Computational study of a midpassage gap and upstream slot on vane endwall film-cooling

Satoshi Hada, Karen A. Thole

Research output: Contribution to journalArticle

30 Scopus citations

Abstract

Turbines are designed to operate with high inlet temperatures to improve engine performance. To reduce NOx resulting from combustion, designs for combustors attempt to achieve flat pattern factors that results in high levels of heat transfer to the endwall of the first stage vane. Film-cooling is still one of the most effective cooling methods for many component features including the endwall. This paper presents results from a computational study of a film-cooled endwall. The endwall design considers both an upstream slot, representing the combustor-turbine junction, and a midpassage slot, representing the mating between the adjacent vanes. The focus of this study is on comparing adiabatic effectiveness levels on the endwall with varying leakage flowrates and gap widths. Results indicate reasonable agreement between computational predictions and experimental measurements of adiabatic effectiveness levels along the endwall. The results of this study show that the midpassage slot has a large influence on the coolant coverage. It was also shown that by raising the combustor relative to the downstream vane endwall, better coolant coverage from the combustor-turbine slot could be achieved.

Original languageEnglish (US)
Article number011024
JournalJournal of Turbomachinery
Volume133
Issue number1
DOIs
StatePublished - Jan 31 2011

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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