Study On Hydrodynamic Performance Of Oscillating Blade Wave Energy Converters

In today's energy consumption structure,the proportion of traditional energy is too high,and according to the current energy consumption structure continues to consume,there will be a shortages of energy in the future.At the same time,over-exploitation and utilization of traditional energy sources will lead to the deterioration of the ecological environment,and the issue of energy security and ecological environment will attract more and more attention.Wave energy is the most potential form of energy in ocean energy at the present stage.It is of great significance to carry out research on ocean energy utilization to alleviate energy shortage and improve ecological environment.Oscillating-blade wave power generation device has the characteristics of simple structure and double-stroke work,research and development must be carried out on the hydrodynamic performance.Research on the hydrodynamic performance of oscillating blade wave energy converter can enhance the power generation capacity and capture width ratios of the converter,which is the key to facilitating device application.The main research work of this paper includes:Firstly,the composition of the converter and the principle of its energy conversion are explained.Based on the theory of linear wave theory,the structure of wave induced load on the blade was analyzed by wave mechanics,and then the inertia force and drag force of the wave acting on the blade are calculated respectively.The wave load acting on the drive shaft was calculated and the capture width ratio formula of blade was deduced.Secondly,the numerical wave pool is established by finite element method,and the influence of wave parameters and device parameters on the hydrodynamic performance of the device is studied by means of power generation device and numerical wave coupling method.The results show that the hydrodynamic performance of the device increases when the wave height increases.The parameters of period and swing angle have great influence on the performance of the device,too large or too small to improve the hydrodynamic performance of the device.In one wavelength,the hydrodynamic performance of the device is better when the oscillating blade increases,and the hydrodynamic performance of the device decreases with the increase of immersion depth.Finally,Establishment of experimental model of equipment based on similarity criterion,and the relative motion principle was used by using the alternative method to simulate the wave height and period.The physical model tests were carried out on the interaction between the oscillating blades and the waves,and the influence of the wave height,the period,the swing angle and the size of the oscillating blades on the hydrodynamic performance of the oscillating blades wave energy converter was analyzed.The simulation results were qualitatively compared with the experimental results,and the correctness of the simulation results was verified.