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Wake-induced unsteady stagnation-region heat-transfer measurementsResults of an experimental investigation of wake-induced unsteady heat transfer in the stagnation region of a cylinder are presented. A quasi-steady representation of the stator/rotor interaction in a gas turbine using two stationary cylinders in crossflow is created. Time-averaged and time-resolved heat-transfer results are obtained over a wide range of Reynolds numbers at two Mach numbers: one incompressible and one transonic. The augmentation of the heat transfer in the stagnation region due to wake unsteadiness is documented by comparison with isolated cylinder tests. The time-averaged heat-transfer rate at the stagnation line, expressed in terms of the Frossling number, is found to reach a maximum independent of the Reynolds number. The power spectra and cross correlation of the heat-transfer signals in the stagnation region reveal the importance of large vortical structures shed from the upstream wake generator.
Document ID
19930035424
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Magari, P. J.
(NASA Lewis Research Center Cleveland, OH, United States)
Lagraff, L. E.
(Syracuse Univ. NY, United States)
Date Acquired
August 15, 2013
Publication Date
June 1, 1992
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
ASME PAPER 92-GT-196
Meeting Information
Meeting: ASME, International Gas Turbine and Aeroengine Congress and Exposition
Location: Cologne
Country: Germany
Start Date: June 1, 1992
End Date: June 4, 1992
Sponsors: ASME
Accession Number
93A19421
Funding Number(s)
CONTRACT_GRANT: NAG3-621
Distribution Limits
Public
Copyright
Other

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