Effects of an embedded vortex on a single film-cooling jet in a turbulent boundary layer

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Author
Williams, Warren W.
Date
1988-06Advisor
Ligrani, Phillip M.
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Show full item recordAbstract
Effects of embedded longitudinal vortices on heat
transfer in a turbulent boundary layer film cooled from a
single injection hole are discussed. Film coolant was
injected at blowing ratios 0.50 to 1.50 at a freestream
velocity of 10 m/s. A single longitudinal vortex was
induced upstream of the film-cooling holes. Heat transfer
measurements were made downstream of injection. Flow
visualization tests were conducted after the injectant
was contaminated with smoke. Surveys of mean velocity and
mean temperature were also made in different spanwise normal
planes. For all blowing ratios examined, the embedded
vortices cause significant alterations to wall heat transfer
and to film-cooling distributions.
Measurement of mean temperature and mean velocities
in spanwise planes show that injectant is pushed to the
upwash side of the vortex when the injection hole is
located beneath the vortex core or vortex downwash.
Evidence of injection is seen only for x/d<7.4.
For other injection locations with respect to the vortex
core, evidence of injectant appears for x/d up to 96, and
the injectant is not swept into the vortex upwash by
secondary flows.
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