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Comparisons of Gas-phase Temperature Measurements in a Flame Using Thin-Filament Pyrometry and ThermocouplesLess-intrusive, fast-responding, and full-field temperature measurements have long been a desired tool for the research community. Recently, the emission of a silicon-carbide (SiC) fiber placed in a flowing hot (or reacting) gas has been used to measure the temperature profile along the length of the fiber. The relationship between the gas and fiber temperature comes from an energy balance on the fiber. In the present work, we compared single point flame temperature measurements using thin-filament pyrometry (TFP) and thermocouples. The data was from vertically traversing a thermocouple and a SiC fiber through a methanol/air diffusion flame of a porous-metal wick burner. The results showed that the gas temperature using the TFP technique agreed with the thermocouple measurements (25.4 m diameter wire) within 3.5% for temperatures above 1200 K. Additionally, we imaged the entire SiC fiber (with a spatial resolution of 0.14 mm) while it was in the flame using a high resolution CCD camera. The intensity level along the fiber length is a function of the temperature. This results in a one-dimensional temperature profiles at various heights above the burner wick. This temperature measurement technique, while having a precision of less than 1 K, showed data scatter as high as 38 K. Finally, we discuss the major sources of uncertainty in gas temperature measurement using TFP.
Document ID
20030055631
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Struk, Peter (NASA Glenn Research Center Cleveland, OH, United States)
Dietrich, Daniel (NASA Glenn Research Center Cleveland, OH, United States)
Valentine, Russell (Case Western Reserve Univ. Cleveland, OH, United States)
Feier, Ioan (Case Western Reserve Univ. Cleveland, OH, United States)
Date Acquired
September 7, 2013
Publication Date
February 1, 2003
Subject Category
Physics (General)
Report/Patent Number
NAS 1.15:212096
NASA/TM-2003-212096
E-13749
AIAA Paper 2003-853
Meeting Information
Meeting: 41st Aerospace Sciences Meeting and Exhibit
Location: Reno, NV
Country: United States
Start Date: January 6, 2003
End Date: January 9, 2003
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
WBS: WBS 101-32-06
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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