05748771 - Investigation on Performance Influence of...

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Investigation on Performance Influence of Maximum Thickness Position on Vertical Axis Wind Turbine Airfoil Jianjun Qu, Yi Mei, Mingwei Xu School of Mechatronics Engineering Harbin Institute of Technology Harbin, China qujianjun@hit.edu.cn, darrenymei@gmail.com, mingwei0090@126.com Abstract —Airfoil geometric configuration is very important for aerodynamic performance of a straight-bladed vertical axis wind turbine (SB-VAWT). In recent study, Islam et al have pointed out old NACA-4 are not perfectly suited for SB-VAWT operating at low Reynolds number and special purpose airfoils is needed. Islam has singled out four required geometric features which would be suitable for SB-VAWT airfoil. However, the maximum thickness position, considered one of the important geometric parameters, was not involved in Islam’s research. In this paper, NACA0015 airfoil was chosen as the basic airfoil, whose maximum thickness position was shifted to generate another four airfoils. With the approach of combining XFLR5 program and Viterna-Corrignan psot-stall mode, airfoil characteristics in attack angle range from 0 degree to 90 degree have been calculated. It has been found in this paper that, with the Reynolds number changing from 50,000 to 500,000, altering the maximum thickness position has varying degrees of affects on airfoil aerodynamic characteristics. The maximum thickness position should be involved in the SB-VAWT airfoil design, and the optimum maximum thickness position needs to be determined with the consideration of the Reynolds number range where the SB-VAWT operates. Keywords-vertical axis wind turbine; straight-bladed; VAWT; maximum thickness position; airfoil I. INTRODUCTION Wind energy, among all renewable energy, provides the most promising prospect. Entered into 21 st century, wind energy is increasingly important in national energy policy. According to the statistics, 10,000GW power can be generated by wind energy around the world, and the market share of wind energy systems boosts sharply, at a 32% annual growth rate. It is projected that there will be a huge increase in world wind power generation capacity over the coming years [1]. Wind turbines are primary devices to extract energy from wind, and horizontal axis wind turbine (HAWT) and vertical axis wind turbine (VAWT) are two main categories of modern turbine, separately. In comparison to vertical axis machine, horizontal axis turbine has been highly developed and emerged as the dominant commercial machine. Nevertheless, vertical axis wind turbine, especially straight-bladed vertical axis wind turbine (SB-VAWT), possesses a number of substantial advantages over HAWT, such as requiring no yaw mechanisms, blades with straight constant section, less noise during operation and easy maintenance as generating system placed on the ground. Due to these merits, SB-VAWT has gained more and more attentions recent years. Researchers from many universities and institutions have investigated in this kind of turbine [2].
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This note was uploaded on 11/13/2011 for the course AEE 495 taught by Professor O.uzol during the Spring '11 term at Middle East Technical University.

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05748771 - Investigation on Performance Influence of...

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