基于Busemann双翼的三维高超声速机翼研究

To study on the performance of the hypersonic wing of Busemann biplane airfoils, a hypersonic wing based on the Busemann biplane airfoil is constructed. The aerodynamic characteristics in the hypersonic flow and the influence of temperature on the natural frequencies of the first six modes are studied. Considering complexity of the hypersonic flow and the variety of the disciplines involved, the Busemann biplane is proved theoretically to be able to improve the lift-to-drag ratio, and then the aerodynamic characteristics of the Busemann biplane in the hypersonic flow and its mechanism of reducing drag, increasing lift, and reducing wing tip vortex are studied by numerical simulation. In addition, the hierarchical theory is used to simplify the complex coupling relationship between the disciplines of hypersonic wings, and the effect of temperature on the mode of the hypersonic Busemann biplane is studied. It is shown that the Busemann biplane can significantly improve the lift-to-drag ratio of wings and weaken the strength of the wing tip vortex: the lift coefficient of the Busemann biplane is increased by 28.95%, the drag coefficient is reduced by 13.58%, and the lift-to-drag ratio is increased obviously by 13.53% of that the diamond monoplane. At the same time, at 1 300 ℃, the first-order natural frequency of the Busemann biplane increases by 99.8% of that of the diamond wing, showing that Busemann biplane have better ability to resist bending. The first-order natural frequency of the Busemann biplane at 1 300 ℃ decreases by 34.2% of that at 20 ℃, indicating that the effect of high temperature on the structural performance of the Busemann biplane cannot be neglected.