S字形状ディフューザ管路内乱流の応力場解析

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A numerical analysis has been carried out for developing turbulent flow in a diffuser with S-shaped centerline at a Reynolds number of 4×10^4. The diffuser exit-to-inlet area ratio was 1.5 and the inler cross section was square, 40mm×40mm, and expanded on both curved surfaces to an enitplane section of 40mm×60mm. The S-shaped curvature was formed from two 22.5 degree bends of 280mm mean radius of curvature. Straight ducts 0.3m and 2m long are attached to the inlet and outlet planes of the S-shaped diffuser, respectively. In the 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. Special attention is paid to the comparison of Reynolds stresses between calculation results and experimental data. In addition, the difference in turbulent structure between S-shaped diffuser and S-shaped duct is presented by invariant analysis using the calculation results. The present method can be used accurate prediction of the characteristic features of normal and shear stresses. Invariant maps of the S-shaped diffuser show that the turbulent structure transforms anisotropic turbulent flow into a two-dimensional turbulent flow. Moreover, the calculation results suggent that the turbulence level of the S-shaped diffuser increases more actively than does that of the S-shaped duct.
一般社団法人日本機械学会の論文
1997-11-25

S字形状ディフューザ管路内乱流の応力場解析

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