Hydrodynamic Performance Of A Ring Array Of Wave Energy Converters Based On Column Carrier

Traditional fossil energy is increasingly depleted,and the development and utilization of renewable energy has become the trend of energy applications today.Compared with other energy sources,wave energy has the advantages of wide distribution,renewable energy,and high energy flow density.Therefore,it has been highly valued and has developed rapidly in recent years.This paper proposes a new column-annular array wave energy power generation device integrated system.Because the annular array wave energy device has anti-wave function,it can reduce the impact of waves on the column and improve the survivability of the column.It has important engineering significance and broad applications.Based on the theory of linear potential flow in the frequency domain,this paper first establishes a hydrodynamic model of the heave motion of a circular array wave energy device distributed around a fixed column.Combining the actual sea conditions of a certain sea area in China and the dimensionless natural frequencies of the float corresponding to different diameter draught ratios,design a suitable size float,use the open source code Nemoh to solve the interaction between the wave and the floating body,and obtain the wave excitation force and the floating body's vibration force.Hydrodynamic coefficient,further obtain the optimal damping of the float at different frequencies,and analyze its motion response and wave energy capture power under the optimal damping.Then the optimal damping of a single float is used as the fixed damping of the array floats,and the overall performance and the hydrodynamic characteristics of the floats at different positions are analyzed.When combined with the column,the overall influence of the column on the annular array device and the influence of the wave energy capture of the float at different positions are also considered.Then,based on the directional spectrum function,the multi-directional irregular wave is simulated,and the calculation model of the interaction between the multi-directional irregular wave and the annular array wave energy device arranged around a column is established.The influence of the directional distribution concentration parameter on the energy capture characteristics of the annular array wave energy device under the influence of the column is studied,and the hydrodynamic characteristics of the floats in the array are further analyzed.Finally,based on the catenary theory,the equivalent matrix and force of the mooring system are analyzed.The calculated mooring equivalent stiffness matrix and Newton Euler equations are used to solve the multi-constraint coupled motion model of the column-annular array wave energy device integrated system.The focus is on the influence of the addition of the annular array wave energy device on the movement of the column,and the overall performance of the array device and the hydrodynamic characteristics of the float at each position under the coupled movement are further analyzed.The results show that the influence of the column on the wave energy capture characteristics of the annular array wave energy device is mainly reflected in the low frequency region,and the positive effect between the floats is more obvious.Under the action of multidirectional irregular waves,the wave energy capture efficiency and power of the array wave energy device are significantly reduced.The difference in the average interaction factor between regular waves and multidirectional irregular waves is mainly reflected in the high frequency region.The column-annular array wave energy device coupling integrated system makes the movement response of the column generally show a downward trend,and promotes the absorption of the wave energy of the floats at each position of the array wave energy device.