High-resolution liquid-crystal heat-transfer measurements on the endwall of a turbine passage with variations in Reynolds numberLocal heat-transfer coefficients were experimentally mapped on the end-wall surface of a three-times turbine vane passage in a static, single-row cascade operated with room-temperature inlet air over a range of Reynolds numbers. The test surface was a composite of commercially available materials: a Mylar sheet with a layer of cholesteric liquid crystals, which change color with temperature, and a heater made of a polyester sheet coated with vapor-deposited gold, which produces uniform heat flux. After the initial selection and calibration of the composite sheet, accurate, quantitative, and continuous heat-transfer coefficients were mapped over the end-wall surface. The local heat-transfer coefficients (expressed as nondimensional Stanton number) are presented for inlet Reynolds numbers (based on vane axial chord) from 0.83 x 10(5) to 3.97 x 10(5).
Document ID
19890065918
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hippensteele, S. A.
Russell, L. M. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Fluid Mechanics And Heat Transfer
Meeting Information
Meeting: ASME 1988 National Heat Transfer Conference