Two-Dimensional Temperature Field Measurements Using a Molecular Filter Based Technique
作者:
GREGORYS. ELLIOTT,
NICK GLUMAC,
CAMPBELLD. CARTER,
ABDOLLAHS. NEJAD,
期刊:
Combustion Science and Technology
(Taylor Available online 1997)
卷期:
Volume 125,
issue 1-6
页码: 351-369
ISSN:0010-2202
年代: 1997
DOI:10.1080/00102209708935663
出版商: Taylor & Francis Group
关键词: Temperature measurement;Rayleigh scattering;Filtered Rayleigh scattering;2-D imaging;thermometry
数据来源: Taylor
摘要:
Filtered Rayleigh Scattering (FRS) has been investigated to determine the feasibility of the technique to obtain instantaneous two-dimensional temperature measurements in reacting flows. The laser frequency, of an injection seeded Nd:YAG laser, is tuned to an absorption line of iodine which is contained in an optical cell. The iodine filter is placed in front of an intensified CCD camera recording the scattered light. Background scattering from solid surfaces and particles is strongly absorbed by the iodine, while much of the Doppler broadened Rayleigh scattering is transmitted by the filter. The gas temperature can then be deduced from the measured transmission of the molecular Rayleigh scattering. Two different premixed flames were investigated, a hydrogen-air flame created using a Hencken burner and a methane-air flame. The accuracy of the FRS measurements was investigated by comparing FRS-derived temperatures with calculated values and temperatures recorded with coherent anti-Stokes Raman spectroscopy. For the hydrogen-air flames, the FRS method gave temperatures within 2% of the expected value (from measurement and/or calculation). Methane-air flames were investigated to demonstrate the effectiveness of FRS to measure temperatures near surfaces (within 300 μm) and to obtain “large field” two-dimensional temperature information in a buoyantly driven flame. A detailed uncertainty analyses is provided to show the strengths and limitations of the FRS technique for temperature measurements in reacting flows.
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