Dynamic Response of a Spar Wind-current Energy System Influenced by Hydroturbine Installation Position
In order to investigate the influence of hydroturbine installation position on the dynamics char-acteristics of the Spar integrated wind-current energy system,this paper established a fully coupling aero-dynamic-hydraulic-servo-elastic simulation model of Spar integrated wind-current energy system based on the open-source software OpenFAST and the commercial software AQWA.Using blade element momen-tum theory,modal analysis and diffraction-radiation theory,the platform motion,system output power and mooring tensions were calculated for the cases in which the hydroturbines were installed at 70 m,80 m,90 m,100 m and 110 m below the mean sea level,respectively.The simulation results were ana-lyzed and compared with the calculation results without hydroturbine.The results show that when the hydroturbines are installed at 110 m below the mean sea level,the mean value of the platform pitch is re-duced by 11.57%compared with the results in the case without hydroturbines.The output power of the system increases by 10.15%,indicating that the Spar integrated wind-current energy system is not only capable of improving the power output,but also of enhancing the operational stability of the system.
wind-current energy systemSpar platformwind turbinehydroturbine
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