This paper presents an analysis to evaluate the aerodynamic effect of blade tip shapes. The shapes include the subwing, which reduces BVI (Blade Vortex Interaction) noise by dividing the tip vortex into a pair of vortices. Several types of tip shapes are analyzed in the non-rotating condition. One of them is a canard tip shape, which has two subwings and is based on the concept of advanced fighters' canard wing. The results of the calculation were compared with the wind tunnel test about aerodynamic loads and the wake of wing tips. The comparisons of the calculation and the wind tunnel test shows that the positions of each tip vortex are approximately equal but the calculated strength of the vortex has more attenuation than the experimental one. It was found that the canard tip could diffuse the vortex effectively.
サブウィングを有したブレード翼端形状の空力解析
nalsp0044011.pdf
(517.78KB)
