An Oscillating Water Column Type Wave Energy Power Generation Device Based On A Breakwater Hydrodynamic Study Of The Turbine

Energy is the most basic driving force for world development and economic growth,and the basis for human survival.Due to environmental pollution,climate change and the decline of traditional energy sources,people are increasingly interested in renewable energy.Among them,wave energy has attracted a large number of researchers because of its large reserves,high energy density and wide distribution.Among many wave energy conversion devices,Oscillating Water Column(OWC)device has been favored by scholars because of its advantages of high structural stability,strong environmental adaptability and easy integrated arrangement.However,low cost effectiveness greatly hinders the popularization and application of OWC devices.Integrating OWC with Marine structures is an effective means to enhance its economic competitiveness:(1)This thesis introduces the research background and significance of this topic,and focuses on the development status of OWC device and OWC type oscillating water column as well as the research methods and progress of dynamic performance.(2)STAR-CCM+,a commercial computational fluid dynamics(CFD)software,was used to build a value pool model.Grid verification was carried out in the numerical pool model,and motion response verification of OWC device system under different time steps was carried out in the numerical pool model.(3)According to the hydrodynamic performance and structural characteristics of OWC device,design and optimize the OWC device with the best PTO damping and draft depth.(4)Study the hydrodynamic performance of third-order waves on breakwater.The motion response of the third order effect of the wave is analyzed under the condition of 2%wave steepness and 4% wave steepness.Meanwhile,the focusing effect of the breakwater is studied by Fourier analysis method.(5)Study the combination of oscillating water column(OWC)and breakwater structure to optimize hydrodynamic performance under the condition that OWC device and breakwater device are combined.By changing the Angle between the breakwater and the wall,and by analyzing the wave oscillation coefficient and pressure fluctuation coefficient inside the OWC device as well as the force of the breakwater,the influence of structural change on the comprehensive performance of the oscillating water column is studied.It is found that the numerical model built by commercial computational fluid dynamics(CFD)software STAR-CCM+ has the reliability of numerical simulation.The optimization of PTO damping and draft depth can improve the hydrodynamic performance of oscillating water column system.Under the condition that OWC device and breakwater device are combined,the simulation results from the wave energy conversion efficiency and the force value of the plate show that the OWC oscillating water column breakwater can not only improve the wave energy conversion efficiency in the OWC oscillating water column but also reduce the force size of the breakwater.In addition,changing the Angle between the breakwater and the wall can improve the hydrodynamic performance of the oscillating water column breakwater.