流-固-推进耦合下的机体/推进一体化性能分析

The integrated performance is sensitive to the disturbance for the air-breathing vehicle. In high Mach number condition, the research on the fluid-structure-propulsion coupling analysis is very important. The air-breathing vehicle is studied in this paper. The coupling relationship and problem are cleared. The method of fluid-structure-propulsion coupling analysis for aerospace is established based on CFD, finite element method and quasi one dimensional method. The rapidly analyzed method of multi-physical coupling is introduced by Proper Orthogonal Decomposition (POD) method. The coupling performance is studied. The results show that: (1) The exit maximum pressure oscillation amplitude is 21.6% of the average pressure under the influence of fluid-structure interaction on inlet compression surface, and the maximum Mach number oscillation amplitude is 8.45% of the average Mach number. (2) The vibration of the inlet exit performance will influence the thrust performance of the engine. The vibration amplitude of the thrust can reach up to 31% of the average performance. As the time goes on, a large amount of aerodynamic eddies are produced in the external compressed flow field of the inlet. When eddies enter into the inlet, the inlet exit average performance decreases, which further reduces the thrust of the engine.