Abstract Most of the wind turbines analysis studies have been conducted under steady and uniform wind conditions. The unsteady flow past rotating rotor blades is, however, one of the most challenging applications for a numerical simulation. This is attributed to the existing aerodynamic complexities under such conditions. In this paper, a numerical approach to investigate the global dynamic behaviour of a Darrieus turbine under unsteady and non-uniform flow conditions is proposed. The dynamic response of Darrieus wind turbine geared system operating in fluctuating inflow present a more significant challenge for this approach. In this work, unsteady Computational Fluid Dynamic simulation is used to investigate the aerodynamic performance. Using the validated numerical model, unsteady wind inflow performance that affects the aerodynamic performance and the bevel gear dynamic response is conducted. The present results show that the dynamic behaviour of the Darrieus turbine geared system is strongly affected by the fluctuating inlet velocity. As such, a change in the inlet velocity results in the entire response changing in both the aerodynamic performance and the dynamic vibration of the studied wind turbine. The study results will hopefully be of importance to wind industries that require designs of VAWTs operating in unsteady winds condition.

中文翻译：

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Darrieus风力机齿轮传动系统非定常进风动态响应分析

摘要 大多数风力涡轮机分析研究是在稳定均匀的风力条件下进行的。然而，通过旋转转子叶片的不稳定流动是数值模拟最具挑战性的应用之一。这归因于在这种条件下现有的空气动力学复杂性。在本文中，提出了一种数值方法来研究在不稳定和非均匀流动条件下 Darrieus 涡轮机的全局动态行为。Darrieus 风力涡轮机齿轮系统在波动流入时运行的动态响应对这种方法提出了更重大的挑战。在这项工作中，非定常计算流体动力学模拟用于研究空气动力学性能。使用经过验证的数值模型，进行影响气动性能和锥齿轮动态响应的不稳定进风性能。目前的结果表明，Darrieus 涡轮齿轮系统的动态行为受入口速度波动的强烈影响。因此，入口速度的变化会导致所研究风力涡轮机的空气动力学性能和动态振动的整个响应发生变化。研究结果有望对需要在不稳定风条件下运行的 VAWT 设计的风电行业具有重要意义。入口速度的变化会导致所研究风力涡轮机的空气动力学性能和动态振动的整个响应发生变化。研究结果有望对需要在不稳定风条件下运行的 VAWT 设计的风电行业具有重要意义。入口速度的变化会导致所研究风力涡轮机的空气动力学性能和动态振动的整个响应发生变化。研究结果有望对需要在不稳定风条件下运行的 VAWT 设计的风电行业具有重要意义。