Abstract A design and optimization procedure of simplified wind turbine rotors for small-scale applications is presented. The need for this research has arisen from the recent national initiative of the government of Sri Lanka titled ‘Battle for Wind Energy’ in promoting small scale grid connected wind plants for electricity customers under Net Metering scheme. The main objective of this research is to assist local developers to design optimum rotors for given electrical generators (as determined by customer requirements), suitable for wind characteristics at specific locations. Another objective is to enhance local manufacturing capabilities by providing a design option of a simplified rotor blade geometry. A study on the correlation between population density of electricity customers and wind energy potentials was carried out to categorize the demand centres based on wind energy potentials in proposing series of small-scale wind turbine designs. A unique and improved rotor design procedure is presented which attempts to match the point of maximum performance of a rotor (design tip speed ratio) with the design wind speed of a given location by considering generator performance. The new design procedure showed successful convergence on a unique blade diameter for each rotor configuration that allowed the design tip speed ratio to match the design wind speed. The performance evaluation of rotor designs showed that high solidity rotors work better on the low wind potential region while low solidity rotors dominate medium and high wind potential regions. The performance reductions of simplified rotor designs are not significant and therefore would be an effective way to enhance value addition through local manufacture. Problem statement • Lack of a rotor design procedure that considers generator performance. • Lack of a rotor design procedure for blades with an optimum simplified geometry. • Geographical mismatch between high resource sites and location of electricity consumers in Sri Lanka. • Lack of optimized small-scale wind turbine designs for sites with different wind potentials in Sri Lanka. • Limited opportunities for local manufacture in Sri Lanka. Major novel contributions • Identification of geographical locations most suitable for promoting small-scale wind turbines. • Creation of rotor design procedures for optimized and simplified blade geometries considering generator performance. • Creation of optimized and simplified wind turbine rotor designs for different wind potential regions in Sri Lanka.

中文翻译：

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针对斯里兰卡小规模应用的简化风力涡轮机转子的空气动力学建模

摘要 提出了一种用于小规模应用的简化风力涡轮机转子的设计和优化程序。这项研究的需要源于斯里兰卡政府最近发起的名为“风能之战”的国家倡议，旨在根据净计量计划为电力客户推广小型并网风力发电厂。这项研究的主要目标是帮助当地开发商为给定的发电机设计最佳转子（由客户要求确定），适合特定位置的风特性。另一个目标是通过提供简化转子叶片几何形状的设计选项来增强本地制造能力。对电力客户人口密度与风能潜力之间的相关性进行了研究，在提出一系列小型风力发电机设计时，根据风能潜力对需求中心进行分类。提出了一种独特且改进的转子设计程序，该程序试图通过考虑发电机性能将转子的最大性能点（设计叶尖速比）与给定位置的设计风速相匹配。新的设计程序表明，每个转子配置在独特的叶片直径上成功收敛，使设计叶尖速比与设计风速相匹配。转子设计的性能评估表明，高强度转子在低风势区域工作得更好，而低强度转子在中等和高风势区域占主导地位。简化转子设计的性能降低并不显着，因此将是通过本地制造提高附加值的有效方法。问题陈述 • 缺乏考虑发电机性能的转子设计程序。• 缺乏具有最佳简化几何形状的叶片转子设计程序。• 斯里兰卡高资源地点与电力消费者位置之间的地理不匹配。• 斯里兰卡缺乏针对不同风能场址的优化小型风力涡轮机设计。• 斯里兰卡本地制造机会有限。主要新贡献 • 确定最适合推广小型风力涡轮机的地理位置。• 考虑发电机性能，为优化和简化叶片几何形状创建转子设计程序。