Numerical Simulation of Vertical Axis Wind Turbine at Low Speed Ratios

1
Vladimir CardoA
Vladimir CardoA
2
Ion MAflAfel
Ion MAflAfel
3
Horia Dumitrescu
Horia Dumitrescu
1 Gh. Mihoc-C. Iacoba Institute of Mathematical Statistics and Applied Mathematics, Bucharest, Romania

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A renewed interest in vertical axis wind turbines (VAWT) has been seen recently, in particular at relatively low Reynolds number (Rec ≈ 1 0 5 ) appropriate to the urban applications. From this perspective, the Computational Fluid Dynamics (CFD) is regarded as a promising technique for aerodynamic studies of VAWT. The paper presents a computational investigation on a particular dynamic stall phenomenon associated with unsteady flow around the NACA 0018 a irfoil of a three s traight bladed rotor, at high angle of attack (AOA). Two airfoil flows with angle of attack higher than 45 o of an isolated blade and a confined blade in rotor at low speed ratios (TSR), are numerically simulated using CFD. It is concluded that the quasi-steady prediction used in previous models is in disagreement with experimental and numerical data because the unsteadiness generated by spinning rotor, though very important for the self-starting of VAWT, in the past were ignored.

14 Cites in Articles

References

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  2. T Cebeci,M Platzer,H Chen,K Chang,J Shao (2005). Analysis of low-speed unsteady airfoil flows.
  3. Wang Ingham,B Ma,L Pourkashanian,M Tao,Z (2010). Numerical investigations on dynamic stall of low Reynolds number flow around oscillating airfoils.
  4. A Allet,S Halle,I Paraschivoiu (1999). Numerical simulation of dynamic stall around an airfoil in Darrieus motion.
  5. Philippe Wernert,Wolfgang Geissler,Markus Raffel,Juergen Kompenhans (1996). Experimental and numerical investigations of dynamic stall on a pitching airfoil.
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  7. I Paraschivoiu (2002). Chapter 3 The Darrieus Wind-Turbine Concept.
  8. R Sheldahl,P Klimas (1981). Aerodynamic characteristics of seven symmetrical airfoil sections through 180-degree angle of attack for use in aerodynamic analysis of vertical axis wind turbines.
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  10. N Sørensen,J Michelsen (2004). Drag Prediction for Blades at High Angle of Attack Using CFD.
  11. A Travin,M Shur,M Strelets,P Spalart (2004). Physical and numerical upgrades in the detached-eddy simulation of complex turbulent flows.
  12. K Gharali,D Johnson (2011). Numerical modeling of an S809 airfoil under dynamic stall, erosion and high reduced frequencies.
  13. N Sørensen,J Michelsen (2004). Drag Prediction for Blades at High Angle of Attack Using CFD.
  14. Haiyang Gao,Hui Hu,Z Wang (2008). Computational Study of Unsteady Flows around Dragonfly and Smooth Airfoils at Low Reynolds Numbers.

Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

Vladimir CardoA. 2014. \u201cNumerical Simulation of Vertical Axis Wind Turbine at Low Speed Ratios\u201d. Global Journal of Research in Engineering - I: Numerical Methods GJRE-I Volume 14 (GJRE Volume 14 Issue I1): .

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Journal Specifications

Crossref Journal DOI 10.17406/gjre

Print ISSN 0975-5861

e-ISSN 2249-4596

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v1.2

Issue date

June 30, 2014

Language

English

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A renewed interest in vertical axis wind turbines (VAWT) has been seen recently, in particular at relatively low Reynolds number (Rec ≈ 1 0 5 ) appropriate to the urban applications. From this perspective, the Computational Fluid Dynamics (CFD) is regarded as a promising technique for aerodynamic studies of VAWT. The paper presents a computational investigation on a particular dynamic stall phenomenon associated with unsteady flow around the NACA 0018 a irfoil of a three s traight bladed rotor, at high angle of attack (AOA). Two airfoil flows with angle of attack higher than 45 o of an isolated blade and a confined blade in rotor at low speed ratios (TSR), are numerically simulated using CFD. It is concluded that the quasi-steady prediction used in previous models is in disagreement with experimental and numerical data because the unsteadiness generated by spinning rotor, though very important for the self-starting of VAWT, in the past were ignored.

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Numerical Simulation of Vertical Axis Wind Turbine at Low Speed Ratios

Ion MAflAfel
Ion MAflAfel
Horia Dumitrescu
Horia Dumitrescu
Vladimir CardoA
Vladimir CardoA Gh. Mihoc-C. Iacoba Institute of Mathematical Statistics and Applied Mathematics, Bucharest, Romania

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