Designing straight-bladed vertical axis wind turbine using the cascade theory

Islam, Mazharul and Amin, M. Ruhul and Carriveau, Rupp and Fartaj, Amir (2008) Designing straight-bladed vertical axis wind turbine using the cascade theory. In: 12th AIAA/ISSMO Multidisciplinary Analysis and Optimization Conference, 10th-12th September 2008, Victoria, British Columbia, Canada.

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Abstract

In this paper, a 1 kW straight-bladed vertical-axis Darrieus wind turbine is designed using the cascade theory. The effects of dynamic stall and flow curvature, in addition to solidity, design power coefficient, design tip speed ratio, design wind speed, cut-out speed, and blade supporting type (simple, overhang), have been considered. For the performance prediction of Darrieus turbines, especially for the local forces, there appear to be substantial differences between the measured and calculated values unless the dynamic stalling effect is included. For the high chord-radius ratio Darrieus wind turbines, the flow on the blade aerofoil appears to be of curvilinear nature and hence; it is also important to include the flow curvature effect. It has been discovered from the design analyses that the simple supported straight-bladed vertical-axis Darrieus wind turbine is less efficient than the overhang supported turbines. Unlike the other existing theories developed for performance prediction of straight-bladed vertical axis wind turbines, the Cascade Theory with dynamic stall and flow curvature effects does not create a convergence problem for any tip speed ratio and solidity. It has been observed from the design analysis that inclusion of the dynamic stall and flow curvature effects offers better prediction values for different design features, especially in the higher solidity ratios

Item Type:	Conference or Workshop Item (Plenary Papers)
Additional Information:	7416/56952
Uncontrolled Keywords:	Design; Forecasting; Optimization; Wind power; Wind turbines
Subjects:	T Technology > TJ Mechanical engineering and machinery
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering
Depositing User:	Dr. Mazharul Islam
Date Deposited:	23 May 2017 09:37
Last Modified:	23 May 2017 10:21
URI:	http://irep.iium.edu.my/id/eprint/56952

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