三次元渦法によるヘリコプタロータと渦との相互干渉の数値計算 : 第2報(流体工学,流体機械)

概要

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The blade-vortex-interaction (BVI) of a helicopter's two-blade rotor is analyzed by the three-dimensional discrete vortex method for various conditions including the helicopter's body. The rotor is represented by source panels and the decent vortices are shed from the tips and the trailing edges of the blades as vertex rings and a part of each vortex ring is kept within the blades. The body is also expressed by source panels. It is found that the thrust fluctuation on the blade occurs rather randomly in the region of the azimuth angle 0 to 180 degrees. The fluctuation is stronger in descending case than in horizontally flying case, and the fluctuation occurs even in the region of azimuth angle larger than 320 degrees in the descending case. The helicopter's body does not affect the characteristics of the rotor aerodynamics, but the disturbance in the wake slightly glows. It is also shown that combinations of the vortices is effective for decreasing the number of vortices without affecting the computing results.
社団法人日本機械学会の論文
2003-03-25