A Twin Impulse Turbine for Wave Energy Conversion -The Performance under Unsteady Airflow-

摘要

A twin unidirectional impulse turbine for wave energy conversion has been suggested in our previous study, and theperformance under unsteady flow has been investigated by quasi-steady analysis. In the present study, the performanceof twin impulse turbine under unsteady flow condition has been investigated by unsteady analysis of Computationalfluid dynamics. As a result, the mean efficiency of twin unidirectional impulse turbine under unsteady flow is lowerthan the maximum efficiency of unidirectional impulse turbine. Moreover, it is verified that airflow goes backward inthe reverse turbine in low flow rates.