Theoretical method of selecting number of buckets for the design and verification of a Pelton turbine

Title
Theoretical method of selecting number of buckets for the design and verification of a Pelton turbine
Authors
신유환박주훈김정원조인찬정진택
Keywords
Angle of attack; Pelton turbine; hydraulic machinery design; speed ratio; hydraulics of renewable energy systems; laboratory studies; number of buckets
Issue Date
2017-09
Publisher
Journal of hydraulic research: Journal de recherches hydrauliques
Citation
VOL 55, NO 5-1354933-11
Abstract
In this study, we develop a theoretical formula for determining the optimum number of buckets required for achieving the maximum possible efficiency of a Pelton turbine. In addition, by deriving an improved formula for determining the speed ratio limit at which a missing jet begins, we obtain a valid condition for the selection of the number of buckets. To validate these formulas, we conduct a performance test on a pico-scale Pelton turbine by using runners with different numbers of buckets. The results of the performance test validate both the formula for bucket selection, by confirming that the calculated number of buckets maximizes the efficiency of the Pelton turbine, and the formula for the speed ratio limit.We conduct an additional performance test on a micro-scale Pelton turbine, the results of which also verify the formula for selecting the number of buckets. This study should help researchers determine the appropriate number of buckets when designing a highly efficient Pelton turbine.
URI
http://pubs.kist.re.kr/handle/201004/66126
ISSN
0022-1686
Appears in Collections:
KIST Publication > Article
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