鸭翼涡与边条涡对前掠翼布局的增升研究

Study on Lift-enhancement of Canard Vortex and Strake Vortex to Configuration With Forward-swept Wing

为了研究鸭翼、边条对前掠翼布局气动性能的影响,采用三维N-S方程,分别计算了加装鸭翼、边条及鸭翼边条组合的前掠翼模型纵向气动性能,并通过流场显示分析了旋涡流动机理。研究表明,3种模型均可有效改善前掠翼布局的升阻特性。前掠翼加装鸭翼后,鸭翼分离涡的下洗作用使机翼上翼面的分离区减小,能有效控制机翼表面流动,最大升力系数提高40%;加装边条后,边条翼产生的边条涡干扰推迟了前掠翼翼根气流分离,并产生涡升力,升阻特性优于基本翼;同时加装鸭翼与边条,鸭翼涡与边条涡相互诱导,增强了对机翼表面流动的控制能力,最大升力系数比加装鸭翼模型提高3%左右,气动性能显著改善。

In with forward wing （FSW） order to - swept study the inflection of canard and strake on the aerodynamic characteristics of configuration wing （ FSW）, longitudinal aerodynamic characteristics of configuration with forward - swept installing canards,strakes and canard strake combination are calculated by using three dimension N - S equations, and then the vortex mechanism is analyzed by streamlines display. The resuhs indicate that all three models can enhance the lift - drag characteristics of FSW. After installing canard , the separated region of the wing upper - surface is diminished by the downwash effect of canard vortex and it can control the flow on the wing surface effectively. The maximal lift of the airfoil is increased about 40%. Flow separation at the root of FSW was interfered and deferred by the strake vortex after installing strake and it also produces vortex lift The lift -drag charac- teristics is better than primordial wing. After installing canard strake combination, canard vortex and strake vortex induces mutually, and enhance the control ability to the flow on the wing surface. The maximal lift of the airfoil is increased about 3% than installing canard; the aerodynamic characteristics are remarkably improved.