Endwall film cooling performance for a first-stage guide vane with upstream combustor walls and inlet injection

Xing Yang, Zhao Liu, Zhansheng Liu, Terrence W Simon, Zhenping Feng

Research output: Contribution to journalArticle

Abstract

Effects of an upstream combustor wall on turbine nozzle endwall film cooling performance are numerically examined in a linear cascade in this paper. Film cooling is by two rows of cooling holes at 20% of the axial chord length upstream of the vane leading edge (LE) plane. The combustor walls are modeled as flat plates with square trailing edges (TE) positioned upstream of the endwall film cooling holes. A combustor wall is in line with the LE of every second vane. The influence of the combustor wall, when shifted in the axial and tangential directions, is investigated to determine effects on passage endwall cooling for three representative film cooling blowing ratios. The results show how shed vortices from the combustor wall greatly alter the flow field near the cooling holes and inside the vane passage. Film cooling distribution patterns, particularly in the entry region and along the pressure side of the passage, are affected. The combustor wall leads to an imbalance in film cooling distribution over the endwalls for adjacent vane passages. Results show a larger effect of tangential shift of the combustor wall on endwall cooling effectiveness than the effect of an equal axial shift. The study provides guidance regarding design of combustor-to-turbine transition ducts.

LanguageEnglish (US)
Article number011008
JournalJournal of Thermal Science and Engineering Applications
Volume11
Issue number1
DOIs
StatePublished - Feb 1 2019

Fingerprint

guide vanes
film cooling
combustion chambers
Combustors
upstream
injection
Cooling
vanes
cooling
turbines
leading edges
Turbines
distribution (property)
trailing edges
blowing
shift
flat plates
ducts
entry
nozzles

Keywords

  • Combustor wall
  • Gas turbine endwall
  • Inlet film cooling
  • Nonuniform inlet condition
  • Numerical simulation

Cite this

Endwall film cooling performance for a first-stage guide vane with upstream combustor walls and inlet injection. / Yang, Xing; Liu, Zhao; Liu, Zhansheng; Simon, Terrence W; Feng, Zhenping.

In: Journal of Thermal Science and Engineering Applications, Vol. 11, No. 1, 011008, 01.02.2019.

Research output: Contribution to journalArticle

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