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An experimental study of reverse compound lean in a linear turbine cascade.

Bagshaw, D. and Ingram, G. and Gregory-Smith, D. G. and Stokes, M. (2005) 'An experimental study of reverse compound lean in a linear turbine cascade.', Proceedings of the I MECH E part A : journal of power and energy., 219 (6). pp. 443-449.

Abstract

This paper describes a detailed experimental investigation into the effects of reverse compound lean (RCL) in a highly loaded axial turbine cascade. The geometry was designed using fully three-dimensional viscous CFD calculations to achieve a reduction in secondary flow. Traverses were made upstream and downstream with three-hole and five-hole probes to quantify the effects on the flow and losses produced by the leaned blade compared with a prismatic blade. These measurements were supplemented with blade static pressure measurements and surface flow visualization. It was found that the RCL blade produced higher overturning at the end-wall accompanied by higher secondary loss but this was constrained closer to the end-wall. Near mid-span, the turning was reduced slightly but the overall turning for the row was unaltered. The mid-span showed much less loss, so that overall the loss was reduced by 11 per cent. An understanding of these effects may be gained by consideration of the three-dimensional effects produced by the RCL.

Item Type:Article
Additional Information:Special issue paper: 451
Keywords:Turbine blades, Secondary flow, Blade lean, Dihedral experiment, Unsteady wake, Boundary layer, Separation, Transition, High-lift blade.
Full text:PDF - Published Version (334Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1243/095765005X31199
Publisher statement:© Bagshaw, D. and Ingram, G. and Gregory-Smith, D. G. and Stokes, M. 2005. The definitive, peer reviewed and edited version of this article is published in Proceedings of the I MECH E part A : journal of power and energy, 219, 6, pp. 443-449, 10.1243/095765005X31199
Record Created:23 Apr 2008
Last Modified:24 May 2011 09:20

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