Abstract
Numerical computations taking into account detailed chemical kinetics are carried out in methane-air laminar premixed combustion and modeled well-stirred staged combustion with dilution air injection. Attentions are paid to the intrinsic processes of NOX formation and destruction and the effect of pressure on NOx formation processes and characteristics. The reaction processes of Zeldovich and prompt NOX formation and destruction are separately considered to clearly distinguish Zeldovich and prompt NOX and elucidate the effects of the interaction between them. In higher pressure and higher temperature levels, NOX formed via Zeldovich mechanism increases along the flow in the premixed flames and dominates in the staged combustion. NOX formed rapidly in the reaction zone via Fenimore mechanism decreases downstream, especially with increasing pressures. The amounts of NOX at pressures of 0.3 to O.TMPa, which differ little from each other, are higher than that at atmospheric pressure. The effects of pressure and equivalence ratio on the NOX emissions observed in Copyright©1998 by authors. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission. the staged-combustion experiments are qualitatively explained by present calculation.
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