IDEAS home Printed from https://ideas.repec.org/a/eee/renene/v126y2018icp969-977.html
   My bibliography  Save this article

Effect of the diffuser efficiency on wind turbine performance

Author

Listed:
  • Vaz, Jerson R.P.
  • Wood, David H.

Abstract

A diffuser surrounding a rotor is able to increase the power coefficient of a wind turbine above the Betz-Joukowsky limit (16/27), and so has attracted great attention for many years. This work presents a novel analysis of the performance of diffuser-augmented wind turbines (DAWTs) taking into account the influence of the diffuser efficiency and thrust, in which a new formulation for the far-wake velocity is proposed. The mathematical model extends Blade Element Theory to include the diffuser efficiency in the axial velocity formulation, which in turn, modifies the thrust and power. Additionally, a correction for high rotor thrust is presented, where a quadratic equation is used to incorporate the losses within the diffuser that are associated with the efficiency being less than 100%. An algorithm to assess DAWT performance was developed and implemented. The new model was validated by comparison with experimental data match and shows good agreement when a diffuser efficiency of 80% is assumed. The impact of the diffuser is assessed by the augmentation factor, the ratio of turbine efficiency to the Betz-Joukowsky limit. It is shown, for example, that the augmentation factor exceeds unity only for efficiency greater than 74% when the diffuser thrust is 0.2 of the total thrust and ratio of the rotor area to diffuser exit area is 0.54.

Suggested Citation

  • Vaz, Jerson R.P. & Wood, David H., 2018. "Effect of the diffuser efficiency on wind turbine performance," Renewable Energy, Elsevier, vol. 126(C), pages 969-977.
    • Handle: RePEc:eee:renene:v:126:y:2018:i:c:p:969-977
    DOI: 10.1016/j.renene.2018.04.013
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0960148118304208
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.renene.2018.04.013?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    as
    1. Sorribes-Palmer, F. & Sanz-Andres, A. & Ayuso, L. & Sant, R. & Franchini, S., 2017. "Mixed CFD-1D wind turbine diffuser design optimization," Renewable Energy, Elsevier, vol. 105(C), pages 386-399.
    2. Bontempo, R. & Manna, M., 2016. "Effects of the duct thrust on the performance of ducted wind turbines," Energy, Elsevier, vol. 99(C), pages 274-287.
    3. Kosasih, B. & Saleh Hudin, H., 2016. "Influence of inflow turbulence intensity on the performance of bare and diffuser-augmented micro wind turbine model," Renewable Energy, Elsevier, vol. 87(P1), pages 154-167.
    4. Wang, Wen-Xue & Matsubara, Terutake & Hu, Junfeng & Odahara, Satoru & Nagai, Tomoyuki & Karasutani, Takashi & Ohya, Yuji, 2015. "Experimental investigation into the influence of the flanged diffuser on the dynamic behavior of CFRP blade of a shrouded wind turbine," Renewable Energy, Elsevier, vol. 78(C), pages 386-397.
    5. Yuji Ohya & Takashi Karasudani, 2010. "A Shrouded Wind Turbine Generating High Output Power with Wind-lens Technology," Energies, MDPI, vol. 3(4), pages 1-16, March.
    6. Wood, D.H. & Okulov, V.L., 2017. "Nonlinear blade element-momentum analysis of Betz-Goldstein rotors," Renewable Energy, Elsevier, vol. 107(C), pages 542-549.
    7. Bontempo, R. & Manna, M., 2014. "Performance analysis of open and ducted wind turbines," Applied Energy, Elsevier, vol. 136(C), pages 405-416.
    Full references (including those not matched with items on IDEAS)

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Miriam L. A. Gemaque & Jerson R. P. Vaz & Osvaldo R. Saavedra, 2022. "Optimization of Hydrokinetic Swept Blades," Sustainability, MDPI, vol. 14(21), pages 1-13, October.
    2. Janesh N. Mohanan & Kumaravel Sundaramoorthy & Ashok Sankaran, 2021. "Performance Improvement of a Low-Power Wind Turbine Using Conical Sections," Energies, MDPI, vol. 14(17), pages 1-21, August.
    3. Chong, Wen-Tong & Muzammil, Wan Khairul & Ong, Hwai-Chyuan & Sopian, Kamaruzzaman & Gwani, Mohammed & Fazlizan, Ahmad & Poh, Sin-Chew, 2019. "Performance analysis of the deflector integrated cross axis wind turbine," Renewable Energy, Elsevier, vol. 138(C), pages 675-690.
    4. Ye, Jianjun & Cheng, Yanglin & Xie, Junlong & Huang, Xiaohong & Zhang, Yuan & Hu, Siyao & Salem, Shehab & Wu, Jiejun, 2020. "Effects of divergent angle on the flow behaviors in low speed wind accelerating ducts," Renewable Energy, Elsevier, vol. 152(C), pages 1292-1301.
    5. Shahzad Ali, Qazi & Kim, Man-Hoe, 2022. "Quantifying impacts of shell augmentation on power output of airborne wind energy system at elevated heights," Energy, Elsevier, vol. 239(PA).
    6. Vaz, Jerson R.P. & Okulov, Valery L. & Wood, David H., 2021. "Finite blade functions and blade element optimization for diffuser-augmented wind turbines," Renewable Energy, Elsevier, vol. 165(P1), pages 812-822.
    7. Jerson R. P. Vaz & Adry K. F. de Lima & Erb F. Lins, 2023. "Assessment of a Diffuser-Augmented Hydrokinetic Turbine Designed for Harnessing the Flow Energy Downstream of Dams," Sustainability, MDPI, vol. 15(9), pages 1-15, May.
    8. Bontempo, R. & Manna, M., 2020. "Diffuser augmented wind turbines: Review and assessment of theoretical models," Applied Energy, Elsevier, vol. 280(C).

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    1. Keramat Siavash, Nemat & Najafi, G. & Tavakkoli Hashjin, Teymour & Ghobadian, Barat & Mahmoodi, Esmail, 2020. "Mathematical modeling of a horizontal axis shrouded wind turbine," Renewable Energy, Elsevier, vol. 146(C), pages 856-866.
    2. Nunes, Matheus M. & Brasil Junior, Antonio C.P. & Oliveira, Taygoara F., 2020. "Systematic review of diffuser-augmented horizontal-axis turbines," Renewable and Sustainable Energy Reviews, Elsevier, vol. 133(C).
    3. Bontempo, R. & Manna, M., 2020. "Diffuser augmented wind turbines: Review and assessment of theoretical models," Applied Energy, Elsevier, vol. 280(C).
    4. Rahmatian, Mohammad Ali & Hashemi Tari, Pooyan & Mojaddam, Mohammad & Majidi, Sahand, 2022. "Numerical and experimental study of the ducted diffuser effect on improving the aerodynamic performance of a micro horizontal axis wind turbine," Energy, Elsevier, vol. 245(C).
    5. Leloudas, Stavros N. & Lygidakis, Georgios N. & Eskantar, Alexandros I. & Nikolos, Ioannis K., 2020. "A robust methodology for the design optimization of diffuser augmented wind turbine shrouds," Renewable Energy, Elsevier, vol. 150(C), pages 722-742.
    6. Vaz, Jerson R.P. & Okulov, Valery L. & Wood, David H., 2021. "Finite blade functions and blade element optimization for diffuser-augmented wind turbines," Renewable Energy, Elsevier, vol. 165(P1), pages 812-822.
    7. Ali, Qazi Shahzad & Kim, Man-Hoe, 2022. "Power conversion performance of airborne wind turbine under unsteady loads," Renewable and Sustainable Energy Reviews, Elsevier, vol. 153(C).
    8. Saleem, Arslan & Kim, Man-Hoe, 2019. "Performance of buoyant shell horizontal axis wind turbine under fluctuating yaw angles," Energy, Elsevier, vol. 169(C), pages 79-91.
    9. Mohammad Hassan Ranjbar & Behnam Rafiei & Seyyed Abolfazl Nasrazadani & Kobra Gharali & Madjid Soltani & Armughan Al-Haq & Jatin Nathwani, 2021. "Power Enhancement of a Vertical Axis Wind Turbine Equipped with an Improved Duct," Energies, MDPI, vol. 14(18), pages 1-16, September.
    10. Saleem, Arslan & Kim, Man-Hoe, 2020. "Aerodynamic performance optimization of an airfoil-based airborne wind turbine using genetic algorithm," Energy, Elsevier, vol. 203(C).
    11. Ahmad Fazlizan & Wen Tong Chong & Sook Yee Yip & Wooi Ping Hew & Sin Chew Poh, 2015. "Design and Experimental Analysis of an Exhaust Air Energy Recovery Wind Turbine Generator," Energies, MDPI, vol. 8(7), pages 1-19, June.
    12. Ye, Jianjun & Cheng, Yanglin & Xie, Junlong & Huang, Xiaohong & Zhang, Yuan & Hu, Siyao & Salem, Shehab & Wu, Jiejun, 2020. "Effects of divergent angle on the flow behaviors in low speed wind accelerating ducts," Renewable Energy, Elsevier, vol. 152(C), pages 1292-1301.
    13. Ali, Qazi Shahzad & Kim, Man-Hoe, 2021. "Design and performance analysis of an airborne wind turbine for high-altitude energy harvesting," Energy, Elsevier, vol. 230(C).
    14. Sridhar, Surya & Zuber, Mohammad & B., Satish Shenoy & Kumar, Amit & Ng, Eddie Y.K. & Radhakrishnan, Jayakrishnan, 2022. "Aerodynamic comparison of slotted and non-slotted diffuser casings for Diffuser Augmented Wind Turbines (DAWT)," Renewable and Sustainable Energy Reviews, Elsevier, vol. 161(C).
    15. Sedaghat, Ahmad & Hassanzadeh, Arash & Jamali, Jamaloddin & Mostafaeipour, Ali & Chen, Wei-Hsin, 2017. "Determination of rated wind speed for maximum annual energy production of variable speed wind turbines," Applied Energy, Elsevier, vol. 205(C), pages 781-789.
    16. Heikal, Hasim A. & Abu-Elyazeed, Osayed S.M. & Nawar, Mohamed A.A. & Attai, Youssef A. & Mohamed, Maged M.S., 2018. "On the actual power coefficient by theoretical developing of the diffuser flange of wind-lens turbine," Renewable Energy, Elsevier, vol. 125(C), pages 295-305.
    17. Shahzad Ali, Qazi & Kim, Man-Hoe, 2022. "Quantifying impacts of shell augmentation on power output of airborne wind energy system at elevated heights," Energy, Elsevier, vol. 239(PA).
    18. Koichi Watanabe & Yuji Ohya & Takanori Uchida, 2019. "Power Output Enhancement of a Ducted Wind Turbine by Stabilizing Vortices around the Duct," Energies, MDPI, vol. 12(16), pages 1-17, August.
    19. Rezek, Thiago J. & Camacho, Ramiro G.R. & Manzanares-Filho, Nelson, 2023. "A novel methodology for the design of diffuser-augmented hydrokinetic rotors," Renewable Energy, Elsevier, vol. 210(C), pages 524-539.
    20. Bontempo, R. & Manna, M., 2016. "Effects of the duct thrust on the performance of ducted wind turbines," Energy, Elsevier, vol. 99(C), pages 274-287.

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:renene:v:126:y:2018:i:c:p:969-977. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.journals.elsevier.com/renewable-energy .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.