The present work, a continuation of a series of investigations on the aerodynamics of aggressive inter-turbine ducts (ITD), is aimed at providing detailed understanding of the flow physics and loss mechanisms in four different ITD geometries. A systematic experimental and computational study was carried out for varying duct mean rise angles and outlet-to-inlet area ratio while keeping the duct length-to-inlet height ratio, Reynolds number and inlet swirl constant in all four geometries. The flow structures within the ITDs were found to be dominated by the counter-rotating vortices and boundary layer separation in both the casing and hub regions. The duct mean rise angle determined the severity of adverse pressure gradient in the casing’s first bend whereas the duct area ratio mainly governed the second bend’s static pressure rise. The combination of upstream wake flow and the first bend’s adverse pressure gradient caused the boundary layer to separate and intensify the strength of counter-rotating vortices. At high mean rise angle, the separation became stronger at the casing’s first bend and moved farther upstream. At high area ratios, a 2-D separation appeared on the casing. Pressure loss penalties increased significantly with increasing duct mean rise angle and area ratio.
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ASME Turbo Expo 2014: Turbine Technical Conference and Exposition
June 16–20, 2014
Düsseldorf, Germany
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-4560-8
PROCEEDINGS PAPER
Effects of Area Ratio and Mean Rise Angle on the Aerodynamics of Inter-Turbine Ducts
Yanfeng Zhang,
Yanfeng Zhang
National Research Council of Canada, Ottawa, ON, Canada
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Shuzhen Hu,
Shuzhen Hu
National Research Council of Canada, Ottawa, ON, Canada
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Ali Mahallati,
Ali Mahallati
National Research Council of Canada, Ottawa, ON, Canada
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Xue-Feng Zhang,
Xue-Feng Zhang
National Research Council of Canada, Ottawa, ON, Canada
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Edward Vlasic
Edward Vlasic
Pratt & Whitney Canada, Longueuil, QC, Canada
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Yanfeng Zhang
National Research Council of Canada, Ottawa, ON, Canada
Shuzhen Hu
National Research Council of Canada, Ottawa, ON, Canada
Ali Mahallati
National Research Council of Canada, Ottawa, ON, Canada
Xue-Feng Zhang
National Research Council of Canada, Ottawa, ON, Canada
Edward Vlasic
Pratt & Whitney Canada, Longueuil, QC, Canada
Paper No:
GT2014-27207, V02AT40A009; 12 pages
Published Online:
September 18, 2014
Citation
Zhang, Y, Hu, S, Mahallati, A, Zhang, X, & Vlasic, E. "Effects of Area Ratio and Mean Rise Angle on the Aerodynamics of Inter-Turbine Ducts." Proceedings of the ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. Volume 2A: Turbomachinery. Düsseldorf, Germany. June 16–20, 2014. V02AT40A009. ASME. https://doi.org/10.1115/GT2014-27207
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