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research-article

A reference Pelton turbine - 3D Flow front tracking within a rotating Pelton bucket

[+] Author and Article Information
Bjørn W Solemslie

Postdoctoral Fellow, Waterpower Laboratory, Department of energy and process engineering, Norwegian University of Science and Technology, Alfred Getz v. 4, Norway
bjorn.w.solemslie@ntnu.no

Ole G. Dahlhaug

Professor, Waterpower Laboratory, Department of energy and process engineering, Norwegian University of Science and Technology, Alfred Getz v. 4, Norway
ole.g.dahlhaug@ntnu.no

1Corresponding author.

ASME doi:10.1115/1.4040444 History: Received December 02, 2016; Revised May 27, 2018

Abstract

A post processing method has been developed to enable the extraction of quantifiable data from images captured from within the rotating frame of reference of a Pelton turbine. The turbine tested was the reference Pelton runner, designed at the Waterpower Laboratory (NTNU). The method relies on interpolation to 3D map the inner hydraulic surface of the bucket. Interpolation has been conducted with two different schemes, i.e., Barycentric triangular and biharmonic spline, where the latter showed significant increase in accuracy. The 3D mapping provides the world coordinates of the pixels within the bucket and enables the tracking of the water front as it propagates through the bucket. The method has been described and the uncertainties have been estimated in the order of 0.4mm for most of the hydraulic surface. The results follow expected, and previously observed, behaviour and show great promise with regard to validation of numerical simulations. Results obtained by the method will be of great interest for the CFD community as it can be used as direct validation data for flow propagation with numerical methods. The method relies heavily on manual input due to the high noise and low contrast of the available images, which causes an increase in both uncertainty and time consumption. Suggestion for reducing uncertainty and time consumption are presented and will be implemented in future publications.

Copyright (c) 2018 by ASME
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