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Analysis of the Aerodynamic Behavior of Non-Conventional Airfoil Shapes Using Computational Fluid Dy

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Tutor: LiXueMin
School: Huazhong University of Science and Technology
Course: Fluid Machinery and Engineering
Keywords: flat-back airfoil,CFD,aerodynamic,XFOIL,wind energy
CLC: TM315
Type: Master's thesis
Year:  2013
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Abstract:
Wind energy is a clean, practical and economical energy alternative for a sustainablefuture of the world. Wind energy research includes wind conditions, wind turbinetechnology, wind energy integration as well as offshore deployment and operation. Theanalysis of aerodynamic behavior of non-conventional airfoil shapes belongs to theresearch of wind turbine technology.The objective of the work is to increase the bending resistance of wind turbine blades andmaintain high lift in their near-root region by employing a family of flat-back profiles. Theassessment of aerodynamic performance is based on Computational Fluid Dynamics(CFD).Initially a family of wind turbine profiles was achieved by an inverse method. For eachprofile, the lift and drag coefficients along with the angles of attack were obtained by afast code XFOIL. Then three selected and pretreated profiles were tested by an in-housecode, AIRFsst, developed by Center of Renewable Sources and Saving (CRES), Athens,Greece. The simulation achieved more accurate lift/drag coefficients and visualized theaerodynamic behaviors. It should be noted that the in-house code AIRFsst had beenvalidated before it tested the designed profiles. The validation process was conducted tothe same flat-back airfoil shape in Sandia National Laboratory in University of Californiaat Davis (UC-Davis).The research found that flat-back airfoil is a promising option to improve the structuralresistance while also making the aerodynamic performance acceptable. Moreover, thestudy suggested a family of wind profiles and a simple technique to transfer the currentwind profiles into flat-back shapes.
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