Loss Analysis for Pump-Turbine

Abstract

In order to clarify the distribution of hydraulic losses in a middle specific speed model pump-turbine, detailed measurements were conducted at runner outlet and each flow passage with two-dimensional LDV, high accuracy differential pressure transducers. Besides, it was made clear that the hydraulic loss between casing and guide vanes takes 50% to the total loss in pump operation. Moreover, it was confirmed that the method of loss analysis used in this study is entirely effective about the development of pump-turbine.