Abstract
Scalable loss in Francis model turbine is analyzed for four runners with various number of blades which are tested in the same model turbine. The flow in the stay vane, the guide vane and the runners are analyzed by a 3D Euler flow analysis code, and then three methods of boundary layer calculations are carried out in order to obtain scalable loss. As for spiral casing and draft tube, scalable loss is obtained by the analogy of pipe flow.
From the comparison between runners, the difference in peak efficiency seems to be mainly caused by non-scalable losses. Therefore scalable loss itself is most suitable to be prescribed in the scale-up formula than loss distribution coefficient.
Problems on the effect of number of blades might be solved by using scalable loss in scale-up formulae.
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References
JSME Standard S008, Performance Conversion Method for Hydraulic Turbines and Pumps (1989).
EEC Publication 995, Determination of the Prototype Performance from Model Acceptance Tests of Hydraulic Machines with Consideration of Scale Effects (1991).
Spurk, J.H. and Grein, H., Performance Predictions of Hydraulic Machines by Dimensional Considerations, Water Power & Dam Construction (1993–11), 42–49.
Ida, T., New Formula for Efficiency Step-up of Hydraulic Turbines, Proc. 17th IAHR Symposium (Beijing, 1994 ), 827–840.
Nichtawitz, A., Discussion on Step-up Procedures in Hydraulic Machines, Proc. 17th IAHR Symposium (Beijing, 1994 ), 841–852.
Qian, Y., Arakawa, C., Kubota, T. and Suzuki, R., Numerical Flow Simulation on Channel Vortex in Francis Runner, Proc. 17th IAHR Symposium (Beijing, 1994 ), 237–247.
Kurokawa, J., Kitahora, T., et al., Prediction of Scalable Loss in Francis Runners of Different Specific Speed, Proc. 18th IAHR Symposium (Valencia, 1996 ).
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© 1996 Springer Science+Business Media Dordrecht
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Suzuki, R., Qian, Y., Kitahora, T., Kurokawa, J. (1996). An Assessment of the Loss Distribution in Francis Turbines. In: Cabrera, E., Espert, V., MartÃnez, F. (eds) Hydraulic Machinery and Cavitation. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-9385-9_36
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DOI: https://doi.org/10.1007/978-94-010-9385-9_36
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-9387-3
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