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Chemiluminescence signature of premixed ammonia-methane-air flames

机译：Chemiluminescence signature of premixed ammonia-methane-air flames

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This paper reports on the chemiluminescence footprint of premixed ammonia-methane-air flames. Thechemiluminescence spectrum of laminar twin-flames stabilized with a counterflow burner were measuredbetween 200 and 457 nm for large ranges of equivalence ratio (0.60 ≤ φ ≤ 1.30), ammonia fraction(pure methane to pure ammonia), and strain rate (55/s ≤ a ≤ 300/s). Relevant excited radicals were identified,namely, NO ?, OH ?, NH ?, CN ?, CH ?, and CO_2? and evolutions of their chemiluminescence intensitywere analyzed as a function of equivalence ratio, ammonia fraction, and strain rate. These measurementsproduced an unprecedented database on the chemiluminescence of ammonia-methane-air flames, whichcould be used in the future for model validation. A total of 15 ratios of chemiluminescence intensitywere also considered and 5 ratios showing promise for the development of chemiluminescence-basedflame sensors were identified. The CN ?/OH ? ratio is a potential surrogate for equivalence ratio even ifthe ammonia fuel fraction in the fuel blend is not known accurately – as long as it exceeds 0.3 by volume.The CN ?/NO ? ratio is another possible surrogate for equivalence ratio if the ammonia fraction in thefuel blend is below 0.5. The OH ?/CH ? ratio, often used to sense equivalence ratio in hydrocarbons flames,is not recommended for ammonia-methane flames. The NH ?/CN ? ratio is a potential surrogate for theammonia fraction in the fuel blend if equivalence ratio is larger than φ = 0.7 and if the ammonia fractionin the fuel blend is below 0.4. Other ratios may be combined to provide a simultaneous measure ofequivalence ratio and ammonia fraction in the fuel blend with an extended range of validity, for exampleNH ?/OH ? and CN ?/NH ?.

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