of flow field. The test examples of wing profile and air-breathing vehicle show that POD can reduce the computation orders, and the results are high accuracy. Besides, the coupled analysis of inflow and outflow based on one dimensional method is validated by experiments, which shows that the 1-D method can be used to the airframe/propulsion integrated analysis in the early design stage of air-breathing vehicle. Finally, the plate’s nonlinear dynamics is studied under different dynamic pressures by POD and finite element method.