Comparison of the Experimental Structure of an Ammonia Seeded Rich-Hydrogen-Oxygen-Argon Flame with the Calculated Ones Along Several Reaction Mechanisms

Abstract

Using a mass spectrometry associated with molecular beam sampling (MBMS), the complele structure of a NH₃ seeded, rich H₂/O₂/Ar flat flame (𝛗 = 1.91) has been determined. A recent simplified model for the ammonia oxidation has been tested and accounts for the experimental results. In the investigated temperature range (500-1200 ) current existing models do not predict well the experimental results and the discrepancies can be ascribed to the estimates of the rate coefficienls of the processes NH + O₂,NH₁ + HandNH + NO. This experimental work performed under rich conditions reinforces the validity of the simplified model already tested in lean and stoichiometric conditions