Aerodynamic loss for a turbine blade with endwall leakage features and contouring

Stephen P. Lynch, Karen A. Thole, Atul Kohli, Christopher Lehane, Tom Praisner

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

Abstract

Secondary flows near the endwall of a turbine blade contribute to a loss in aerodynamic performance in the engine. Further reductions in performance occur when the secondary flows interact with leakage flow from necessary clearance features, such as the clearance gap between the blade rotor and an upstream stator or gaps between adjacent blade platforms. Non-axisymmetric endwall contouring has been shown to reduce the strength of secondary flows near the endwall, but relatively little research has been done to test the sensitivity of the contouring to the endwall leakage features. This paper describes aerodynamic measurements taken downstream of a cascade with representative leakage features. In general, upstream leakage flow with swirl relative to the blade increased aerodynamic loss, relative to leakage that was matched to the blade wheelspeed. Non-axisymmetric contouring for an endwall without a platform gap reduced underturning of the flow but had no effect on overall loss, relative to a flat endwall without a gap. A contoured endwall with a platform gap had 12% higher mixed-out loss than a contoured endwall without a gap.

Original languageEnglish (US)
Title of host publicationASME Turbo Expo 2013
Subtitle of host publicationTurbine Technical Conference and Exposition, GT 2013
DOIs
StatePublished - Dec 17 2013
EventASME Turbo Expo 2013: Turbine Technical Conference and Exposition, GT 2013 - San Antonio, Tx, United States
Duration: Jun 3 2013Jun 7 2013

Publication series

NameProceedings of the ASME Turbo Expo
Volume6 A

Other

OtherASME Turbo Expo 2013: Turbine Technical Conference and Exposition, GT 2013
CountryUnited States
CitySan Antonio, Tx
Period6/3/136/7/13

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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  • Cite this

    Lynch, S. P., Thole, K. A., Kohli, A., Lehane, C., & Praisner, T. (2013). Aerodynamic loss for a turbine blade with endwall leakage features and contouring. In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition, GT 2013 (Proceedings of the ASME Turbo Expo; Vol. 6 A). https://doi.org/10.1115/GT2013-94943