An analysis of secondary flow structures and losses in a variable-vane radial turbine geometry is provided based on CFD. A complete turbine stage of a commercial vehicle turbocharger is modeled, including the entire 360° rotor and stator, in order to account for the circumferential non-uniformity of the flow. The full-stage model consists of approximately 12,500,000 nodes. The stator domain accounts for the endwall clearance on the hub side of the nozzle vanes. As an additional feature typical for variable turbine geometries, cylindrical shaft seals at the stator vane axis at hub and shroud as well as four circumferentially equidistant spacers are modeled. These geometrical details allow a more realistic simulation of the stator domain. In an analysis using fields of helicity and Q-Criterion, the present features are found to induce additional secondary vortices in the stator, in addition to the inflow and horse shoe vortices found by previous investigators. A detailed analysis of the secondary flow structures in this realistic stator shows that the spacers contribute 33% to the overall stator losses.
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ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition
June 6–10, 2011
Vancouver, British Columbia, Canada
Conference Sponsors:
- International Gas Turbine Institute
ISBN:
978-0-7918-5463-1
PROCEEDINGS PAPER
Secondary Flow Structures and Losses in a Radial Turbine Nozzle
Christoph K. Natkaniec,
Christoph K. Natkaniec
Leibniz University Hannover, Hannover, Germany
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Jasper Kammeyer,
Jasper Kammeyer
Leibniz University Hannover, Hannover, Germany
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Joerg R. Seume
Joerg R. Seume
Leibniz University Hannover, Hannover, Germany
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Christoph K. Natkaniec
Leibniz University Hannover, Hannover, Germany
Jasper Kammeyer
Leibniz University Hannover, Hannover, Germany
Joerg R. Seume
Leibniz University Hannover, Hannover, Germany
Paper No:
GT2011-46753, pp. 977-987; 11 pages
Published Online:
May 3, 2012
Citation
Natkaniec, CK, Kammeyer, J, & Seume, JR. "Secondary Flow Structures and Losses in a Radial Turbine Nozzle." Proceedings of the ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. Volume 3: Controls, Diagnostics and Instrumentation; Education; Electric Power; Microturbines and Small Turbomachinery; Solar Brayton and Rankine Cycle. Vancouver, British Columbia, Canada. June 6–10, 2011. pp. 977-987. ASME. https://doi.org/10.1115/GT2011-46753
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