微小粗さ列を使用した三次元境界層横流れ遷移の制御(流体工学, 流体機械)

概要

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Controlling mechanism of the crossflow dominated transition process in the three-dimensional boundary layer using a small sized roughness is investigated. The stationary crossflow vortices are excited by placing the first roughness elements for the wavelength of λ_n = 12.5 mm in the spanwise direction, which is equal to the most amplified wavelength under the natural condition, on a swept flat-plate model. The second roughness elements are located three different points between the stationary crossflow vortices. We found that the characteristic asymmetric structure of the stationary crossflow vortices becomes symmetric so that the high shear regions in the vortices are diminished when we located the second roughness at - 1/3 of λ_n with respect to the first roughness. As a result, generation of the high frequency secondary instability is overdue and the delay of turbulent transition has been attained.
一般社団法人日本機械学会の論文
2002-05-25