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A Study on Fluidic Diode for Wave Energy Conversion-Effect of Bypass Geometry on the turbine Performance

Open Journal of Fluid Dynamics 2020年第3期10卷 270-278页

作者： Keito Matsumoto Manabu Takao Shinya Okuhara Miah Md. Ashraful Alam Yoichi Kinoue National Institute of Technology Matsue College Matsue Japan Institute of Ocean Energy Saga University Saga Japan

A twin-impulse turbine for bi-directional flow has been developed for wave energy converter. However, the previous studies elucidated that the mean efficiency of the twin turbine is much lower than that of the impulse turbine for a unidirectional flow because a portion of airflow passes through the reverse flow turbine whose efficiency is very low. Therefore, a fluidic diode was adopted in the twin-impulse turbine in order to reduce the air flow through the reverse flow turbine. In this study, the rectification effect of the fluidic diode was investigated where a bypass is introduced into a blunt body. A computational fluid dynamics (CFD) analysis was conducted to investigate the effect of fluidic diodes on the turbine performance. In this analysis, RANS equations were used as the governing equations and the standard k-ε model was used as the turbulence model. The computational domain is composed of a circular tube and fluidic diode, and the domain meshed with an approximately 1.5 million mesh elements. As a result, it was found that the rectification effect of the fluidic diode is enhanced by installing a blunt body with a bypass hole of 5° taper angle.

关键词： Fluidic Diode Wave Energy Conversion twin-impulse turbine CFD Analysis

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