The effect of the combustor-turbine slot and mid-passage gap on vane endwall heat transfer

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

1 Citation (Scopus)

Abstract

Turbine vanes are generally manufactured as single- or double-airfoil sections that are assembled into a full turbine disk. The gaps between the individual sections, as well as a gap between the turbine disk and the combustor upstream, provide leakage paths for relatively higher pressure coolant flows. This leakage is intended to prevent ingestion of the hot combustion flow in the primary gas path. At the vane endwall, this leakage flow can interfere with the complex vortical flow present there, and thus affect the heat transfer to that surface. To determine the effect of leakage flow through the gaps, heat transfer coefficients were measured along a first-stage vane endwall and inside the mid-passage gap for a large-scale cascade with a simulated combustor-turbine interface slot and a mid-passage gap. For increasing combustor-turbine leakage flows, endwall surface heat transfer coefficients showed a slight increase in heat transfer. The presence of the mid-passage gap, however, resulted in high heat transfer near the passage throat where flow is ejected from that gap. Computational simulations indicated that a small vortex created at the gap flow ejection location contributed to the high heat transfer. The measured differences in heat transfer for the various midpassage gap flowrates tested did not appear to have a significant effect.

Original languageEnglish (US)
Title of host publicationProceedings of the ASME International Mechanical Engineering Congress and Exposition 2009, IMECE 2009
PublisherAmerican Society of Mechanical Engineers (ASME)
Pages2167-2178
Number of pages12
EditionPART C
ISBN (Print)9780791843826
DOIs
StatePublished - Jan 1 2010
EventASME 2009 International Mechanical Engineering Congress and Exposition, IMECE2009 - Lake Buena Vista, FL, United States
Duration: Nov 13 2009Nov 19 2009

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings
NumberPART C
Volume9

Other

OtherASME 2009 International Mechanical Engineering Congress and Exposition, IMECE2009
CountryUnited States
CityLake Buena Vista, FL
Period11/13/0911/19/09

Fingerprint

Combustors
Turbines
Heat transfer
Heat transfer coefficients
Cascades (fluid mechanics)
Leakage (fluid)
Airfoils
Coolants
Vortex flow
Gases

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

Lynch, S. P., & Thole, K. A. (2010). The effect of the combustor-turbine slot and mid-passage gap on vane endwall heat transfer. In Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2009, IMECE 2009 (PART C ed., pp. 2167-2178). (ASME International Mechanical Engineering Congress and Exposition, Proceedings; Vol. 9, No. PART C). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE2009-12847
Lynch, Stephen P. ; Thole, Karen A. / The effect of the combustor-turbine slot and mid-passage gap on vane endwall heat transfer. Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2009, IMECE 2009. PART C. ed. American Society of Mechanical Engineers (ASME), 2010. pp. 2167-2178 (ASME International Mechanical Engineering Congress and Exposition, Proceedings; PART C).
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Lynch, SP & Thole, KA 2010, The effect of the combustor-turbine slot and mid-passage gap on vane endwall heat transfer. in Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2009, IMECE 2009. PART C edn, ASME International Mechanical Engineering Congress and Exposition, Proceedings, no. PART C, vol. 9, American Society of Mechanical Engineers (ASME), pp. 2167-2178, ASME 2009 International Mechanical Engineering Congress and Exposition, IMECE2009, Lake Buena Vista, FL, United States, 11/13/09. https://doi.org/10.1115/IMECE2009-12847

The effect of the combustor-turbine slot and mid-passage gap on vane endwall heat transfer. / Lynch, Stephen P.; Thole, Karen A.

Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2009, IMECE 2009. PART C. ed. American Society of Mechanical Engineers (ASME), 2010. p. 2167-2178 (ASME International Mechanical Engineering Congress and Exposition, Proceedings; Vol. 9, No. PART C).

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

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AB - Turbine vanes are generally manufactured as single- or double-airfoil sections that are assembled into a full turbine disk. The gaps between the individual sections, as well as a gap between the turbine disk and the combustor upstream, provide leakage paths for relatively higher pressure coolant flows. This leakage is intended to prevent ingestion of the hot combustion flow in the primary gas path. At the vane endwall, this leakage flow can interfere with the complex vortical flow present there, and thus affect the heat transfer to that surface. To determine the effect of leakage flow through the gaps, heat transfer coefficients were measured along a first-stage vane endwall and inside the mid-passage gap for a large-scale cascade with a simulated combustor-turbine interface slot and a mid-passage gap. For increasing combustor-turbine leakage flows, endwall surface heat transfer coefficients showed a slight increase in heat transfer. The presence of the mid-passage gap, however, resulted in high heat transfer near the passage throat where flow is ejected from that gap. Computational simulations indicated that a small vortex created at the gap flow ejection location contributed to the high heat transfer. The measured differences in heat transfer for the various midpassage gap flowrates tested did not appear to have a significant effect.

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Lynch SP, Thole KA. The effect of the combustor-turbine slot and mid-passage gap on vane endwall heat transfer. In Proceedings of the ASME International Mechanical Engineering Congress and Exposition 2009, IMECE 2009. PART C ed. American Society of Mechanical Engineers (ASME). 2010. p. 2167-2178. (ASME International Mechanical Engineering Congress and Exposition, Proceedings; PART C). https://doi.org/10.1115/IMECE2009-12847