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Numerical investigation of performance refinement of a drag wind rotor using flow augmentation and momentum exchange optimization

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  • Mohammadi, M.
  • Mohammadi, R.
  • Ramadan, A.
  • Mohamed, M.H.

Abstract

Numerical ascertainment of improving performance of modified Savonius rotor as decreasing the minimum wind speed required for initiating the rotation is investigated using 3D flow predictions executed in ANSYS-FLUENT. For making the comparison feasible, the design represented in a similar paper is simulated and performance is compared with empirical data. Different types of nozzles are added after observing acceptable agreement between empirical and simulation results. Nozzle acts like an air intake on the advancing blade and fortifies the acting flow; it also eliminates the reverse moment caused by contacting the flow with returning blade. Therefore, increasing in power coefficient is anticipated. Systematic analysis of obtained torque and power coefficients with and without nozzle are presented. In the next step, this work is dedicated to bucket shape optimization. Buckets with multi-curvature are introduced and have been investigated in three stages. By installing a simple nozzle with tail in front of a Savonius wind turbine with double-curved two stage buckets, the Savonius turbine maximum power coefficient is improved from 0.13 to 0.39.

Suggested Citation

  • Mohammadi, M. & Mohammadi, R. & Ramadan, A. & Mohamed, M.H., 2018. "Numerical investigation of performance refinement of a drag wind rotor using flow augmentation and momentum exchange optimization," Energy, Elsevier, vol. 158(C), pages 592-606.
    • Handle: RePEc:eee:energy:v:158:y:2018:i:c:p:592-606
    DOI: 10.1016/j.energy.2018.06.072
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    References listed on IDEAS

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    Cited by:

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    5. Zhang, Yongchao & Kang, Can & Ji, Yanguang & Li, Qing, 2019. "Experimental and numerical investigation of flow patterns and performance of a modified Savonius hydrokinetic rotor," Renewable Energy, Elsevier, vol. 141(C), pages 1067-1079.
    6. Altaf Hussain Rajpar & Imran Ali & Ahmad E. Eladwi & Mohamed Bashir Ali Bashir, 2021. "Recent Development in the Design of Wind Deflectors for Vertical Axis Wind Turbine: A Review," Energies, MDPI, vol. 14(16), pages 1-23, August.
    7. Nematollahi, Omid & Alamdari, Pouria & Jahangiri, Mehdi & Sedaghat, Ahmad & Alemrajabi, Ali Akbar, 2019. "A techno-economical assessment of solar/wind resources and hydrogen production: A case study with GIS maps," Energy, Elsevier, vol. 175(C), pages 914-930.

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