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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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    11. 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.
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    13. 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).
    14. 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.
    15. Hosseini, S. Rasoul & Ganji, Davoud Domiri, 2020. "A novel design of nozzle-diffuser to enhance performance of INVELOX wind turbine," Energy, Elsevier, vol. 198(C).
    16. Saleem, Arslan & Kim, Man-Hoe, 2020. "Aerodynamic performance optimization of an airfoil-based airborne wind turbine using genetic algorithm," Energy, Elsevier, vol. 203(C).
    17. Kumar, Vedant & Saha, Sandeep, 2019. "Theoretical performance estimation of shrouded-twin-rotor wind turbines using the actuator disk theory," Renewable Energy, Elsevier, vol. 134(C), pages 961-969.
    18. 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.
    19. Ahmadi Asl, Hamid & Kamali Monfared, Reza & Rad, Manouchehr, 2017. "Experimental investigation of blade number and design effects for a ducted wind turbine," Renewable Energy, Elsevier, vol. 105(C), pages 334-343.
    20. Khamlaj, Tariq Abdulsalam & Rumpfkeil, Markus Peer, 2018. "Analysis and optimization of ducted wind turbines," Energy, Elsevier, vol. 162(C), pages 1234-1252.
    21. Dogru, Safak & Yilmaz, Oktay, 2024. "Extensive design and aerodynamic performance investigation of diffuser augmented wind turbine (DAWT) guided by generalized actuator disc theory," Renewable and Sustainable Energy Reviews, Elsevier, vol. 192(C).
    22. Borg, Mitchell G. & Xiao, Qing & Allsop, Steven & Incecik, Atilla & Peyrard, Christophe, 2022. "A numerical performance analysis of a ducted, high-solidity tidal turbine in yawed flow conditions," Renewable Energy, Elsevier, vol. 193(C), pages 179-194.
    23. Silva, Paulo A.S.F. & Tsoutsanis, Panagiotis & Vaz, Jerson R.P. & Macias, Marianela M., 2024. "A comprehensive CFD investigation of tip vortex trajectory in shrouded wind turbines using compressible RANS solver," Energy, Elsevier, vol. 294(C).
    24. 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).
    25. 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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