Abstract
As a system using a conventional unidirectional air turbine in oscillating water column (OWC) based on a wave energy plant, a twin unidirectional impulse turbine topology has been suggested in previous studies. However, the average efficiency of the suggested twin turbine is considerably lower than that of a conventional unidirectional turbine in this topology because reciprocating air flow can’t be rectified adequately by a unidirectional turbine. In order to improve the efficiency, using fluidic diode is discussed. In this study, two different fluidic diodes were discussed by computational fluid dynamics (CFD) and a wind tunnel test. Further, its usefulness is discussed from a view point of the turbine efficiency. The fluidic diode was shown to improve rectification of the topology. However, it needs more improvement in regards to its energy loss in order to enhance the turbine efficiency.
Highlights
As an air turbine equipped with oscillating water column (OWC) based wave energy plant, a rectification-valve system using a conventional unidirectional turbine has been invented
A twin unidirectional impulse turbine topology has been suggested in previous studies in order to use conventional unidirectional turbines without a rectification valve [1] [2]
The effect of the fluidic diodes on the performance of twin unidirectional impulse turbine topology was discussed by using computational fluid dynamics (CFD) and wind tunnel testing
Summary
As an air turbine equipped with oscillating water column (OWC) based wave energy plant, a rectification-valve system using a conventional unidirectional turbine has been invented. This system has problems with the durability of the valves and the complexity of the mechanism. (2014) A Twin Unidirectional Impulse Turbine for Wave Energy Conversion—Effect of Fluidic Diode on the Performance. A twin unidirectional impulse turbine topology has been suggested in previous studies in order to use conventional unidirectional turbines without a rectification valve [1] [2]. The cause of the low efficiency is that part of the air flow gets through the unidirectional impulse turbine in the direction of low efficiency [1]
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