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Research Papers: Alternative Energy Sources

Numerical and Experimental Study on Performance Enhancement of Darrieus Vertical Axis Wind Turbine With Wingtip Devices

[+] Author and Article Information
Nishant Mishra

Department of Mechanical Engineering,
Shiv Nadar University,
Gautam Buddha Nagar 201314,
Uttar Pradesh, India
e-mail: nishant.mishra@snu.edu.in

Anand Sagar Gupta

Department of Mechanical Engineering,
Shiv Nadar University,
Gautam Buddha Nagar 201314,
Uttar Pradesh, India
e-mail: as517@snu.edu.in

Jishnav Dawar

Department of Mechanical Engineering,
Shiv Nadar University,
Gautam Buddha Nagar 201314,
Uttar Pradesh, India
e-mail: jd332@snu.edu.in

Alok Kumar

Department of Mechanical Engineering,
Shiv Nadar University,
Gautam Buddha Nagar 201314,
Uttar Pradesh, India
e-mail: ak225@snu.edu.in

Santanu Mitra

Department of Mechanical Engineering,
Shiv Nadar University,
Gautam Buddha Nagar 201314,
Uttar Pradesh, India
e-mail: santanu.mitra@snu.edu.in

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received February 6, 2018; final manuscript received May 30, 2018; published online July 2, 2018. Assoc. Editor: Ryo Amano.

J. Energy Resour. Technol 140(12), 121201 (Jul 02, 2018) (7 pages) Paper No: JERT-18-1105; doi: 10.1115/1.4040506 History: Received February 06, 2018; Revised May 30, 2018

Darrieus type vertical axis wind turbines (VAWT) are being used commercially nowadays; however, they still need to improve in terms of performance as they work in an urban environment where the wind speeds are low and the gusts are frequent. The aerodynamic performance of Darrieus turbine is highly affected by the wingtip vortices. This paper attempts at analyzing and comparing the performance of Darrieus with the use of various wingtip devices. Attempts have also been made to find out optimal working parameters by studying the flow through turbines with different tip speed ratios and different inlet wind speeds. A comparative computational fluid dynamics (CFD) simulation was performed on a small-scale, straight-bladed Darrieus rotor vertical axis wind turbine, with a large stationary domain and a small rotating subdomain using sliding mesh technique. Comparison of the performance of end tip device that can be used against a baseline rotor configuration is done, with the aim of identifying the best tip architecture. The main focus lies on building an experimental setup to validate the results obtained with the CFD simulation and to compare the performance with and without wingtip device. VAWTs with wingtip device show very promising results compared to the baseline model.

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References

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Figures

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Fig. 1

Three-dimensional model of the turbine

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Fig. 2

Assembly of the wind turbine

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Fig. 3

Three-dimensional model of turbine with endplates

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Fig. 4

Velocity contours without endplates (top) and with endplates (bottom)

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Fig. 5

Vortex formation on blades with endplates (left) and without endplates (right)

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Fig. 6

Comparison of performance (Cp) of turbine with and without endplates

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Fig. 7

Comparison of performance of turbine (Cp) with Endplates of 15 mm and 25 mm offset

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Fig. 8

Turbine with endplates (25 mm offset)

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Fig. 9

Turbine with winglets (tilted at 45 deg)

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Fig. 10

Revolutions per minute and VIN comparison between base, endplates and winglets

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Fig. 11

Cp and TSR comparison between turbines with and without endplates

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Fig. 12

Cp and TSR comparison between CFD and experimental results

Tables

Errata

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