Table of Contents
Energies, Volume 9, Issue 4 (April 2016) – 85 articles
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Cover Story (view full-size image) Cavitation in hydro turbines occurs when the pressure falls sufficiently low in some regions of the [...] Read more. Cavitation in hydro turbines occurs when the pressure falls sufficiently low in some regions of the flow so that water vapor bubbles are formed. This is a complex phenomenon and can cause damaging effects such as vibration, blade surface erosion and performance loss. Despite the fact that crossflow turbines have been used in small-scale hydropower systems for a long time, cavitation has not been studied in these turbines. In this study, the first of its kind for crossflow turbines, we show that cavitation occurs in low-head crossflow hydro turbines. Cavitation inception was characterized using three-dimensional Reynolds-averaged Navier–Stokes computations with a homogeneous, free-surface two-phase flow model. It is demonstrated that cavitation occurs in the second stage of the turbine and was observed on the suction side near the inner edge of the blades. View the paper