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 a three-dimensional simulation of flow around the three-bladed Darrieus turbine to investigate the turbine's self-starting power. Two types of straight and helical-bladed turbines, which are equipped with J-type blades are considered. The effects of various parameters including wind speed, blade height, and the tip shape of J-type blades which could be open or closed have been studied and compared with those of the turbine with conventional blade form. The flow analysis around the J-type blades determined that the vortices formed on the pressure raise 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 in the self-starting and low tip speed ratios. 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 tip speed ratios. 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.

Keywords

Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 56, Issue 3
2024
Pages 439-464

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