The purpose of this paper is to investigate the influence mechanism of heave damping on the energy extraction of a fully passive oscillating hydrofoil in a turbulent environment. The effects of heave damping on the performance parameters and the shedding process of the leading-edge vorticity are studied. The results show that increasing heave damping will change the synchronization of heave motion and pitch motion, and then affect the formation and shedding process of the leading-edge vorticity. This leads to a reduction in the force and speed of the hydrofoil, and the final captured energy will decrease accordingly. In addition, some damping in heave is required by the fully passive oscillating hydrofoil to stabilize the amplitude of motion, thus avoiding excessive amplitude that may damage the structural integrity of the equipment.
Passive wave compensation (PHC) is widely used in offshore resource exploitation, with a series of advantages such as improved operating window. However, the structures which are in the splash zone will often be damaged. Appropriate PHC's system parameters can improve the compensation efficiency in specific sea conditions. In this paper, based on the theory of potential flow, the slamming force prediction model, the PHC system model and the coupling model are proposed. Through numerical simulation, the results show that: (1) PHC can also compensate the slamming force; (2) Impact of slamming force on compensation efficiency. Based on the numerical simulation and analysis,new ideas is provided for the selection of PHC's parameters.
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