This paper presents an experimental study to evaluate the aerodynamic effect of blade tip shape. The blade tip includes the subwing which reduces BVI (Blade Vortex Interaction) noise by dividing the tip vortex into a pair of vortices. The wind tunnel test using several types of tip shape is conducted on the non-rotating condition. One of them is a canard tip, which has two subwings and is based on the concept of advanced fighter's canard wing. From the results of wake surveys using a system of a five-hole yaw meter affixed to a wake traverser, the canard tip shows the effective results of the diffusion of wing tip vortex by the interaction between the front wing tip vortex and aft one.
サブウィングを有したブレード翼端形状の風洞試験
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