Laser-2-Focus Flow Measurements in the Runner of a Bulb Turbine and Comparison with Calculation

by N. Furtner, Sulzer-Escher Wyss Ltd, Zurich, Switzerland,
E. Gode, Sulzer-Escher Wyss Ltd, Zurich, Switzerland,
P. Bachmann, Sulzer-Escher Wyss Ltd, Zurich, Switzerland,

Document Type: Proceeding Paper

Part of: Waterpower '85


Flow measurements are presented, which were carried out near and inside the 4-blade runner of an axial model bulb turbine of double adjustable type. These measurements were performed by using a LASER-2-FOCUS (L2F) measurement system, developed by the Sulzer-Company, Switzerland. Velocity vectors (2-dimensional) were measured in the flow up- and downstream of the runner as well as at various cross sections between the runner blades for different operating points. It is shown, that the optical L2F measurement system is very useful in order to investigate the real flow in rotating or fixed cascades. Flow behavior measured downstream of the runner is illustrated and discussed in view of simplifications often used in theoretical approaches. If these calculations are based on inviscid flow along cylindrical streamtubes, calculated and real flow especially at runner outlet can differ significantly depending on blade section and blade loading under consideration.

Subject Headings: Flow measurement | Turbines | Comparative studies | Two-dimensional flow | Rivers and streams | Fluid flow | Fluid velocity | Water flow | Switzerland | Europe

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