Flow Analysis Inside a Pelton Turbine Bucket

[+] Author and Article Information
B. Zoppé

 Laboratoire des Ecoulements Géophysiques Industriels, B.P. 53, 38041 Grenoble Cédex 9, France

C. Pellone

 Centre National de la Recherche Scientifique, Grenoble, France

T. Maitre

 Institut National Polytechnique Grenoble, France

P. Leroy

 ALSTOM Power Hydro, B.P. 75, 38041 Grenoble, France

J. Turbomach 128(3), 500-511 (Jan 09, 2006) (12 pages) doi:10.1115/1.2184350 History: Received November 16, 2004; Revised January 09, 2006

The aim of this work is to provide a detailed experimental and numerical analysis of the flow in a fixed bucket of a Pelton turbine. The head, jet incidence, and flow rate have been varied to cover a wide range of the turbine functioning points. The experimental analysis provides measurements of pressure and torque as well as flow visualization. The numerical analysis is performed with the FLUENT code using the two-phase flow volume of fluid method. The results present a good consistency with experimental data. In particular, the pressure distribution is very well predicted for the whole range of the studied parameters. A detailed analysis of torque and thrust allows evaluating the losses due to the edge and the cutout of the bucket. These results give insight into the benefit we can expect of steady flow calculations through the optimization process of the design of Pelton turbines.

Copyright © 2006 by American Society of Mechanical Engineers
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Figure 3

Bucket experimental devices

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Figure 4

Schematic views of the bucket

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Figure 5

Location of the pressure intakes

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Figure 6

Different side and top views of the sheets of water

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Figure 7

Diagram of the calculation blocks

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Figure 8

View of the meshes

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Figure 9

Free surface of the jet

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Figure 15

Schematic view of the boundary surfaces

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Figure 18

Cut-out leakage flow rate

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Figure 19

Edge and cut-out losses

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Figure 20

Non-dimensional forces and Pelton turbine efficiency

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Figure 10

Thickness of the sheet of water in the reference plane

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Figure 11

Pressure coefficient and water volume fraction

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Figure 12

Free surface of the jet

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Figure 13

Pressure coefficient and water volume fraction

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Figure 14

Pressure coefficient: numerical and experimental results

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Figure 1

Diagram of the testing rig



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