Author(s)

A. Lipej & M. Jamnik

Abstract

The paper presents numerical analysis of kinetic energy correction factor at the outlet of elbow penstock without and with butterfly valve for two different geometries. The butterfly valve inside the penstock is vertical. That is why 3-D calculation of turbulent flow is taking into account. The basic aim of this analysis is comparison of kinetic energy correction factor for different ge- ometries and its influence on the flow inside spiral casing. For numerical analysis two equation k — c turbulent model of FIDAP computer code has been used. Calculation was done on computer CONVEX 220. Introduction The main task of the flow analysis is to find out the influence of velocity profile on the turbine efficiency for two cases: with butterfly valve and without butterfly valve. The problem arose during an acceptance test

Keywords