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http://dx.doi.org/10.3795/KSME-A.2017.41.3.225

Evaluation of Acceleration Effect of Ancillary Services on Cavitation and Fatigue of a Water Turbine in Pumped-Storage Plants  

Kim, Jong Sung (Dept. of Nuclear Engineering, Sejong Univ.)
Kim, Se Na (Yeosu Technical High School)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.41, no.3, 2017 , pp. 225-232 More about this Journal
Abstract
Several maintenance issues related to cavitation erosion and fatigue cracks in the water turbine subcomponents of pumped-storage plants, such as a runner and a draft tube, have been reported in the past. Generally, the pumped-storage plants provide ancillary services, such as black-start and system stabilization. The ancillary services are responsible for cyclic low opening operation of the guide vanes. It has been empirically established that this low opening operation further damages the water turbine subcomponents. In this study, the acceleration effect of the low opening operation on the cavitation erosion and fatigue of the water turbine is quantitatively assessed through finite element flow analysis, finite element stress analysis, and fatigue analysis. As a result of the assessment, it is identified that the cavitation potential increases and the turbine efficiency decreases with a decrease in the opening of the guide vane. Also, the low opening operation has an insignificant effect on the fatigue even though it increases the maximum stress values at the runner blade roots.
Keywords
Pumped-Storage Plant; Water Turbine; Runner; Guide Vane; Low Opening Operation; Ancillary Service; Cavitation; Fatigue; Finite Element Method;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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