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摘要
The expressions of unsteady gust loads are derived based on the piston theory in this paper. The aerothermoelastic response of hypersonic two degree-of-freedom airfoil is analyzed. The calculation of the unsteady aerodynamic lift and moment are given based on third-order piston theory. Also considered is the loss of torsional stiffness that may be incurred by lifting surface subject to axial stresses induced by aerodynamic heating. The aerodynamic heating effects are estimated based on the adiabatic wall temperature due to high speed airstreams. The effect of horizontal gust loads on aeroelastic response system is compared with vertical gust loads. Then the relationship between the pitching displacement amplitude and the gust velocity is analyzed. Numerical results show that horizontal gust has little effect on the stabilization system, while the vertical gust has a significant effect on the aeroelastic system. The acceleration of airfoil which is generated due to the vertical gust can cause the system to become vibrating for a long time. The results also show that pitching displacement amplitude of the aeroelastic response is in the direct proportion to the gust velocity, the proportion is about 3.8 x 10(-4).
- 出版日期2012-6
- 单位中国人民解放军国防科学技术大学
