断面形状変化を伴うだ円断面管路内の乱流構造解析〔流体工学, 流体機械〕

概要

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Numerical study of developing turbulent flow in a distorted elliptical duct was carried out at Reynolds number 0.988×10^5 by using algebraic Reynolds stress model. In a distorted elliptical duct, the configuration of cross section varies from elliptical to circular and from circular to elliptical along streamwise direction with keeping cross sectional area constant. Calculated results for three components of velocity and the five of the six Reynolds stress components were compared with the measuring data at seven different locations to clarify the validity of the present method and the development of turbulent structure. As a result of this numerical study, it was found that the distributions of streamwise velocity, the secondary flow and the averaged intensity of the secondary flow over cross section were reproduced by the present method. Adding to these points, both results displayed that the secondary flow of the second kind at inlet section transformed that of the first kind induced by the pressure gradient at a little distance from the inlet and that of the first kind again transformed that of the second kind at the outlet section. As for the comparison of Reynolds stresses between both results, the present method was able to realize characteristic features of normal and shear stresses qualitatively except for the spanwise normal stress.
一般社団法人日本機械学会の論文
1998-06-25