International Journal of Energy and Power Engineering

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Optimum Geometrical Shape Parameters for Conical Diffusers in Ducted Wind Turbines

Received: 3 October 2016    Accepted: 17 October 2016    Published: 9 November 2016
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Abstract

Encasing of wind turbines in ducts to increase wind energy extraction has been under study for several decades. Ducts are meant to accelerate the wind speed past the wind turbine rotor enclosed in the duct. The most common duct used in wind turbines is a diffuser. Wind speed augmentation in diffusers depends on the geometrical shape parameters of the diffuser, mainly the diffuser expansion angle and the non-dimensional length . This paper addresses wind speed augmentation by empty conical diffusers. It presents the dependence of the wind speed augmentation on the diffuser geometrical shape parameters and the optimum geometrical shape parameters for maximum wind speed augmentation. It is shown that for a given , wind speed augmentation increases with up to the maximum wind speed augmentation and starts to decrease. Each has a unique which gives the maximum wind speed augmentation. It has also been shown that the maximum wind speed augmentation increases with For wind speed increased from 1.48 m/s to 1.55 m/s.

DOI 10.11648/j.ijepe.20160506.11
Published in International Journal of Energy and Power Engineering (Volume 5, Issue 6, December 2016)
Page(s) 177-181
Creative Commons

This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.

Copyright

Copyright © The Author(s), 2024. Published by Science Publishing Group

Keywords

Wind Energy, Wind Speed Augmentation, Diffuser Geometrical Shape Parameters

References
[1] REN21. Renewables Global Status Report. (Paris: REN21 Secretariat), 2013.
[2] J. Roeth, Wind resource assessment handbook final report. NYSERDA Report 10-30. New York, 2010.
[3] G. M. Lilley and W. J. Rainbird, “A preliminary report on the design and performance of ducted windmills,” Technical report. C/T119, The British Electrical and Allied Industries Research Association, Great Britain, 1957.
[4] S. J. Watson, D. G. Infield, J. P. Barton, and S. J. Wylie, “Modelling of the performance of a building-mounte ducted wind turbine,” Journal of Physics: Conference Series, vol. 75, no. 1, Article ID 012001, 2007.
[5] F. M. White, “Fluid dynamics,” 7th edition. MacGraw-Hill, Newyork, 2009.
[6] B. Djebedjian, “Diffuser optimization using computational fluid dynamics and Micro- genetic algorithms,” Mansoura Engineering Journal, Vol. 28, no. 4, 2003.
[7] T. Matsushima, S. Takagi, and S. Muroyama, “Characteristics of a highly efficient propeller type small wind turbine with a diffuser,” Renewable Energy, Vol. 31, 2006, pp. 1343–1354.
[8] R. Chaker, M. Kardous, F. Aloui, and S. B. Nasrallah, “Relationship between open angle and aerodynamic performances of a DAWT,” The Fourth International Renewable Energy Congress, Sousse, Tunisia, December 20-22, 2012.
[9] M. M. Sarwar, N. Nawshin, M. A. Imam, and M. Mashud, “A new approach to improve the performance of an existing small wind turbine using diffuser,” International Journal of Engineering & Applied Sciences (IJEAS) Vol. 4, no. 1, 2012, pp. 31-42.
[10] R. A. Kishore, “Small-scale Wind Portable Turbine (SWEPT)”. MSc thesis, Virginia Polytechnic Institute and State University, Blacksburg, VA, 2013.
[11] F. Owis, M. T. S. Badaway, K. A. Abed, H. E. Fawaz and A. Elfeky, “Numerical investigation of loaded and unloaded diffuser equipped with a flange” International Journal of Scientific and Engineering Research, Vol. 6, No. 11, 2015, pp. 312-341.
[12] D. L. M. Barbosa, J. R. P. Vaz, S. W. O. Figueirido, M. E. Silva and A. L. A. Mesquita, “An investigation of a mathematical model for the internal velocity profile of conical diffusers applied to DAWTs” Anais da Academia Brasileira de Ciencias, Vol. 87, No. 2, 2015, pp. 1133-1148.
[13] S. H. Chang, Q. H. Lim and K. H. Lin, “Design of a wind energy capturing device for a vehicle” 2014 Fifth international Conference on Intelligent Systems, Modelling and Simulation, 27-29 Jan. 2014, pp. 435-440.
[14] S. A. H. Jafari and B. Kosasih, “Flow analysis of shrouded small wind turbine with a simple frustrum diffuser with computational fluid dynamics simulations” Jornal of Wind Engineering and Industrial Aerodynamics, Vol. 125, 2014, pp. 102-110.
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  • APA Style

    Peace-Maker Masukume, Golden Makaka, David Tinarwo. (2016). Optimum Geometrical Shape Parameters for Conical Diffusers in Ducted Wind Turbines. International Journal of Energy and Power Engineering, 5(6), 177-181. https://doi.org/10.11648/j.ijepe.20160506.11

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    ACS Style

    Peace-Maker Masukume; Golden Makaka; David Tinarwo. Optimum Geometrical Shape Parameters for Conical Diffusers in Ducted Wind Turbines. Int. J. Energy Power Eng. 2016, 5(6), 177-181. doi: 10.11648/j.ijepe.20160506.11

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    AMA Style

    Peace-Maker Masukume, Golden Makaka, David Tinarwo. Optimum Geometrical Shape Parameters for Conical Diffusers in Ducted Wind Turbines. Int J Energy Power Eng. 2016;5(6):177-181. doi: 10.11648/j.ijepe.20160506.11

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  • @article{10.11648/j.ijepe.20160506.11,
      author = {Peace-Maker Masukume and Golden Makaka and David Tinarwo},
      title = {Optimum Geometrical Shape Parameters for Conical Diffusers in Ducted Wind Turbines},
      journal = {International Journal of Energy and Power Engineering},
      volume = {5},
      number = {6},
      pages = {177-181},
      doi = {10.11648/j.ijepe.20160506.11},
      url = {https://doi.org/10.11648/j.ijepe.20160506.11},
      eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijepe.20160506.11},
      abstract = {Encasing of wind turbines in ducts to increase wind energy extraction has been under study for several decades. Ducts are meant to accelerate the wind speed past the wind turbine rotor enclosed in the duct. The most common duct used in wind turbines is a diffuser. Wind speed augmentation in diffusers depends on the geometrical shape parameters of the diffuser, mainly the diffuser expansion angle  and the non-dimensional length . This paper addresses wind speed augmentation by empty conical diffusers. It presents the dependence of the wind speed augmentation on the diffuser geometrical shape parameters and the optimum geometrical shape parameters for maximum wind speed augmentation. It is shown that for a given , wind speed augmentation increases with  up to the maximum wind speed augmentation and starts to decrease. Each  has a unique  which gives the maximum wind speed augmentation. It has also been shown that the maximum wind speed augmentation increases with  For  wind speed increased from 1.48 m/s to 1.55 m/s.},
     year = {2016}
    }
    

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    AU  - Peace-Maker Masukume
    AU  - Golden Makaka
    AU  - David Tinarwo
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    T2  - International Journal of Energy and Power Engineering
    JF  - International Journal of Energy and Power Engineering
    JO  - International Journal of Energy and Power Engineering
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    EP  - 181
    PB  - Science Publishing Group
    SN  - 2326-960X
    UR  - https://doi.org/10.11648/j.ijepe.20160506.11
    AB  - Encasing of wind turbines in ducts to increase wind energy extraction has been under study for several decades. Ducts are meant to accelerate the wind speed past the wind turbine rotor enclosed in the duct. The most common duct used in wind turbines is a diffuser. Wind speed augmentation in diffusers depends on the geometrical shape parameters of the diffuser, mainly the diffuser expansion angle  and the non-dimensional length . This paper addresses wind speed augmentation by empty conical diffusers. It presents the dependence of the wind speed augmentation on the diffuser geometrical shape parameters and the optimum geometrical shape parameters for maximum wind speed augmentation. It is shown that for a given , wind speed augmentation increases with  up to the maximum wind speed augmentation and starts to decrease. Each  has a unique  which gives the maximum wind speed augmentation. It has also been shown that the maximum wind speed augmentation increases with  For  wind speed increased from 1.48 m/s to 1.55 m/s.
    VL  - 5
    IS  - 6
    ER  - 

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Author Information
  • Department of Physics, University of Fort Hare, Alice, South Africa

  • Department of Physics, University of Fort Hare, Alice, South Africa

  • Deparment of Physics, University of Venda, Thohoyandou, South Africa

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