Author(s): J. Osterwalder; L. Hippe

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Abstract: This paper deals with pumps and turbines of radial to semi-axial flow (nq^ = 20÷70), as frequently used in water power and pump-storage plants. The described sealing process is based on previous publications [1, 2, 3] and is presented here in an abridged form in an easily intelligible way. To simplify practical application, use is made of clearly set out diagrams permitting a quick determination of efficiency scaling. For a better understanding the fundamental laws are briefly reviewed with reference to the relevant bibliography. Of particular interest is the relation between the efficiency loss due to roughness and an economically justifiable extent of surface finishing of flow passages. Another important criterion is the surface roughness characterized by the term “hydraulically smooth”. Relevant numerical data can easily be determined on the basis of suitable diagrams.

DOI: https://doi.org/10.1080/00221688409499386

Year: 1984