抄録
A twin impulse turbine that rectifies the reciprocating bi-directional airflow by two impulse type turbines without using a rectifier valve has been proposed as an air turbine for the oscillating water column (OWC) based wave energy conversion. However, a numerical analysis of the turbine performance in bi-directional airflow conducted in previous studies revealed that a portion of airflow passes through the turbine for reverse flow with a very low efficiency, and resulting the average efficiency of the turbine decreases markedly. Subsequently, the use of fluidic diodes has been proposed in some previous studies. In this study, the performance of the fluidic diode for the twin impulse turbine has been investigated by wind tunnel test. In addition, the flow in the fluid diode has been clarified by computational fluid dynamic (CFD) analysis.
