Abstract
The fuel/air ratio (FAR) in a methane-air Hencken flame at pressures of 1–5 bar is measured using the chemiluminescence-based method. Emission spectra are used to investigate the effects of pressure on the (308 nm), (430 nm), and (500 nm) emissions and the effect on equivalence ratio determination from the ratios of these emission peaks. Both and ratios are linear to FAR at atmospheric pressure. At elevated pressures, remains roughly linear to FAR, while becomes highly nonlinear. There are significant spectral contributions from continuum radiation at higher pressures, likely due to increasing soot production. Therefore, while it is a truly passive and nonintrusive diagnostic method, the use of chemiluminescence for FAR determination at high pressures could be limited. Possible improvements to the measurement setup and future studies are discussed.
© 2019 Optical Society of America
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