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斜置翼飞行器是一种通过改变扫掠角而能在亚声速、跨声速、超声速三个速度段都能获得最优效率的宽速域飞行器。根据斜置翼的设计需求,其基本翼型应该是超临界翼型,翼型选择应在考虑翼型最佳气动效率的同时兼顾翼型内部有效体积和操稳特性。基于以上选型标准,先从NASA超临界翼型族中选出5种超临界翼型,然后运用商业CFD软件Fluent对这5种超临界翼型的气动特性进行计算。最后通过对比分析这5种翼型的气动特性、几何参数和操稳特性,选择性能较优的NASA SC(2)-0714翼型作为斜置翼的基本翼型。
A slant-wing aircraft is a wide-speed aircraft capable of obtaining optimal efficiency at subsonic, transonic and supersonic speeds by changing the sweep angle. According to the design requirements of inclined wing, the basic airfoil should be the supercritical airfoil. The choice of airfoil should take into account the effective aerodynamic efficiency of the airfoil and the effective internal volume and handling characteristics of the airfoil. Based on the selection criteria above, five kinds of supercritical airfoils were selected from the NASA supercritical airfoils and the aerodynamic characteristics of the five kinds of supercritical airfoils were calculated by commercial CFD software Fluent. Finally, by comparing the aerodynamic characteristics, geometric parameters and handling characteristics of the five airfoils, the NASA SC (2) -0714 airfoil with better performance is selected as the basic airfoil with oblique wings.