Design Of Flow-induced Vibration Generator And Numerical Analysis Of Generating Power

As a kind of marine,renewable energy,tidal current has attracted much attention because of its advantages such as good stability,wide range of existence and high energy density.At present,the main tidal current generation equipment is all kinds of hydro-generator,but the turbine can not work at low flow rate.Therefore,it is necessary to develop generating devices that can capture low velocity tidal current energy.VIVACE a new power generation device,converts low-velocity water into electricity.But VIVACE is only a model experimental device,and the real water has a more complex underwater environment than the laboratory.How to use fluid-induced vibration to effectively generate electricity in real water area is the focus of this paper.Based on the power generation principle of VIVACE,the design and research of real scale fluid induced vibration power generation device in real water area are carried out in this paper..In order to study the influence law of different influence parameters of fluid-induced vibration on the power and efficiency of power generation device,based on VIVACE,an experimental model of fluid-induced vibration power generation device suitable for Harbin Engineering University laboratory is designed in this paper,and the relevant experimental research is completed.By analyzing and sorting out the experimental data,the parameter values of the fluid-induced vibration generator at the optimum power and efficiency are obtained.Based on the experimental parameters,the design of the full-scale cylindrical oscillator is completed by using the similarity theory.Based on the open source software Open FOAM,the numerical simulation of the flow induced vibration of the cylinder vibrator in the experimental device and the full-scale cylinder vibrator is completed.By comparing the experimental results with the numerical simulation results,it is found that the variation of the power and efficiency of the real scale fluid-induced vibration generator with the flow velocity is basically consistent with the experimental results.It is proved that the real scale flow induced vibration generator can effectively generate electricity in the actual river basin.In view of various environmental problems in the actual river basin,combined with the requirements of external environment when the flow induced vibration power generation device works stably,the design of two general schemes of seated positioning installation and floating positioning installation of power generation device is completed.The two schemes are suitable for different water depths.The sit-down scheme sinks to the bottom by its own gravity and its height and direction can be adjusted.The sitting-bottom solution is simple to locate and install and has low cost,but is only suitable for shallow water.The floating scheme adopts semi-submersible main floating body structure and tension leg mooring,which has better motion performance and wide range of applicable water depth.