Pit-Type Bulb Turbines—An Economic Solution for Low-Head Applications

by Franz Strohmer, Voest-Alpine AG, Linz, Austria, Voest-Alpine AG, Linz, Austria,
Kurt Wolfartsberger, Voest-Alpine AG, Linz, Austria, Voest-Alpine AG, Linz, Austria,

Document Type: Proceeding Paper

Part of: Water Power '87


For improving the profitability of extremely low head power plants the pit-type bulb turbine conception was developed, based on extensive model tests and on the operating experience with bulb turbines. The basic difference compared to a bulb turbine, where the generator is coupled directly to the turbine shaft, is the arrangement of a speed increaser between turbine and generator. Resulting from this conception, some advantages arise which improve the feasibility compared to the bulb and other tubular type turbines. In this paper the basic conceptual differences and the resulting advantages of the pit-type bulb turbine compared to the directly driven unit are summarized. The conceptual design, important design features as well as the erection procedure are presented.

Subject Headings: Turbines | Economic factors | Head (fluid mechanics) | Conceptual design | Hydraulic design | Hydro power | Power plants | Profits

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