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In this study, numerical simulations for the flame structure and NOx formation of counterflow diffusion flame with oxygen-enriched air were made by using the GRI chemical reaction mechanism (NOx included) in order to elucidate the effect of strain rate on reduction of NOx formation. The following conclusions were reached : (1) As the strain rate increases, the maximum heat release rate increases, and the width of high-temperature zone becomes narrow. (2) In the case where the strain rate is small, the thermal NO mechanism is dominant of NO formation, and NO formation by the prompt NO mechanism is negative. (3) As the strain rate increases, NO formation by the prompt NO mechanism increases, and it becomes positive when strain rate exceeds 400s-1. At the same time, since the width of high-temperature zone becomes narrow, that by the thermal NO mechanism decreases, and it becomes smaller than that by prompt NO mechanism for the case where the strain rate exceeds 1200 s-1. The decrease rate of thermal NO is bigger than the increase rate of prompt NO, so that the total NO formation is reduced by the increase in the strain rate.

nihon kikai gakkai ronbunshū. b

Numerical Study on Flame Structure and NOx Formation of Counterflow Flame Using Oxygen-Enriched Air (Effect of Strain Rate on Reduction of NOx Formation)