長方形断面を有する90°曲がり管路内乱流の平均速度場解析

概要

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The numerical study has been performed on turbulent flow developing in a 90 degree curved duct of rectangular crosssection and an aspect ratio of 6. The ratio of bend mean radius of curvature to hydraulic diameter is 2.04 and straight ducts of 7.5 and 25.5 width are attached to the inlet and outlet of the bend, respectively. In addition to this straight duct, two-dimensional lateral contraction of the wind tunnel with an area ratio of 6 is considered as the numerical domain as well as the experimental apparatus. Calculated results were compared in detai with the experimental data measured for meanvelocity and Reynolds stress components. In this calculation, an algebraic Reynolds stress model was adopted in order to predict anisotropic turbulence precisely, and a boundary-fitted coordinate system was introduced as the method of coordinate transformation. As a result of the comparison with experimental data, it was found that calculated results showed good agreement with the experimental data of streamwise and transverse velocites except for that of the inner wall region of the outlet straight duct and suggested the existence of the Taylor-Gortler-type vortices on the outer wall by the distributions of secondary flow and wall shear stress.
社団法人日本機械学会の論文
1997-02-25