Wave energy is a highly promising renewable energy source.To promote the utilization of wave energy resources as well as develop new wave energy converters(WECs)with application prospects,a innovative elastic capsule oscillating water column(EC-OWC)WEC has been proposed and a physical experimental model has been established.Through expansion wave experiments,the expansion characteristics of the elastic capsule and the motion characteristics of the free expansion wave were studied.Through wave experiments,the hydrodynamic performance of the device coupled with waves,as well as the influence of waves and model parameters on the system oscillation and wave height amplification ratio were investigated.The results show that:as the water head difference inside and outside the device increases from 0 to 30 cm,the wave speed of the free expansion wave decreases from about 3.0 m/s to 1.9 m/s,which is consistent with the one-dimensional longitudinal wave theory;when the relative water depth is in the range of 0.064 4 to 0.078 2,the stabilized wave height amplification ratio almost exceeds 4,with the maximum reaching 6 at a relative water depth of 0.070 6;the wave height amplification ratio first increases and then decreases with the increases of relative water head,reaching a maximum of 6.5 at a relative water head of 6;the wave height amplification ratio reaches a maximum of 6.35 at a relative pipe length of 1.77.The results indicate that the one-dimensional longitudinal wave theory can provide support for the design of the elastic capsule;controlling the water head difference can effectively adjust the natural oscillation period of the device;when the oscillation periods inside and outside the device are matched,the system reaches near-resonance,and the expansion wave inside the capsule becomes a standing wave,and when the capsule length is close to half a wavelength,the wave height amplification ratio reaches a maximum.Through the preliminary hydrodynamic performance experiments on the EC-OWC model,the superior performance and resonance characteristics of the device are demonstrated,which can provide a reference for the development of such WECs.
维普
万方数据