Heat transfer measurements in a first-stage nozzle cascade having endwall contouring: Misalignment and leakage studies

Justin D. Piggush, T. W. Simon

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

This work supports new gas turbine designs for improved performance by evaluating endwall heat transfer rates in a cascade that is representative of a first-stage stator passage and incorporates endwall assembly features and leakage. Assembly features, such as gaps in the endwall and misalignment of those gaps, disrupt the endwall boundary layer typically leading to enhanced heat transfer rates. Leakage flows through such gaps within the passage can also affect endwall boundary layers and may induce additional secondary flows and vortex structures in the passage near the endwall. The present paper documents leakage flow and misalignment effects on the endwall heat transfer coefficients within a passage which has one axially contoured and one straight endwall. In particular features associated with the combustqr-to-turbine transition piece and the assembly joint on the vane platform are addressed. COpyright

Original languageEnglish (US)
Pages (from-to)782-790
Number of pages9
JournalJournal of Turbomachinery
Volume129
Issue number4
DOIs
StatePublished - Oct 1 2007

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