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Measurements in film cooling flows [electronic resource] : Hole L/D and turbulence intensity effects

Published
Washington, D.C. : United States. Dept. of Energy, 1996.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
13 pages : digital, PDF file
Additional Creators
University of Minnesota. Department of Mechanical Engineering, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Hot-wire anemometry of simulated film cooling was used to study the influence of freestream turbulence intensity and film cooling hole length-to-diameter ratio on mean velocity and turbulence intensity. Measurements were made in the zone where the coolant and freestream flows mix. Flow from one row of film cooling holes with a streamwise injection of 35° and no lateral injection and with a coolant- to-freestream flow velocity ratio of 1.0 was investigated under freestream turbulence levels of 0.5 and 12%. Coolant-to-freestream density ratio was unity. Two length-to-diameter ratios for the film cooling holes, 2.3 and 7.0, are tested. Results show that under low freestream turbulence conditions, pronounced differences exist in the flowfield between L/D=7.0 and 2.3; the differences are less prominent at high freestream turbulence intensities. Generally, short-L/D injection results in ``jetting`` of the coolant further into the freestream flow and enhanced mixing. Other changes in the flowfield attributable to a rise in freestream turbulence intensity to engine- representative conditions are documented. 15 figs, 2 tabs, refs.
Report Numbers
E 1.99:doe/mc/29061--97/c0776
E 1.99: conf-961105--23
conf-961105--23
doe/mc/29061--97/c0776
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
12/31/1996.
"doe/mc/29061--97/c0776"
" conf-961105--23"
"DE97051909"
1996 international mechanical engineering congress and exhibition, Atlanta, GA (United States), 17-22 Nov 1996.
Simon, T.W.; Burd, S.W.; Kaszeta, R.W.
Funding Information
FC21-92MC29061
View MARC record | catkey: 13599665