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Computational analysis of shrouded wind turbine configurations using a 3-dimensional RANS solver

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  • Aranake, Aniket C.
  • Lakshminarayan, Vinod K.
  • Duraisamy, Karthik

Abstract

The use of a shroud is known to improve performance. In this work, the flow physics and performance of shrouded turbines is assessed by solving the Reynolds Averaged Navier–Stokes equations supplemented with a transition model. Shroud geometries are evaluated for their augmentation of mass flow through the turbine. Initial assessments are performed using axisymmetric calculations of annular wings with high-lift airfoils as cross sections. The mass flow amplification factor is defined as a performance parameter and is found to increase nearly linearly with radial lift force. From a selection of considered airfoils, the Selig S1223 high-lift airfoil is found to best promote mass flow rate. Full three-dimensional simulations of shrouded wind turbines are performed for selected shroud geometries. The results are compared to open turbine solutions. Augmentation ratios of up to 1.9 are achieved. Peak augmentation occurs at the highest wind speed for which the flow over the blade stays attached. Flowfields are examined in detail and the following aspects are investigated: regions with flow separation, the development of velocity profiles, and the interaction between the turbine wake and shroud boundary layer. The sensitivity of the solutions to rotation rate is examined.

Suggested Citation

  • Aranake, Aniket C. & Lakshminarayan, Vinod K. & Duraisamy, Karthik, 2015. "Computational analysis of shrouded wind turbine configurations using a 3-dimensional RANS solver," Renewable Energy, Elsevier, vol. 75(C), pages 818-832.
    • Handle: RePEc:eee:renene:v:75:y:2015:i:c:p:818-832
    DOI: 10.1016/j.renene.2014.10.049
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    References listed on IDEAS

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    1. 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.
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    Cited by:

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    10. Zhu, Hongzhong & Sueyoshi, Makoto & Hu, Changhong & Yoshida, Shigeo, 2019. "A study on a floating type shrouded wind turbine: Design, modeling and analysis," Renewable Energy, Elsevier, vol. 134(C), pages 1099-1113.
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    13. 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.
    14. 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).
    15. Nunes, Matheus M. & Mendes, Rafael C.F. & Oliveira, Taygoara F. & Brasil Junior, Antonio C.P., 2019. "An experimental study on the diffuser-enhanced propeller hydrokinetic turbines," Renewable Energy, Elsevier, vol. 133(C), pages 840-848.
    16. Khamlaj, Tariq Abdulsalam & Rumpfkeil, Markus Peer, 2018. "Analysis and optimization of ducted wind turbines," Energy, Elsevier, vol. 162(C), pages 1234-1252.
    17. 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).
    18. Jiang, W. & Mei, Z.Y. & Wu, F. & Han, A. & Xie, Y.H. & Xie, D.M., 2022. "Effect of shroud on the energy extraction performance of oscillating foil," Energy, Elsevier, vol. 239(PD).
    19. 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.
    20. 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.
    21. 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).
    22. 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.
    23. Bontempo, R. & Manna, M., 2020. "Diffuser augmented wind turbines: Review and assessment of theoretical models," Applied Energy, Elsevier, vol. 280(C).

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