Hydradynamic and thermal measurements in a turbulent boundary layer recovering from concave curvature

M. D. Kestoras, T. W. Simon

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The behavior of a boundary layer on aflat wall downstream of sustained concave curvature is documented. Experiments are conducted with negligible streamwise pressure gradient and a low free-stream turbulence intensity (0.6 percent). The turbulent boundary layer has a moderate strength of curvature (δ/R = 0.024) at the entry to the recovery section. Results show that the skin friction coefficient, which increases over the concave wall, decreases rapidly at first over the recovery wall, then slowly approaches flat-wall values. Stanton number values decrease rapidly, undershooting expected flat-wall values. A discussion of this behavior, supported by profile measurements, is given. Effects include destabilization in the concavecurved flow and rapid streamline readjustment (acceleration) at the end of the curved section. Goertler vortices established on the curved wall persist onto the recovery wall; however, their effects weaken.

Original languageEnglish (US)
Pages (from-to)891-898
Number of pages8
JournalJournal of Turbomachinery
Volume114
Issue number4
DOIs
StatePublished - Oct 1992

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