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A Numerical Investigation of Loss Coefficient Variation in Various Incidence Angles in Tandem Blades Cascade
Amirkabir University of Technology.ORCID iD: 0000-0001-5143-7729
Amirkabir University of Technology.
Amirkabir University of Technology.
2014 (English)In: A Numerical Investigation of Loss Coefficient Variation in Various Incidence Angles in Tandem Blades Cascade, 2014Conference paper, Published paper (Refereed)
Abstract [en]

There is a severe tendency to reduce weight and increase power of gas turbine. Such a requirement is fulfilled by higher pressure ratio of compressor stages. Employing tandem blades in multi-stage axial flow compressors is a promising methodology to control separation on suction sides of blades and simultaneously implement higher turning angle to achieve higher pressure ratio. The present study takes into account the high flow deflection capabilities of the tandem blades consisting of NACA-65 airfoil with fixed percent pitch and axial overlap at various flow incidence angles. In this regard, a two-dimensional cascade model of tandem blades is constructed in a numerical environment. The inlet flow angle is varied in a wide range and overall loss coefficient and deviation angles are computed. Moreover, the flow phenomena between the blades and performance of both forward and afterward blades are investigated. At the end, the aerodynamic flow coefficient of tandem blades are also computed with equivalent single blades to evaluate the performance of such blades in both design and off-design domain of operations. The results show that tandem blades are quite capable of providing higher deflection with lower loss in a wide range of operation and the base profile can be successfully used in design of axial flow compressor. In comparison to equivalent single blades, tandem blades have less dissipation because the momentum exerted on suction side of tandem blades confines the size of separation zone near trailing edges of blades.

Place, publisher, year, edition, pages
2014.
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:ltu:diva-32430DOI: 10.1115/IMECE2014-39881Local ID: 6ec6ea71-e553-4ff5-b292-0a503e4f1e1bOAI: oai:DiVA.org:ltu-32430DiVA, id: diva2:1005664
Conference
ASME 2014 International Mechanical Engineering Congress & Exposition : 14/11/2014 - 20/11/2014
Note
Upprättat; 2014; 20150331 (arasol)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-29Bibliographically approved

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Publisher's full texthttp://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=2204467

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Dehkharqani, Arash Soltani

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CiteExportLink to record
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  • apa
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