Research On The Hydrodynamic Characteristics Of Double-floating Wave Energy Converter And Its Array

As an important component of ocean renewable energy,wave energy is clean,pollution-free,huge in reserve and potential in development,bringing light to solving the energy crisis and the environmental pollution.As an important structure of development and utilization of wave energy,the oscillating floater wave energy device is becoming research hotspot at home and abroad in recent years for its simple structure,higher energy conversion rate and wide frequency response range.The development of wave energy is moving from nearshore to open sea.Single-floating wave energy device can't meet the requirements,so oscillating double-floating wave energy device and arrays has been paid more and more attention.At present,domestic and international research on oscillating double-floating wave energy device and its array is less and programming and CFD methods,which is time-consuming,are more widely adopted.Therefore,this paper proposes the ANSYS-AQWA method to simulate the motion of the oscillating double-floating wave energy device,and realizes the motion simulation and performance analysis of the oscillating double-floating wave energy device and its array.This paper presents the relevant theory of the floating body,including micro-wave theory,frequency-domain calculation method,time-domain calculation method and the basic theory of multi-floating body flow field,and establishes the heave motion model of oscillating double-floating wave energy device.On this basis,the secondary development of AQWA software is done with Fortran language to consider the PTO effect,realizing the motion simulation of the oscillating double floating wave energy device and putting forward the ANSYS-AQWA calculation method,which is verified by the research and experiment of the double-floating wave energy device in NREL Lab.Aimed at a certain model of oscillating double-floating wave energy device,the ANSYS-AQWA calculation method is adopted to analyze the hydrodynamic performance of frequency domain and motion characteristics of time domain.Based on that,the effect of wave parameters(wave height,wave period),device parameters(diameter and draft of float,the diameter of the damping plate)and PTO parameters(damping coefficient and stiffness coefficient)on the power generation of the oscillating double-floating wave energy device is studied,which provides a reference for the related research and design.The power generation of the single oscillating double-floating energy device is limited.In order to adequately develop wave energy,it is inevitable that the array of the oscillating double-floating wave energy device will be tendency of future research.Based on the research of oscillating double-floating wave energy device,the influence factor of the array of wave energy device is introduced and the effect of arrangement spacing and wave direction on power generation is studied by ANSYS-AQWA method,which has certain reference significance for related research.