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ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2007, Vol. 8 Issue (9): 1414-1421    DOI: 10.1631/jzus.2007.A1414
Civil Engineering & Mechanics     
Numerical investigation on the flow and power of small-sized multi-bladed straight Darrieus wind turbine
JIANG Zhi-chao, DOI Yasuaki, ZHANG Shu-you
College of Mechanical and Energy Engineering, Zhejiang University, Hangzhou 310027, China; Hangshen Holding Group Co., Ltd, Hangzhou 311234, China; Graduate School of Engineering, Hiroshima University, Higashi-hiroshima, Hiroshima 739-8527, Japan
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Abstract  Straight Darrieus wind turbine has attractive characteristics such as the ability to accept wind from random direction and easy installation and maintenance. But its aerodynamic performance is very complicated, especially for the existence of dynamic stall. How to get better aerodynamic performance arouses lots of interests in the design procedure of a straight Darrieus wind turbine. In this paper, mainly the effects of number of blades and tip speed ratio are discussed. Based on the numerical investigation, an assumed asymmetric straight Darrieus wind turbine is proposed to improve the averaged power coefficient. As to the numerical method, the flow around the turbine is simulated by solving the 2D unsteady Navier-Stokes equation combined with continuous equation. The time marching method on a body-fitted coordinate system based on MAC (Marker-and-Cell) method is used. O-type grid is generated for the whole calculation domain. The characteristics of tangential and normal force are discussed related with dynamic stall of the blade. Averaged power coefficient per period of rotating is calculated to evaluate the eligibility of the turbine.

Key words： Small-sized      Straight Darrieus wind turbine      Multi-bladed      Power coefficient     
Received: 17 January 2007     
CLC:  TK83  
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JIANG Zhi-chao
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JIANG Zhi-chao, DOI Yasuaki, ZHANG Shu-you. Numerical investigation on the flow and power of small-sized multi-bladed straight Darrieus wind turbine. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2007, 8(9): 1414-1421.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.2007.A1414     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2007/V8/I9/1414

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