Abstract
Highly preheated air combustion by heat regeneration has been paid much attention in recent combustion industries. In this study, the effects of preheated air temperature and stretch rate on the formation of nitric oxide in flames were studied by using numerical calculation of laminar counter-flow flames. To exclude effects of other things, oxidizer was diluted by nitrogen. Results show that in the case of low stretch rate the effects of preheated air temperature, oxide mole fraction, and the highest temperature of flames on emission index of NOx were greater than the case of high stretch rate. It is also comforted that the highest temperature of flames and emission index were lower in the case of higher stretch rate.
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