Optimization Design Of Cantilever Oscillating Float Wave Energy Harvesting Device

The rapid development of human society has led to the depletion of fossil fuels.The problems of energy supply and energy and environment are becoming more and more serious.This has contributed to the development of renewable energy and the research work on the application of ocean wave energy conversion technology has made some achievements.The research on the wave energy trapping performance of the float,which is a primary energy capture device,has greatly affected the energy utilization efficiency and is a research key link in the technological progress of wave power generation in the future.The current research status and future trend of hydrodynamic performance of float,CFD technology are summarized.The technical advantages and research development of oscillating float wave power generation device are introduced.Based on CFD software FLOW-3D,the fluid-solid coupling numerical reservoir was modeled.The free surface was traced by the VOF method and the RNG k-? model was used to simulate the turbulence.Through a large number of simulation examples,the influence of grid parameters,boundary conditions and wave elimination methods on numerical wave-making effects are analyzed and compared.The optimal parameters of the numerical wave-groove model are obtained,and the ideal wave-making and wave-elimination effects are achieved.Based on the FLOW-3D software,the present study shows that the cone-shaped 120 ° cone-shaped conical wave energy capture device with the best hydrodynamic performance in the traditional oscillatory float shape under the condition of the overall oceanic wave conditions in our country has adopted the Froude similarity criterion I:20 numerical simulation of fluid-solid coupling of the shrinking model and wave to analyze the variation of flow field under the fluid-solid interaction of the wave floater.Combined with the theoretical analysis of the linear wave,the law of the movement of the water particle in the fluid-solid coupling wave and the wave velocity Field distribution of the vector cloud and get the wave and float coupling process of the float wave response to the movement.The theoretical calculation and simulation results are analyzed.The results show that the x-wave force is negative when the float is in heave motion.The velocity variation of the conical float does not coincide with that of the wave velocities.The fluid-Swirl generated to produce energy loss.Therefore,in view of the device problems and defects found in the above analysis,the cantilever ellipsoidal oscillating float device is improved and optimized based on the heave 120 °conical buoy,and the simulation results show that the device is superior to the conventional device Can capture the superiority of performance.Optimum design of the cantilever ellipsoidal oscillating float parameter model is achieved by setting a large number of simulation examples.The cantilevered ellipsoidal oscillating float device is reduced under the Froude similarity criterion to obtain the optimal size parameter R=0.25m,?=R/??0.091,the best feature size of prototype float is R=5m.Under the condition of wave height 0.1m and wave period 1.34s,the initial angle of the optimal float arm is ??37°,and the optimal device float average density and damping coeff1cient parameter combination ?=720kg/m3,?=103N·s/m.After optimization,the maximum power of single floats can reach P = 0.652W under the linear condition of H=0.1m and T=1.34m,and the wave-trapping efficiency can reach 0.51,Scaling power scales at similar scales,with an average maximum capture power of 23.326 × 103W for the prototype float.