円弧薄翼による鈍頭物体の抵抗減少特性

概要

論文の詳細を見る
An attempt is made to control the wake behind a bluff-based body and to reduce its form drag with the aid of thin circular-arc guide vanes installed at the base corner. Measurements of the drag, base pressure and pressure distribution of the wake, and visualization of the near wake flow are carried out. They are performed over a wide range of the chord length, C, curvature radius, R, setting clearance, S, and Reynolds number, R_e. The wake is able to be well controlled by adequately installing guide vanes, and the ase pressure remarkably improves. As a result, the drag coefficient decreases to about 25 per cent. The optimum configuration of vanes is R/B ≃ 1, C/B ≃ 0.5 and S/δ^* ≃ 1 or R/B ≃ 0.75, C/B ≃ 0.5 and S/δ≃ 0.5, where B is the body width, and δ and δ^* is the boundary layer thickness and its displacement thickness, respectively.
一般社団法人日本機械学会の論文
1986-08-25