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

Bagshaw, D.; Ingram, G.; Gregory-Smith, D.G.; Stokes, M.

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.

Citation

Bagshaw, D., Ingram, G., Gregory-Smith, D., & Stokes, M. (2005). An experimental study of reverse compound lean in a linear turbine cascade. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 219(6), 443-449. https://doi.org/10.1243/095765005x31199

• Journal Article Type: Article
• Publication Date: 2005-09
• Deposit Date: Apr 23, 2008
• Publicly Available Date: Feb 15, 2010
• Journal: Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
• Print ISSN: 0957-6509
• Publisher: SAGE Publications
• Peer Reviewed: Peer Reviewed
• Volume: 219
• Issue: 6
• Pages: 443-449
• DOI: https://doi.org/10.1243/095765005x31199
• Keywords: Turbine blades, Secondary flow, Blade lean, Dihedral experiment, Unsteady wake, Boundary layer, Separation, Transition, High-lift blade.
• Publisher URL: http://journals.pepublishing.com/(ppeq53yuvytzb2nukmiszsaa)/app/home/contribution.asp?referrer=parent&backto=issue,5,12;journal,6,62;linkingpublicationresults,1:119773,1