master tezi - 1 Numerical Modeling of Vertical Axis Wind...

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Unformatted text preview: - 1- Numerical Modeling of Vertical Axis Wind Turbine (VAWT) Master thesis Jianhui Zhang Supervisors: Associate Professor: WenZong Shen Professor:Jens Nørkaer Sørensen Assistant Professor : Robert Mikkelsen Fluid Mechanics , MEK TECHNICAL UNIVERSITY OF DENMARK DEPARTMENT OF MECHANICAL ENGINEERING 2004.12.20 - 2- Preface This report was a result of my master thesis in the Master of Wind Energy degree at Technical University of Denmark. The thesis work was started at July in 2004 and finished after six months. During this period, associate Professor Wen-Zhong Shen at Fluid Mechanics section in Department of Mechanical Engineering was attached as my supervisor. The assignment consists of analyzing pressure coefficient values for different airfoil at various angles of attack by numerical predictions and getting empiric formula. The master thesis as a whole is counting 30 credits. I would like to thank my supervisor, Wen-Zhong Shen for his continued guidance, support, and admirable patience during my project work. His experience and theoretical background were fundamentally important for my work described in this thesis. Without his encouragement and support this thesis would not have been completed in the allowable dime duration. I also thank Professor Jens Nørkaer Sørensen and assistant Professor Robert Mikkelsen for my research. - 3- Abstract The paper presents the ability of the flow solver XFOIL to predict pressure distribution in good agreement with EllipSys2D for airfoil section. It is the aim of the project to get the simple formula for pressure distribution as function at airfoils and angles of attack. Since it is difficult to analytically deduce the formula of the pressure distribution with thin-airfoil theory, we only deal with the data of the numerical predications from XFOIL code, and summarize the simple formula by TableCurve 2D. The studies are based on an aerodynamical model for two–dimensional flow fields. In the VAWT (vertical axis wind turbines), the airfoil revolves round the vertical axis. The numerical modeling of airfoil section is set up in two-dimensional flow fields, the blade force is calculated by pressure-distributed along the chord lines of (airfoil). In flow field a line with distribute force is used to instead of the airfoil section. The flow around the line is simulated with the CFD tool EllipSys2d to build up the pressure-field; the comparison between the flow around the line and experiment shows good agreement. The present methods can simplify the complex numerical modeling; it will be a good tool to analysis of the flow field around the VAWT rotors. Key Words: Pressure coefficient, Pressure distribution, XFOIL, EllipSys2D - 4- Contents 1 . I n t r o d u c t i o n 6 1.1 Motivation and Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .... .... 6 1.3 Methodology . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . .. . .. . ....
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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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master tezi - 1 Numerical Modeling of Vertical Axis Wind...

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