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전현태(H. T. Jeon),남상현(S. H. Nam),최영도(Y. D. Choi),김유택(Y. T. Kim),이영호(Y. H. Lee) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Small hydropower attracts attention because of its clean, renewable and abundant energy resources to develop. However, suitable draft-tube type is not determined yet because of its complicated internal flow and unstable turbine performance at the partial flow rate by the influence of the draft tube configuration. Therefore, it is necessary to study the influence of draft tube shape. The purpose of this study is to investigate the influence of the draft tube shape to its internal flow using CFD analysis. The results using two different computational models (draft tube without runner and draft tube with runner) are compared. The result which is computed without runner show that large secondary flow occurs at the curve area of the draft tube and the secondary flow goes out to the outlet of the draft tube. Another result which is computed with runner show that internal flow has complex flow in the whole flow field of the draft tube.