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Research Papers

Computational Fluid Dynamics Investigation of a Novel Multiblade Wind Turbine in a Duct

[+] Author and Article Information
Jifeng Wang

Turbomachinery Lab,
Michigan State University,
East Lansing, MI 48824
e-mail: jwang94@illinois.edu

Janusz Piechna

Institute of Aeronautics and
Applied Mechanics,
Warsaw University of Technology,
Warsaw, Poland
e-mail: aerojp@o2.pl

Norbert Müller

Turbomachinery Lab,
Michigan State University,
East Lansing, MI48824
e-mail: mueller@egr.msu.edu

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received April 17, 2011; final manuscript received June 5, 2012; published online August 9, 2012. Assoc. Editor: Spyros Voutsinas.

J. Sol. Energy Eng 135(1), 011008 (Sep 08, 2012) (6 pages) Paper No: SOL-11-1128; doi: 10.1115/1.4007089 History: Received April 17, 2011; Revised June 05, 2012

A novel manufacturing approach similar to filament winding is able to produce high-performance and lightweight composite wheels. The production can be rapid, inexpensive, and utilize commercially available winding machines. One potential application of the wheel is as a wind turbine. It is widely accepted that placing a duct around a wind turbine can enhance its performance, especially when a new designed turbine with unique advantages has a relatively low power coefficient, it is necessary to examine the benefits and economics of a turbine in a duct. In this study, a numerical analysis of a ducted multiblade composite wind turbine using computational fluid dynamics (CFD) is evaluated and compared with a bare wind turbine of the same turbine area. This investigation was performed using FLUENT in conjunction with the GAMBIT meshing tool. The extracted power is calculated and compared for these two modeling designs. Through the comparison of power coefficient variation with thrust coefficient, it was found that a ducted turbine can be 2–3 times that of the power extracted by a bare turbine. The results of the analysis provide an insight into the aerodynamic design and operation of a ducted wind turbine in order to shorten the design period and improve its technical performance.

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References

Figures

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Fig. 1

Prototypes of composite material wheel

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Fig. 2

Ducted system nomenclature

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Fig. 3

Multiblade bare turbine and ducted turbine

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Fig. 4

3D meshing of the computational domain

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Fig. 5

Meshing refinement of the computational domain in turbine and diffuser

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Fig. 6

Static pressure (Pa) distribution on the bare turbine

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Fig. 7

Axial velocity (m/s) contour plot across the bare turbine in a free stream

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Fig. 8

Extracted power variation with rotating speed for a bare turbine

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Fig. 10

Axial velocity (m/s) contour plot on the ducted turbine in a free stream

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Fig. 9

Static pressure (Pa) distribution on the ducted turbine

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Fig. 11

Extracted power variation with tip speed ratio for a ducted turbine

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Fig. 12

Power coefficient CP for the bare and ducted turbine as a function of thrust coefficient CT

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Fig. 13

Streamline through turbine in open flow and ducted turbine

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Fig. 14

Flow path line diagram of ducted wind turbine

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