Aspden AJ

Dasgupta D

Day MS

Lieuwen TC

Sun W

\ua9 2018 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. This paper investigates turbulence-chemistry interactions for n-dodecane-air flame, particularly the degree to which fuel oxidation pathways change in turbulent flames relative to their laminar values. It analyzes the lean (Φ=0.7) n-dodecane-air flame DNS database from Aspden et al. (Proc. Combust. Institute, 36 (2017) 2005-2016). The roles of dominant reactions to heat release and radical formation/consumption are analyzed at various turbulence intensities and compared with stretched flame calculations from a counterflow flame. For turbulent flames, the alteration of the chemical pathways with increasing turbulence is quite similar to response of stretched flames to increased values of positive mean stretch. The global analysis shows very limited change with increasing turbulence intensities. However, a local analysis reveals some changes in chemistry. Reactions with peak activity in the low temperature (i.e. below 1200K) activity shift towards higher temperatures suggesting a shift in chemistry towards the reaction zone; this is an important result as prior work with lighter fuels have shown the opposite behavior. All other reactions show a smaller spread in the temperature space with increasing turbulence intensities, also suggesting reduced low temperature activity

Investigation of turbulence effects on chemical pathways for <em>n</em>-dodecane

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