A Parametric Study about Blade Shapes and Blade Numbers of Water Wheel Type Tidal Turbine by Numerical Method

Nguyen, Manh Hung; Jeong, Haechang; Jhang, Sung-su; Kim, Bu-Gi; Yang, Chang-Jo

doi:10.7837/kosomes.2016.22.3.296

Cited by 7 publications

(1 citation statement)

References 3 publications

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“…The results showed that runners with no bottom plate had a better performance at high speeds because of receiving twice the amount of flow; meanwhile, no air bubbles were carried into the gap between the runners. In addition, Manh Hung Nguyen et al [20] compared the different performances with three blade shapes (straight, curved and the similar to Zuppinger type) through numerical experiments for stream wheels. The study demonstrated that straight blades with a simple construction had a better efficiency; in addition, the same conclusions were made by Emanuele Quaranta et al [15].…”

Section: Introductionmentioning

confidence: 99%

Performance Investigation of the Immersed Depth Effects on a Water Wheel Using Experimental and Numerical Analyses

Zhao

Zheng

Yang

et al. 2020

Water

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The purpose of this research is to study the effect of different immersed depths on water wheel performance and flow characteristics using numerical simulations. The results indicate that the simulation methods are consistent with experiments with a maximum error less than 5%. Under the same rotational speeds, the efficiency is much higher and the fluctuation amplitude of the torque is much smaller as the immersed radius ratio increases, and until an immersed radius ratio of 82.76%, the wheel shows the best performance, achieving a maximum efficiency of 18.05% at a tip-speed ratio (TSR) of 0.1984. The average difference in water level increases as the immersed radius ratio increases until 82.76%. The water area is much wider and the water volume fraction shows more intense change at the inlet stage at a deep immersed depth. At an immersed radius ratio of 82.76%, some air intrudes into the water at the inlet stage, coupled with a dramatic change in the water volume fraction that would make the flow more complex. Furthermore, eddies are found to gradually generate in a single flow channel nearly at the same time, except for an immersed depth of 1.2 m. However, eddies generate in two flow channels and can develop initial vortexes earlier than other cases because of the elevation of the upstream water level at an immersed radius ratio of 82.76%.

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Section: Introductionmentioning

confidence: 99%