Out with the old, in with the new:Pelton hydro turbine performance influence utilising three different injector geometries

Petley, Sean and Zidonis, Audrius and Panagiotopoulos, Alexandros and Benzon, Shaun and Aggidis, George Athanasios and Anagnostopoulos, Ioannis and Papantonis, Dimitris (2019) Out with the old, in with the new:Pelton hydro turbine performance influence utilising three different injector geometries. Journal of Fluids Engineering, 141 (8). ISSN 0098-2202

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Abstract

In previous works the authors presented CFD results, which showed that injectors with noticeably steeper nozzle and spear angles 110° & 70° and 150° & 90° respectively, attain higher efficiency than the industry standard 80° & 55°. Moreover, experimental testing of the entire Pelton system showed that gains of about 1% in efficiency can be achieved, however there appears to be an upper limit beyond which steeper designs are no longer optimal. This study aims at providing further insight by presenting additional CFD analysis of the runner, which has been coupled with the jet profile from the aforementioned injectors. The results are compared by examining the impact the jet shape has on the runner torque profile during the bucket cycle and the influence this has on turbine efficiency. It can be concluded that the secondary velocities, which contribute to the development of more significant free-surface degradations as the spear and nozzle angles are increased result in a non-optimal jet runner interaction.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Fluids Engineering
Additional Information:
Copyright (c) 2018 by ASME
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1500/1507
Subjects:
ID Code:
130273
Deposited By:
Deposited On:
04 Jan 2019 13:15
Refereed?:
Yes
Published?:
Published
Last Modified:
16 Sep 2020 05:08