Numerical study of self-starting torque in Darius ‎vertical axis wind turbines with J-type blades ‎

Document Type : Research Article

Authors

Ph.D. Candidate, Mechanical Department, K. N. Toosi University of Technology, Tehran Iran

Abstract

The current study has used three-dimensional simulation of flow around the three-bladed Darrieus ‎turbine to investigate the turbine's self-starting power. Two types of straight bladed and helical bladed ‎turbines, which are equipped with a J-type blades are considered. To fully investigate, the effects of various ‎parameters including wind speed, blade height, and the tips shape of J-type blades which could be open or ‎closed have been studied and the results have been compared with those of the turbine with conventional ‎blades. The analysis of the flow around the J-type blades determined that the vortices formed on the ‎pressure side increase the pressure on this surface and thus rise the torque production. By closing the ends ‎of the J-type blade, these vortices are prevented from exiting at the ends that leads to a substantial ‎improvement on the self-starting and low TSR situations. The results showed that the average torque ‎produced by the straight and helical bladed turbines equipped with closed end J-type blades is respectively ‎‎38.5% and 21% higher than the turbines with full profile blades under self-start-up conditions, and the ‎aforementioned percentages are 49% and 41.9% at low TSRs. It was also concluded that the positive effect ‎of using J-type blades under self-starting conditions is more pronounced at low wind speeds and higher ‎blade heights, which makes these blades a viable option for urban applications.‎

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Amirkabir Journal of Mechanical Engineering
Volume 56, Issue 3
June 2024
Pages 6-6

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