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Role of radicals on MILD combustion inception

Published version
Peer-reviewed

Change log

Authors

Doan, NAK 
Swaminathan, Nedunchezhian 

Abstract

The criterion used to define MILD combustion in non-premixed condition is analysed using Direct Numerical Simulation (DNS) of MILD combustion of methane-diluted air established with internal exhaust gas recirculation. The simulations reveal multiple interacting reaction zones in MILD combustion which are extremely different from conventional combustion. Furthermore, DNS deduced S-curves highlight the role of chemically active species. Specifically, the temperature rise is accompanied with an increase in the scalar dissipation rate of mixture fraction, which is quite contrasting to the classical S-curve from the classical flame theories. This observations is explained on a physical basis.

Description

Keywords

Direct Numerical Simulation (DNS), Exhaust Gas Recirculation (EGR), Moderate or Intense Low-oxygen Dilution (MILD), Flameless combustion, Ignition

Journal Title

Proceedings of the Combustion Institute

Conference Name

Journal ISSN

1873-2704
1873-2704

Volume Title

Publisher

Combustion Institute
Sponsorship
EPSRC (1567652)
Engineering and Physical Sciences Research Council (EP/K025791/1)
Qualcomm European Research Studentship Fund in Technology