Analysis Of Carrier Structure For Tidal Current Power Station And Research On Hydrodynamic Performance Test

As a kind of clear ocean energy,tidal energy is inexhaustible.In order to use and develop tidal energy fully,tidal energy power station carriers are being constructed equipped which can float in the sea with a power generating device.However,there is very large opening in the middle part of tidal energy power station carriers whose structures are serious discontinuity;when hydraulic turbine works,the surrounding flow field turns complicated;while floating in the sea,carrier is influenced by mooring system.Therefore,it is great important to calculate structural strength and preliminary understand the hydrodynamic characteristics of carriers in mooring system.In this paper,catamaran is used as power station support carrier,vertical axis turbine is used as the main power generation equipment,and the topic on the structural strength of the carrier of tidal current energy power station is studied,the hydrodynamic performance of the system is investigated by numerical simulation and model test:Firstly,the structural models of tidal energy power station carriers are created by software which the gravity of hull is simulated in shell and beam,other equipment of hull is loaded in the way of mass point.Basing on three-dimensional potential flow theory,wave loads are simulated by design wave method.A kind of equivalent design wave will be ensured,and the calculated stress can represents the worst condition when hull is floating in the sea actually.Secondly,loads of tidal energy power station carriers in actual working condition are analyzed: gravity load,hydrostatic and hydrodynamic loads,turbine load;when turbine rotates,the resulting force is converted into a force on the carrier by turbine which the force is bladed from turbine.The turbine loads and wave loads are loaded into the plant carrier in the form of combined conditions,obtaining yield strength results,and results will be comparatively analyzed.It reveals that hydraulic turbine loads have little influence in hull structural strength,however,when directions of wave and tidal current are identical,hydraulic turbine loads do great importance in hull structural strength.Main stress region centralizes in the place between connection bridge and well frame powered by hydraulic turbine,especially the corner of connection bridge and blocks.At last,in mooring state,the tidal power station system is the object of study,and model experiments are researched on the motion characteristics of carriers and mooring chains in uniform wave with different wave parameters while equipped with hydraulic and equipped without hydraulic.Motion characteristics of hull in the free state are checked in experiments,when experimental data is anastomosis to calculating data,experiments will be conducted researching on motion response of carriers in mooring state and dynamic characteristics of mooring line.Motion acceleration of swing and heave are mainly measured in different loading state and different wave parameters,and tensile strength of mooring cable NO.3 is also measured.The results are compared and analyzed.Motion accelerations of swing and heave with different wave parameters when hull is in different working conditions are measured in the experiments.The motion pattern of tidal power plant carrier under the action of wave and flow is obtained through comparative analysis of experimental results.