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Research Papers: Alternative Energy Sources

Power Augmentation of Shrouded Wind Turbines in a Multirotor System

[+] Author and Article Information
Yuji Ohya

Professor
Research Institute for Applied Mechanics,
Kyushu University,
6-1 Kasuga-koen,
Kasuga 816-8580, Japan
e-mail: ohya@riam.kyushu-u.ac.jp

Jumpei Miyazaki

Research Institute for Applied Mechanics,
Kyushu University,
6-1 Kasuga-koen,
Kasuga 816-8580, Japan
e-mail: jumpei.miyazaki11@gmail.com

Uli Göltenbott

Research Institute for Applied Mechanics,
Kyushu University,
6-1 Kasuga-koen,
Kasuga 816-8580, Japan
e-mail: uli@riam.kyushu-u.ac.jp

Koichi Watanabe

Research Institute for Applied Mechanics,
Kyushu University,
6-1 Kasuga-koen,
Kasuga 816-8580, Japan
e-mail: koichi-watanabe@riam.kyushu-u.ac.jp

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received November 13, 2016; final manuscript received December 28, 2016; published online February 24, 2017. Assoc. Editor: Ryo Amano.

J. Energy Resour. Technol 139(5), 051202 (Feb 24, 2017) (12 pages) Paper No: JERT-16-1457; doi: 10.1115/1.4035754 History: Received November 13, 2016; Revised December 28, 2016

Diffuser-augmented wind turbines (DAWTs) can significantly increase the performance of the rotor. Multirotor systems (MRSs) have a lot of merits such as significant saving mass and overall cost of the wind turbine system. A MRS is defined as containing more than one rotor in a single structure. In the present research, DAWTs are studied in a MRS. In wind tunnel experiments, the power output and aerodynamics of two and three DAWTs placed in close vicinity, in side-by-side arrangements, have been investigated, along with circular disks and conventional wind turbines in the same configurations as the MRS. Results show a significant increase of up to 12% in total power output of the MRS with DAWTs compared to the sum of the stand-alone same turbines. The results can be explained by observing the bluff body flow phenomena in the wake interference around the multiple circular disks. Those flow phenomena are due to the accelerated gap flows and those biasing in the flow direction caused by the vortex interactions in the gap.

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References

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Figures

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Fig. 1

Boundary-layer wind tunnel, Kyushu University

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Fig. 2

Wind tunnel setup (top) and schematic of the dimensions of the WLT configuration in a SBS arrangement (bottom)

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Fig. 3

Schematic of the measurement system for the power output and the drag force (thrust force)

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Fig. 4

Procedure of measuring drag coefficients in each setup

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Fig. 5

Experimental setup (top) and variations in the drag force Cd for the two-disk configuration, compared to those for the stand-alone disk configuration (bottom)

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Fig. 6

Gap flow patterns related to variations in drag coefficient (±) for two SBS and three SBS configurations

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Fig. 7

Experimental setup (top) and variations in the drag force Cd for the three-circular disk configuration, compared to those for the stand-alone disk configuration (bottom)

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Fig. 8

Experimental setup (top) and variations in Cp and Cd for the configuration of two conventional turbines in SBS arrangement, compared to those for the stand-alone configuration (bottom)

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Fig. 9

Individual variations in Cpi (top) and Cdi (bottom) for two-conventional turbine configuration in SBS arrangement, compared to those for the stand-alone configuration

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Fig. 10

Power curves of a conventional turbine and a WLT with tip speed ratio λ

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Fig. 11

Experimental setup (top) and variations in Cp and Cd for the configuration of two WLTs in SBS arrangement, compared to those for the stand-alone configuration (bottom)

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Fig. 12

Individual variations in Cpi (top) and Cdi (bottom) for the two-WLT configuration in SBS arrangement, compared to those for the stand-alone configuration

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Fig. 13

Experimental setup (top) and variations in Cp and Cd for the configuration of three WLTs in SBS arrangement, compared to those for the stand-alone configuration (bottom)

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Fig. 14

Individual variations in Cpi (top) and Cdi (bottom) for three WLTs in SBS arrangement, compared to those for the stand-alone configuration

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