CFD analysis of a gravitational whirlpool hydropower turbine at Egyptian riverine system.

Egyptian riverine networks are distributed from Upper Egypt to the Mediterranean Sea, Northern. Hydrokinetic energy uses the flowing water of the riverine systems such as rivers, canals, streams, dykes, and channels. According to the rural areas of Egypt where low flowing water velocity with ultra-low head of water exists at different regions, the gravitational water vortex turbine is one of the best options. In this study, artificially induced gravitational water vortex in the basin is investigated to extracts energy. Numerical model has simulated the gravitational water vortex turbine, after a sufficient sensitivity analysis with 6% error deviation. Several simulations have conducted and evaluated the required parameters and values. The results showed that the V-shaped basing and its inlet notch are directing the flowing current toward the basin circumference to its outlet hole, while increasing the current velocity that generates swirl. The maximum power coefficient of the runner is 0.34 achieved by 75 RPM and current velocity 1.6 m/s. Also, the lowest value is 0.12 occurred by 95 RPM and current of 3.1 m/s. Meanwhile, the highest thrust coefficient is 0.90 by current velocity of 3.1 m/s and 35 RPM, the lowest thrust coefficient is 0.24 by 1.6 m/s and 95 RPM. [ABSTRACT FROM AUTHOR]