A Multi-field Coupled Method Of Aerothermoelastic Behavior And Its Implementation

Aerothermoelastic behavior in hypersonic flow is receiving more and more attention with the continuous improvement of the flight speed. Unlike conventional aeroelastic problems, aerothermoelastic problems must take into count the effects of high temperature, boundary layer, structure thermal conduction and thermal radiation, and should be solved with a multidisciplinary method including CFD, CSD and CTD. In response to these problems, a research is carried out on aerothermoelastic problems of hypersonic wing based on multi-field coupled method in this dissertation.Based on coupled thermal-structure analysis method, thermal effects on dynamical property of structure are studied. Then a triple field fluid-thermal-structure coupling strategy is proposed and implemented. Two cases about hypersonic aircraft wing are conducted on computing cluster to verify this implementation and the results are summarized.Computed results show that, aerodynamic heating on structure leads to decrease of vibration frequency generally. But the vibration modal show complex transform with the variation of heat flux intensity.