新型无尾联接翼布局气动特性研究

提出一种上下错开的无尾联接翼,即前翼或者后翼上反一定角度,使得前后翼垂直方向的相对距离从翼根处开始到翼梢处逐渐增大,以达到减小前后翼气动干扰的目的,搭接的小翼具有翼梢小翼作用,可有效减小诱导阻力。采用基于RANS方程的数值方法,研究了前后翼分别上反10°,20°和30°时对总体气动特性的影响,结果表明,当前翼上反且上反角为30°时其联接翼系统气动性能最佳。对该联接翼布局在Ma=0.85,0.95和1.20下进行了数值分析,结果表明,其升力系数变化较小,阻力系数在Ma0.85后才急剧增大,有应用于未来跨声速/超声速客机布局的潜力。

Research on aerodynamic performance of a new tailless joined wing configuration

A new joined wing configuration was presented, that is the front/rear wing has certain dihedral angle.The vertical distance between front and rear wings was gradually increased.The connection part has similar function to winglet, and the aerodynamic interference effect between wings could be reduced.RANS based simulations were made to investigate aerodynamic effect of different dihedral angles (10°, 20°, and 30°).Results show that 30° dihedral angle of front wing could lead to maximum aerodynamic efficiency.Numerical simulations with different Mach number (0.85, 0.95, and 1.20) were also presented.The lift coefficient is approximately constant and the drag coefficient will not rapidly increase until Mach number is bigger than 0.85, indicating that it has the potential for being used in the future transonic/supersonic civil transport aircraft.