Study On The Design And Optimization Of The Breakwater Energy Capture Chamber With The Function Of Wave Energy Generation

As one of the most widely used wave energy conversion devices,the development and utilization of oscillating water column(OWC)wave energy generator have been paid more and more attention.By converting wave energy into the kinetic energy needed for power generation,the wave energy conversion devices reduce the energy of the wave and absorb waves as breakwater does.Therefore,the vertical caisson breakwater and the OWC-type wave energy generating device can be integrated into the shore-based breakwater system with the function of wave power generation,which will generate power and absorb waves synchronously.In this paper,the U-OWC wave energy device embedded in the vertical breakwater is studied.The physical model test and numerical simulation are applied to investigate the factors influencing the hydrodynamic performance of the energy-capture chamber of the wave energy device.The influence factors including the inclination angle of front wall,the shape of inner bottom,the diameter of aeration hole,the nonlinearity of wave,and draught of U-OWC wave energy device are studied to optimize the structure of air chamber and improve the efficiency of wave energy conversion.The results will provide the theoretical reference for the design of the breakwater integrated with the wave power generation device.The following research is carried out in detail:The current research situation of wave energy device at home and abroad,including the research status of technology and hydrodynamics.The basic CFD theory which the software used in this paper was given.The CFD model for simulating OWC wave energy was established.The accuracy of the numerical wave flume was verified by comparing the numerical model results with the analytical solution.Compared with the published experimental data,the accuracy of the wave flume proposed in the simulation process of the OWC wave energy plant was verified in this paper.The physical model test was conducted baesd on the air chamber structure of the integrated device proposed in this paper.The factors affecting the efficiency of the wave energy conversion and the reflection coefficient of the U-OWC were studied based on the test.In this paper,the hydrodynamic performance of the U-OWC with a typical front wall inclination 45° under different wave elements were investigated to verify the influence of draught depth,nonlinear wave surface,air hole diameter.etc on the efficiency of wave energy conversion and test the hydrodynamic performance of the device.Based on the established numerical model,the hydrodynamic performance of U-OWC was discussed.The influence of different factors,including air chamber shape and wave elements,on the relative wave height in the gas chamber of the U-OWC was expounded to obtain the optimal structure of U-OWC under different working condition.The accuracy and reliability of the numerical model were further verified by comparing the physical model test data and the numerical simulation data.