Premixed Methane-Air Flame Spectra Measurements Using UV Raman Scattering
作者:
T. S. CHENG,
T. YUAN,
Y. C. CHAO,
C. C. LU,
D. C. WU,
期刊:
Combustion Science and Technology
(Taylor Available online 1998)
卷期:
Volume 135,
issue 1-6
页码: 65-84
ISSN:0010-2202
年代: 1998
DOI:10.1080/00102209808924150
出版商: Taylor & Francis Group
关键词: UV Raman scattering;fluorescence interference;turbulent premixed flames
数据来源: Taylor
摘要:
A spontaneous vibrational Raman scattering technique is developed for simultaneous measurements of temperature and multi-species (C02O2, CO, N2, CH4, H20, H2, and OH) concentrations in premixed methane - air flames. The Raman spectra and spectral background are obtained using a narrowband tunable KrF excimer laser working at 248 nm and a spectrometer combined with an intensified CCO camera. Optimal tuning of the narrowband KrF excimer laser (248.632 nm) for minimization of OH A2Σ_X2П and 02B3Σu- X3Σgfluorescence interference is determined from fluorescence excitation spectra. Laser emission spectra are made to ensure that the optimum wavelength of the laser is within a good locking region. Natural fluorescence spectra (without laser excitation) are used to determine the gate time of the ICCO camera. Measured Raman spectra demonstrate that single-pulse concentration and temperature measurements, with only minimal fluorescence interference, are possible for turbulent premixed methane-air flames. A time-averaged temperature measurement technique is presented that matches the theoretical spectra to the measured N2Stokes Raman spectrum. Methodologies for simultaneous temperature, major species, and OH concentration measurements in turbulent premixed flames are discussed.
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