前緑セレーションによる平板翼の性能改善と流れの特性 : 流体工学 , 流体機械

概要

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Experimental studies on aerodynamic characteristics of a flat-plate wing with leading-edge serrations have been made for attack angles from O° to 25°. The apex angle φ of the serration is varied in arrange of 15°,30°, 60°,90° and 120°. The lift/drag ratio increases by the leading-edge serration with φ=15°-90°. The leading-edge serration is effective in increasing the stall angle and reducing the drag. The maximum drag reduction of 35% is attained for φ=15° and 30°. There exists interaction between longitudinal vortices induced by the serration and the separated flow. The effect of the interaction is surveyed in terms of distributions of time-mean velocity and turbulence intensity. The flow separation is suppressed by a secondary flow associated with the counter-rotating longitudinal vortices. The momentum defect is smaller in case with serration than without the serration. This is because the longitudinal vortices induced by the serration transport the high momentum fluid of the main flow into the separation zone.
社団法人日本機械学会の論文
2001-03-25