Modeling of NO formation based on ILDM reduced chemistry

Abstract

The reduction of NO formation is a challenging task in view of a clean operation of combustion processes. For the mathematical modeling of turbulent combustion processes, it is desirable to devise reduced schemes for the chemical kinetics which allow a reliable description of kinetically controlled processes such as NO formation. This work focuses on an extension of the method of intrinsic low-dimensional manifolds (ILDM) in order to include NO chemistry, which is well known to be governed by very slow chemical reactions. For the generation of simplified chemical reaction mechanisms, this behavior permits the assumption that these processes as nearly frozen in large parts of the reaction domain. At first, the chemical dynamics of the NO system are analyzed. Based on this analysis, a method is devised which allows the description of NO formation in the context of ILDM-reduced chemistry. Sample calculations of NO formation in CH 4 /air flames verify the approach, and the application in general computational fluid dynamics calculations is discussed.