Analysis of the energy-capturing characteristics of floats for point absorption wave energy generators

Abstract

In this study, based on four common float shapes, the factors affecting the energy-capturing characteristics of floats are determined using mathematical models of floats moving in waves. By using the orthogonal experimental method and AQWA hydrodynamics simulations, the influence degrees of different factors on the float capture width ratio were determined through the range analysis. Based on the frequency-domain conditions, the variation trends in the float energy-capturing characteristics are summarized, and the relationships between the float energy-capturing characteristics and the resonance frequency and wave force are discussed. It was concluded that the energy-capturing characteristics of slender cylindrical floats were better at the resonance frequency, and the wave force acting on the float is not the most powerful basis to judge the energy-capturing characteristics of the float. This study’s conclusions provide some reference for the design and optimization of floats. Graphical abstract In this study, the energy-capturing characteristics of floats in a point absorption wave energy generator under the action of multiple factors are studied. At a higher draft depth, a “slender” float shape had a larger capture width ratio. The wave force received by the float could not be the basis for determining the float energy-capturing characteristics.