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Analysis of interference factors of air turbine cascades

Journal Article


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Abstract


  • This paper reports viscous compressible aerodynamics analysis of two-dimensional cascades (arrays of aerofoils). The study elucidates the effect of cascade parameters such as solidity, δ, and angle of attack, α on the interference between blades. Understanding the interference behaviour is important in the performance analysis of air turbines such as Wells turbine commonly used in oscillating water column (OWC) - wave energy converter (WEC) system. The present analysis shows that isolated two-dimensional lift coefficient modified by interference factors, Kο, based on inviscid flow theory is acceptable for low solidity cascades, i.e. δ > 0.5, Kο, and that stall occurs at lower angle of attack in cascade compared to isolated aerofoil. When δ > 0.5, Kο is shown to depend on both α and δ especially in the post-stall flow. The result suggests that interference factors that is applicable for wide range of flow conditions as in Wells turbines should also include the α effect in the modifier.

Publication Date


  • 2013

Citation


  • Gareev, A., Kosasih, B. & Cooper, P. (2013). Analysis of interference factors of air turbine cascades. Engineering Applications of Computational Fluid Mechanics, 7 (4), 496-506.

Scopus Eid


  • 2-s2.0-84890457082

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3080&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2071

Number Of Pages


  • 10

Start Page


  • 496

End Page


  • 506

Volume


  • 7

Issue


  • 4

Place Of Publication


  • http://jeacfm.cse.polyu.edu.hk/

Abstract


  • This paper reports viscous compressible aerodynamics analysis of two-dimensional cascades (arrays of aerofoils). The study elucidates the effect of cascade parameters such as solidity, δ, and angle of attack, α on the interference between blades. Understanding the interference behaviour is important in the performance analysis of air turbines such as Wells turbine commonly used in oscillating water column (OWC) - wave energy converter (WEC) system. The present analysis shows that isolated two-dimensional lift coefficient modified by interference factors, Kο, based on inviscid flow theory is acceptable for low solidity cascades, i.e. δ > 0.5, Kο, and that stall occurs at lower angle of attack in cascade compared to isolated aerofoil. When δ > 0.5, Kο is shown to depend on both α and δ especially in the post-stall flow. The result suggests that interference factors that is applicable for wide range of flow conditions as in Wells turbines should also include the α effect in the modifier.

Publication Date


  • 2013

Citation


  • Gareev, A., Kosasih, B. & Cooper, P. (2013). Analysis of interference factors of air turbine cascades. Engineering Applications of Computational Fluid Mechanics, 7 (4), 496-506.

Scopus Eid


  • 2-s2.0-84890457082

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3080&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2071

Number Of Pages


  • 10

Start Page


  • 496

End Page


  • 506

Volume


  • 7

Issue


  • 4

Place Of Publication


  • http://jeacfm.cse.polyu.edu.hk/