半導体レーザ吸収分光法による燃料ガス中の温度およびOH濃度計測

概要

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The in-situ, quantitative profiles of temperature and OH radical concentration in a post-flame region between two-dimensional laminar counter-flow twin flames were measured by wavelength modulation spectroscopy(WMS)using a 1.5μm external cavity diode laser. The second harmonic('2f')signal was generated from absorption by two different overtone rotational-vibrational transitions of OH; the P 11.5(υ′, υ")=(2, 0)(ν_0=6421.354cm_<-1>)and the P5.5(υ′, υ")=(3, 1)(ν_0=6434.613cm_<-1>)trasitions. The absorption occurred in the post flame region between propane-air premixed twin flames stabilized in a two-dimensional laminar counter-flow burner(Tsuji burner)with a 60mm line-of-sight path length. The temperature and OH concentration profiles at different equivalence ratios(φ=0.8 and 0.9)were determined by least-square fitting of theoretical 2f lineshapes to the experimental counterparts and by calculating the ratio of the line intensities('2-line method')of the two different OH transitions. The measured temperature and OH concentration profiles were qualitatively consistent with two-dimensional numerical predictions using an augmented reduced mechanism of propane-air premixed combustion which includes OH as principal species.
一般社団法人日本機械学会の論文
2000-02-25