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Quantifying acetylene mole fraction in rich flat laminar premixed C2H4/air flames using mid-infrared polarization spectroscopy
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Quantifying acetylene mole fraction in rich flat laminar premixed C2H4/air flames using mid-infrared polarization spectroscopy
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Quantifying acetylene mole fraction in rich flat laminar premixed C2H4/air flames using mid-infrared polarization spectroscopy
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Journal Article
Quantifying acetylene mole fraction in rich flat laminar premixed C2H4/air flames using mid-infrared polarization spectroscopy
2023
Overview
Mid-infrared laser polarization spectroscopy (IRPS) has been applied to measure the mole fraction of acetylene in rich premixed laminar C
2
H
4
/Air flat flames at equivalence ratios (
Φ
) of 1.7, 2.1, and 2.3, and under atmospheric pressure. The detection was conducted by probing the ro-vibrational P(19) transition at ~ 3.1 μm. The total collisional broadening coefficient of C
2
H
2
was approximately 0.074 cm
−1
atm
−1
and varied within a range of 0.5% under different flame conditions, which made the effect of linewidth not obvious in the CH
4
/air flame. The calculated mole fraction of C
2
H
2
, using the Chemkin model, at
Φ
= 1.3 and 1.5 was used to calibrate the recorded IRPS signal intensities at different Height Above Burner (HAB). A single scaling factor was then used to quantify the measured C
2
H
2
at highly sooting conditions,
Φ
= 1.7, 2.1, and 2.3, with a Limit of Detection (LoD) of 35 ± 5 ppm. The first observed C
2
H
2
mole fraction appeared at HAB of 3 mm and measured as 2003 ppm, 2217 ppm, and 2495 ppm, for
Φ
= 1.7, 2.1, and 2.3, respectively. The mole fraction increased as the HAB increased to reach the maximum value of 2296 ppm, 2807 ppm, and 3478 ppm, for
Φ
= 1.7, 2.1, and 2.3, respectively, up to HAB of 5 mm. It was observed that the C
2
H
2
mole fraction reaches a plateau region at HAB of ~ 8 mm. The production of C
2
H
2
has been observed to be subject to a critical gas temperature of 1400 ± 30 K. The critical soot inception temperature, where the first incepted soot particles are observed, is the same as the gas temperature where
χ
C
2
H
2
max
was detected, namely at 1500 ± 30 K. These measurements and calibration procedure demonstrate a plausible technique to probe other flames and to better understand soot inception and its correlation with C
2
H
2
.
