Friction loss and energy recovery of a Pelton turbine for different spear positions

Title
Friction loss and energy recovery of a Pelton turbine for different spear positions
Authors
신유환박주훈전흥수최민석
Keywords
Pelton turbine; Injector; Friction loss; Head loss coefficient; PRO
Issue Date
2018-08
Publisher
Renewable energy
Citation
VOL 123-280
Abstract
This study is dedicated to find a cause of a critical flow rate in a Pelton turbine operating with a constant runner speed, below which the efficiency of the turbine decreases significantly. A critical flow rate was initially found in the performance test of the Pelton turbine for extracting energy from a PRO (pressure retarded osmosis) pilot plant. For higher flow rates than a critical value, the efficiency of the Pelton turbine was nearly constant independent of flow rates. For lower flow rates than a critical value, however, the efficiency drops with decreasing flow rates. 3D flow simulations were conducted at three different flow rates to investigate effects of flow rates on the performance of the Pelton turbine. It was found in the numerical results that a large friction loss is generated in an injector if the spear is closed too tightly for a low flow rate below a critical value. Head loss coefficients of the injector for three different spear positions were calculated and it was found that the loss is doubled below a critical flow rate. This implies that it is important to include the geometry of an injector and spear in the numerical simulations for Pelton turbines.
URI
http://pubs.kist.re.kr/handle/201004/67850
ISSN
0960-1481
Appears in Collections:
KIST Publication > Article
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