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Erschienen in:
1996 | OriginalPaper | Buchkapitel
Interdependence of Draft Tube and Tailwater Flow in Bulb Turbine Power Plants
verfasst von : CH. Schneider, W. Knapp, R. Schilling
Erschienen in: Hydraulic Machinery and Cavitation
Verlag: Springer Netherlands
Enthalten in: Professional Book Archive
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The advantages of bulb turbines result mainly from smaller dimensions and better efficiencies in comparison to the vertical-axis Kaplan type used earlier. Bulb turbines are characterized by high values of specific speed n q which is closely related to the unit discharge Q´1. Optimum results have been obtained with Q´1-values that rise in proportion with the specific speed. As the specific velocity head h c1/H at the runner exit increases with the square of the unit flow Q´1 an efficient deceleration of the flow in the draft tube is decisive for the performance of high specific speed turbines. Still the exit losses increase with the specific speed n q and may reach values of 5% or more of the available head.