Experimental test round of the DTU oscillating water column for the OES working group on wave energy modelling

We evaluate through experiments the hydrodynamic performance and power absorption of a model-scale oscillating water column (OWC) wave energy device. This particular oscillating water column deviates from a traditional one, through incorporation of a one-way exhaust valve. The motivation for this alteration, is to increase power absorption and decrease the cost of the air turbines used in the power take off system. In order to ensure that the OWC chamber is functioning reliably, we first validate the performance of the experiments using data from earlier test campaigns in previous works, before incorporating the one-way exhaust valve. Both upstroke and downstroke power absorption strategies are investigated. The one-way exhaust valve is constructed as a passive valve system for purposes of simplicity. However, there the simple passive-valve system used appears to have some leakage, which must be remedied in the future. The emphasis of this paper, on the other hand, is the relation between the internal chamber pressure and the volume flux through the orifice.