ABSTRACT

The fixed type foundation to support wind turbine in shallow water and floaters for medium to deep water depth, has been proposed in the literature. Among the floaters, semi-submersible floater has been shown promising with improved hydrodynamic response. In this study, the feasibility of semi-submersible type floater to support a vertical axis wind turbine (VAWT) has been investigated and presented. Experimental studies and numerical simulations were carried out on 3 and 4 column semi-submersible (1:75 Froude scale model) of the same displacement to assess the suitability and its hydrodynamic response in regular waves including the effect of wind turbine rotation. The damping characteristics of the floaters have been assessed using free decay tests as well as computational fluid dynamics simulations and compared. The hydrodynamic response of the floaters has been simulated using numerical simulations and the results obtained from numerical simulations were compared with that obtained from experiments. The suitability of prototype semi-submersible floaters (3-Column, and 4-Column) for supporting VAWT has been evaluated using the acceptable limits for west coast of India’s environmental conditions near Gujarat as a proposed for First Offshore Windfarm Project India (FOWPI).

摘要

文献中已经提出了在浅水中支撑风力涡轮机和中深水深度的浮子的固定式基础。在漂浮物中，半潜式漂浮物已被证明具有改善的水动力响应。在这项研究中，研究并提出了半潜式浮子支撑垂直轴风力涡轮机（VAWT）的可行性。对相同排量的 3 柱和 4 柱半潜式（1:75 Froude 比例模型）进行了实验研究和数值模拟，以评估其在常规波浪中的适用性及其水动力响应，包括风力涡轮机旋转的影响。浮子的阻尼特性已经使用自由衰减测试以及计算流体动力学模拟进行了评估和比较。浮子的水动力响应已经使用数值模拟进行了模拟，并将数值模拟的结果与实验获得的结果进行了比较。已使用印度西海岸古吉拉特邦附近环境条件的可接受限制评估了原型半潜式浮子（3 柱和 4 柱）用于支持 VAWT 的适用性，作为印度第一个海上风电场项目 (FOWPI) 的提议。