主流中の縦渦列と干渉した乱流境界層の乱流場のスパン方向変化

概要

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A vortical structure within a turbulent boundary layer and spanwise variation of turbulent flowfields have been investigated for further understanding of the development of turbulent boundary layer interacting with the spanwise periodic longitudinal vortex arrays which is artificially generated in a free stream. One of the parameters, spanwise periodicity of longitudinal vortices L/S (L denotes the spanwise distance between neighboring airfoils, S airfoil span), rules both magnitude and streamwise path of secondary vortices caused within the turbulent boundary layer. As a result, whether the turbulent quantities show linear or nonlinear interaction is significantly dependent on the value of L/S. Therefore, in the case of L/S< 1, although the spanwise distortion of turbulent quantities in the outer region is not remarkable, those spanwise periods change in the streamwise direction due to the rapid vortex diffusion following corotating vortex amalgamation. However, in the case of L/S >1, turbulent quantities show a noticeable spanwise periodic variation corresponding to the arrangement of airfoil elements, and those spanwise periods are strictly maintained. Comparing the spanwise variations of turbulent flowfield and those of mean flowfield, mechanisms of spanwise variation of turbulent boundary layer are discussed.
一般社団法人日本機械学会の論文
1993-03-25