侧滑双三角翼大迎角气动特性与旋涡的关系

 本文对不同展弦比双三角翼有侧滑时的气动力进行了实验研究,α=--3°～42°,β=--20°～20°,雷诺数为1.3×10~6。为分析测力结果,作了测压、空时流场及油流等实验。研究表明,不对称来流使机翼迎风侧旋涡绕合推迟,涡破裂提前,背风侧则相反。有侧滑时机翼不对称涡破裂对气动力影响显著,引起大迎角时滚转不稳定。

THE RELATIONSHIP BETWEEN THE AERODYNAMIC CHARACTERISTICS OF DOUBLE-DELTA WINGS AND VORTICES WITH SIDESHIPS AT HIGH ANGLES OF ATTACK

An experimental study of the aerodynamic forces on double-deltawings with sideslips is presented,a =-3°~42 ,B=-20°~20 , Re=1.3×106°.Force, pressure, spatial flow measurements and flow visualizationshave been carried out.Results show that the sideslip makes the join ofvortices on the windward side is delayed, but the vortex will break downearlier, on the leeward side the opposite is true. The asymetric vortexbreak down has important effects on the aerodynamic forces, and makesrolling moment unstable at high angle of attach.