The two-dimensional behavior of film cooling jets on concave surfaces

S. G. Schwarz, R. J. Goldstein

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Local impermeable wall effectiveness is measured along a concave surface downstream of a row of film cooling jets. Three different injection hole diameters, two density ratios (0.95 and 2.0), and a wide range of blowing rates (0.3 to 2.7) are considered. Except close to injection, where normal momentum is strong, an increase in blowing rate results in improved film cooling performance. This is attributed to an increase in thermal mass (capacity) of coolant, tangential momentum of the jet, and blockage. Far downstream of injection, the normal and tangential momentum weaken, but blockage and large thermal mass at high injection rates still keep effectiveness high. Lateral mixing of the jets caused by the unstable concave mainflow results in film-cooling performance, which correlates well with the same parameter, which is influential in slot injection on a flat surface. Deviation from this twodimensional behavior is found only at very low blowing rates and weak wall curvature.

Original languageEnglish (US)
Pages (from-to)124-130
Number of pages7
JournalJournal of Turbomachinery
Volume111
Issue number2
DOIs
StatePublished - Apr 1989

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