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TECHNICAL PAPERS

Flow in a Pelton Turbine Bucket: Numerical and Experimental Investigations

[+] Author and Article Information
Alexandre Perrig, François Avellan, Jean-Louis Kueny, Mohamed Farhat

Laboratory for Hydraulic Machines, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland

Etienne Parkinson

 VATECH Hydro Ltd., Rue des 2 Gares, 6, CH-1800 Vevey, Switzerland

J. Fluids Eng 128(2), 350-358 (Sep 08, 2005) (9 pages) doi:10.1115/1.2170120 History: Received January 19, 2005; Revised September 08, 2005

The aim of the paper is to present the results of investigations conducted on the free surface flow in a Pelton turbine model bucket. Unsteady numerical simulations, based on the two-phase homogeneous model, are performed together with wall pressure measurements and flow visualizations. The results obtained allow defining five distinct zones in the bucket from the flow patterns and the pressure signal shapes. The results provided by the numerical simulation are compared for each zone. The flow patterns in the buckets are analyzed from the results. An investigation of the momentum transfer between the water particles and the bucket is performed, showing the regions of the bucket surface that contribute the most to the torque. The study is also conducted for the backside of the bucket, evidencing a probable Coanda interaction between the bucket cutout area and the water jet.

FIGURES IN THIS ARTICLE
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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Single-injector horizontal Pelton turbine

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Figure 2

Computational domain

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Figure 3

Influence of mesh size on solution error for the five pressure taps

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Figure 4

Locations of the five reference pressure taps on the bucket

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Figure 5

Instrumentation and data acquisition system installed on the rotating shaft

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Figure 6

Definition of the bucket zones with respect to the pressure taps

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Figure 7

Comparison of experimental with numerical flow simulation pressure coefficient results

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Figure 8

Evolution of adjacent bucket discharge functions over the duty cycle

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Figure 9

Evolution of flow pattern along the runner rotation angle

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Figure 10

Contribution of each zone to the total mechanical power exchange as a function of the runner rotation angle. The power is normalized by the total bucket power peak value.

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Figure 11

Contribution to the total mechanical torque of the inner side of a single bucket as a function of the runner rotation angle. The computed values of the torque are normalized by the mean value of the measured torque.

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Figure 12

Bucket backside contribution to the total mechanical power exchange as a function of the runner rotation angle. The power is normalized by the total bucket power peak value.

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