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Title: Local heat-transfer measurements on a large scale-model turbine blade airfoil using a composite of a heater element and liquid crystals

Abstract

Local heat-transfer coefficients were experimentally mapped along the midchord of a five-times-size turbine blade airfoil in a static cascade operated at room temperature over a range of Reynolds numbers. The test surface consisted of a composite of commercially available materials: a mylar sheet with a layer of cholesteric liquid crystals, which change color with temperature, and a heater sheet made of a carbon-impregnated paper, 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 airfoil surface. The local heat-transfer coefficients are presented for Reynolds numbers from 2.8 X 10/sup 5/ to 7.6 X 10/sup 5/. Comparisons are made with analytical values of heat-transfer coefficients obtained from the STAN5 boundary layer code. Also, a leading-edge separation bubble was revealed by thermal and flow visualization.

Authors:
; ;
Publication Date:
Research Org.:
National Aeronautics and Space Administration, Lewis Research Center, Cleveland, OH
OSTI Identifier:
5987610
Resource Type:
Journal Article
Journal Name:
J. Eng. Gas Turbines Power; (United States)
Additional Journal Information:
Journal Volume: 107:4
Country of Publication:
United States
Language:
English
Subject:
20 FOSSIL-FUELED POWER PLANTS; 42 ENGINEERING; AIRFOILS; HEAT TRANSFER; SURFACES; THERMAL ANALYSIS; TURBINE BLADES; BOUNDARY LAYERS; BUBBLE GROWTH; CARBON; LIQUID CRYSTALS; PAPER; REYNOLDS NUMBER; SHEETS; TEMPERATURE MEASUREMENT; THERMODYNAMICS; CRYSTALS; ELEMENTS; ENERGY TRANSFER; FLUIDS; LAYERS; LIQUIDS; NONMETALS; 200104* - Fossil-Fueled Power Plants- Components; 420400 - Engineering- Heat Transfer & Fluid Flow

Citation Formats

Hippensteele, S A, Russell, L M, and Torres, F J. Local heat-transfer measurements on a large scale-model turbine blade airfoil using a composite of a heater element and liquid crystals. United States: N. p., 1985. Web. doi:10.1115/1.3239841.
Hippensteele, S A, Russell, L M, & Torres, F J. Local heat-transfer measurements on a large scale-model turbine blade airfoil using a composite of a heater element and liquid crystals. United States. https://doi.org/10.1115/1.3239841
Hippensteele, S A, Russell, L M, and Torres, F J. 1985. "Local heat-transfer measurements on a large scale-model turbine blade airfoil using a composite of a heater element and liquid crystals". United States. https://doi.org/10.1115/1.3239841.
@article{osti_5987610,
title = {Local heat-transfer measurements on a large scale-model turbine blade airfoil using a composite of a heater element and liquid crystals},
author = {Hippensteele, S A and Russell, L M and Torres, F J},
abstractNote = {Local heat-transfer coefficients were experimentally mapped along the midchord of a five-times-size turbine blade airfoil in a static cascade operated at room temperature over a range of Reynolds numbers. The test surface consisted of a composite of commercially available materials: a mylar sheet with a layer of cholesteric liquid crystals, which change color with temperature, and a heater sheet made of a carbon-impregnated paper, 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 airfoil surface. The local heat-transfer coefficients are presented for Reynolds numbers from 2.8 X 10/sup 5/ to 7.6 X 10/sup 5/. Comparisons are made with analytical values of heat-transfer coefficients obtained from the STAN5 boundary layer code. Also, a leading-edge separation bubble was revealed by thermal and flow visualization.},
doi = {10.1115/1.3239841},
url = {https://www.osti.gov/biblio/5987610}, journal = {J. Eng. Gas Turbines Power; (United States)},
number = ,
volume = 107:4,
place = {United States},
year = {Tue Oct 01 00:00:00 EDT 1985},
month = {Tue Oct 01 00:00:00 EDT 1985}
}