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A direct numerical simulation analysis of localised forced ignition in turbulent slot jets of CH4/CO2 blends

Lookup NU author(s): Dr Charles Turquand d'Auzay, Professor Nilanjan ChakrabortyORCiD



This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


© The Author(s) 2023.The early stages of flame evolution following successful localised forced ignition of different CH (Formula presented.) /CO (Formula presented.) blends in a slot jet configuration have been analysed using three-dimensional direct numerical simulations. The simulations have been conducted for three different concentration levels of CO (Formula presented.) in the fuel blend composed of CH (Formula presented.) and CO (Formula presented.) (ranging from 0% to 20% by volume). The effects of CO (Formula presented.) concentration have been analysed based on five different energy deposition scenarios which include situations where the mean mixture composition at the ignitor varies, but not its location in space, whereas other cases represent the scenarios where the mean mixture composition within the energy deposition region remains constant, but its spatial location changes with CO (Formula presented.) concentration. The most favourable region for successful flame development following thermal runaway, from the mixture composition standpoint (i.e. the highest flammability factor), has been found to be displaced close to the nozzle with an increase in CO (Formula presented.) concentration. The flame development following thermal runaway exhibits initial growth of hot gas kernel followed by downstream advection and eventual flame propagation along with radial expansion with a possibility of flame stabilisation irrespective of the level of CO (Formula presented.) concentration. The triple flame propagation has been found to play a key role in the upstream flame propagation and eventual stabilisation. The orientation of the local flame normal plays a key role in the flame stabilisation. The lift off height has been found to increase with increasing CO (Formula presented.) concentration which also adversely affect flame stabilisation for high levels of CO (Formula presented.) concentration.

Publication metadata

Author(s): Turquand d'Auzay C, Chakraborty N

Publication type: Article

Publication status: Published

Journal: International Journal of Spray and Combustion Dynamics

Year: 2023

Volume: 15

Issue: 1

Pages: 33-50

Print publication date: 01/03/2023

Online publication date: 17/03/2023

Acceptance date: 19/12/2022

Date deposited: 04/04/2023

ISSN (print): 1756-8277

ISSN (electronic): 1756-8285

Publisher: SAGE Publications Inc.


DOI: 10.1177/17568277221149471


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