Effects of an embedded vortex on a single film-cooling jet in a turbulent boundary layer
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Authors
Williams, Warren W.
Subjects
Embedded Vortex
Film-Cooling Single Jet
Heat Transfer
Endwall Secondary Flows
Film-Cooling Single Jet
Heat Transfer
Endwall Secondary Flows
Advisors
Ligrani, Phillip M.
Date of Issue
1988-06
Date
Publisher
Monterey, California : Naval Postgraduate School
Language
en_US
Abstract
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.
Type
Thesis
Description
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
Funder
Format
Citation
Distribution Statement
Approved for public release; distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.