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Erschienen in:
1996 | OriginalPaper | Buchkapitel
Friction Loss of Rough Wall Passage in a Turbomachinery
verfasst von : S. Akaike
Erschienen in: Hydraulic Machinery and Cavitation
Verlag: Springer Netherlands
Enthalten in: Professional Book Archive
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An impeller or a flow passage in a turbomachinery is normally made from casting and the wall surface of the passage is usually not hydraulically smooth on the friction loss. When the friction loss of the passage is estimated by using the friction loss coefficient, it is necessary to consider the effect of the roughness of the passage wall. The friction loss coefficient of the passage is commonly obtained from the well known formulae based on the equivalent sand roughness Ks, However, the roughness of the surface of a prototype turbomachinery is expressed by the arithmetic average roughness Ra. Therefore, it is necessary to determine the correlation between Ks and Ra, or to obtain the formula of the loss coefficient based on Ra.