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Local heat transfer measurement with liquid crystals on rotating surfaces including non-axisymmetric casesAn overview and summary of test methods and results are given for the problem of measuring local heat transfer on rotating surfaces that model gas turbine engine disks. Disk cavity situations generically similar to those encountered in the high pressure stage disk cooling are considered, with cooling air supplied both at or near the wheel centerline as well as through single or multiple jets impinging outboard on the wheel near the blade attachment region. In some situations provision has been made for ingestion into the disk-cavity from the gas path region radially outboard of the disk. Local heat transfer rates in all cases are determined from the color display from a thin coating of encapsulated liquid crystals sprayed onto the disk, in conjunction with use of a video camera and computer vision system. For cases with axisymmetric disk surfaces, the coated surfaces are illuminated and viewed continuously, and detailed radial distributions of local Nusselt number are obtained. For non-axisymmetric disk surfaces, such as encountered in the vicinity of bolt heads, the disk is illuminated with stroboscopic light, and a method has been developed and used to synchronize the computer frame grabber with the illumination.
Document ID
19930020754
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Metzger, D. E.
(Arizona State Univ. Tempe, AZ, United States)
Kim, Y. K.
(Arizona State Univ. Tempe, AZ, United States)
Date Acquired
August 15, 2013
Publication Date
February 1, 1993
Publication Information
Publication: AGARD, Heat Transfer and Cooling in Gas Turbines
Subject Category
Aircraft Propulsion And Power
Accession Number
93N29943
Distribution Limits
Public
Copyright
Other
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