Wind energy has been an attractive renewable energy source, and in recent decades, highly efficient horizontal axis wind turbines have been developed and successfully deployed. However, alternative designs for wind energy conversion have also been proposed. In previous studies, a novel swing sail design for wind energy harvesting was proposed and analyzed. This turbine harvests energy by pitching a sail, causing a mast to swing, which in turn drives a flywheel in a rectified rotational motion. The rotating flywheel is then used to drive an electric generator. The designed turbine was originally semiactive, while in the present study, the fully passive version of the turbine was proposed, and its performance was examined. The turbine consists of an oscillating sail attached to a reciprocally moving mast via a torsion spring, and the wind-driven oscillatory motion is transformed into the rotational motion of a flywheel using a ratchet. Furthermore, a dry-friction dynamometer was utilized as a simple way of extracting energy. The dynamical equations of the turbine were derived and were used to analyze the time response of the turbine. In the model, the correlations for the aerodynamic lift and drag forces for a flat plate were utilized. The results were validated using the computation fluid dynamics (CFD) simulation. The effects of various dynamical and geometric parameters of the turbine on the generated power and the turbine performance were also investigated.

中文翻译：

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全被动摆动风帆风力机的建模与分析

风能一直是一种有吸引力的可再生能源，近几十年来，高效的水平轴风力涡轮机已被开发并成功部署。然而，也已经提出了用于风能转换的替代设计。在以前的研究中，提出并分析了一种用于风能收集的新型摆帆设计。该涡轮机通过摇动帆来收集能量，使桅杆摆动，进而驱动飞轮进行修正旋转运动。然后使用旋转的飞轮驱动发电机。设计的涡轮机最初是半主动的，而在本研究中，提出了涡轮机的完全被动版本，并检查了其性能。涡轮机由一个摆动帆组成，通过扭簧连接到往复运动的桅杆上，并且利用棘轮将风驱动的振荡运动转化为飞轮的旋转运动。此外，干摩擦测功机被用作提取能量的简单方法。推导出了涡轮的动力学方程，并用于分析涡轮的时间响应。在模型中，利用了平板的气动升力和阻力的相关性。使用计算流体动力学 (CFD) 模拟对结果进行了验证。还研究了涡轮机的各种动力学和几何参数对发电功率和涡轮机性能的影响。推导出了涡轮的动力学方程，并用于分析涡轮的时间响应。在模型中，利用了平板的气动升力和阻力的相关性。使用计算流体动力学 (CFD) 模拟对结果进行了验证。还研究了涡轮机的各种动力学和几何参数对发电功率和涡轮机性能的影响。推导出了涡轮的动力学方程，并用于分析涡轮的时间响应。在模型中，利用了平板的气动升力和阻力的相关性。使用计算流体动力学 (CFD) 模拟对结果进行了验证。还研究了涡轮机的各种动力学和几何参数对发电功率和涡轮机性能的影响。