Author(s)

M. Makrantonaki, P. Prinos & A. Goulas

Abstract

Flow characteristics behind a butterfly valve M. Makrantonaki," P. Prinos,* A. Goulas' " Department of Agronomy, Faculty of Technological Science, University of Thessalia, Greece * Hydraulics Laboratory, Department of Civil Engineering, University of Thessaloniki, Thessaloniki, Macedonia, Greece * Fluid Mechanics Laboratory, Department of Mechanical Engineering, University of Thessaloniki, Thessaloniki, Macedonia, Greece ABSTRACT The characteristics of mean flow and turbulence behind a butterfly valve are studied experimentally using a Laser-Doppler anemometry. Velocity and turbulence intensity are measured at donstream locations 0.086D, 0.5D, ID and 2D (D = pipe diameter) for three valve angular positions corresponding to fully open, partly open and relatively closed positions. Comparison of the isovels for the three positions indicates flow patterns with quite distinct features. Levels of turbulence intensity may increase up to 150% of the mean velo

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