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標題: 小型垂直軸風力發電機流體驅動葉片運動電腦流體分析
The flow driven coupled motion analysis of wind turbine for small vertical axis wind turbine
作者: 羅宗義
Lo, Tsung-Yi
關鍵字: VAWT;垂直軸風力發電機;Flow Driven;Coupled Motion;流體驅動;藕合運動
出版社: 機械工程學系所
引用: [1]. Stix, Gary, "A Climate Repair Manual," Scientific American, September 2006, pg 46. [2]. [3]. Neeraj Mittal , Investigation of Performance Characteristics of a Novel VAWT, Department of Mechanical Engineering, University of Strathclyde,2001. [4]. Tony Burton, Wind energy handbook, JOHN WlLEY & SONS, LTD, 2001. [5]. J.F. Manwell, Wind energy explained, JOHN WlLEY & SONS, LTD, 2002. [6] Jianhui Zhang,Numerical Modeling of Vertical Axis Wind Turbine (VAWT), Department of Mechanical Engineering , Technical University of Denmark, 2004. [7]. R. A. Serway, J.W. Jewett. Jr, Physics for scientists and engineers with modern physics,6th ed, Thomson-Brooks/Cole, 2003. [8]. R.C.Hibbeler, Engineering mechanics Dynamics, 2th ed ,Prentice Hall,2002. [9]. I.H.Abbott, A.E. Von Doenhoff, Theory of wing sections, Dover,1959. [10]. [11]. Fluent 6.3, Documentation, User’s Guide, Fluent Inc, 2006. [12]. Fluent 6.3, Documentation, Tutorial Guide, Fluent Inc, 2006. [13]. Fluent 6.3, Documentation, UDF Manual, Fluent Inc, 2006. [14]. Xiao Hu, Dynamic Mesh Modeling, Documentation, Fluent Inc, 2006. [15]. 陳正和, 風力發電之應用和效益, 台電月刊, 2006, Vol. 527, pp. 30-36.
首先,吾人以一具有同軸、三翼式風力葉片的小型直立軸風力發電機為對象,其翼型為NACA4412(弧形翼型)及NACA0018(對稱翼型)等二維翼型,利用Fluent 軟體中的動態網格流體分析的技術,分析旋轉葉片繞著垂直軸旋轉作剛體運動時,周圍流域中之流場結構以及葉片受力特性。本文的研究發現如下:
2.無論在低風速(4m/s)或在高風速(12m/s) 的環境下,對稱翼型 (NACA0018)者在動能、扭矩的輸出性能(大約4倍)皆優於弧形翼型者(NACA4412)。換言之,對稱翼型比弧形翼型更適用於垂直軸型風力發電機(VAWT)。

This thesis studies the flow characteristics and output performance of a small vertical axis wind turbine (VAWT ) by way of numerical simulation. The CFD software, Fluent, is employed to analyze the flow characteristics around the rotating airfoils and the output torque for the specified VAWT. According to the results, the related output performance (instantaneous torque and the rotating kinetic energy) of the VAWT will be evaluated for the first step to design of a small VAWT.
We employ a small-sized vertical axis wind turbine with three blades rotating about a common axis. The blade cross section or airfoil is two-dimensional and in either a NACA4212 or a NACA 0018 profile. During the simulation, the dynamic mesh technique is adopted to investigate the deforming flow domain near the blades rotating about a common axis. The flow characteristics around the blade are analyzed and the instantaneous torque is output as the basis for the performance evaluation criteria. Some important findings are concluded as follows:
1. For the cambered blade (NACA4412), the blade mass of 0.41 density ratio generates more power than two other density ratios for the specified VAWT.
2. For either low (4 m/s) or high (12 m/s) wind speeds, the performance in terms of kinetic energy and the output torque is about 4 times higher for NACA0018 (symmetry) profile than NACA4412 (cambered). To implement in the small-sized VAWT, the symmetric blade profile is more suitable than the cambered blade profile.
其他識別: U0005-1808200806344600
Appears in Collections:機械工程學系所

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