10.1016/j.combustflame.2021.111730
https://zenodo.org/records/6670068
oai:zenodo.org:6670068
J. Benajes
J. Benajes
0000-0002-1653-9188
CMT-Motores Térmicos, Universitat Politècnica de València, Spain
J.M. García-Oliver
J.M. García-Oliver
0000-0002-2676-9681
CMT-Motores Térmicos, Universitat Politècnica de València, Spain
J.M. Pastor
J.M. Pastor
CMT-Motores Térmicos, Universitat Politècnica de València, Spain
I. Olmeda
I. Olmeda
CMT-Motores Térmicos, Universitat Politècnica de València, Spain
A. Both
A. Both
0000-0002-5267-204X
Barcelona Supercomputing Center (BSC), Spain
D. Mira
D. Mira
Barcelona Supercomputing Center (BSC), Spain
Analysis of local extinction of a n-heptane spray flame using large-eddy simulation with tabulated chemistry
Zenodo
2021
2021-09-18
eng
10.1016/j.ijheatmasstransfer.2022.122521
https://zenodo.org/communities/eu
Creative Commons Attribution 4.0 International
This work is focused on the study of flame stabilization and local extinction of a spray flame in an atmospheric non-swirled test rig referred to as the CORIA Rouen Spray Burner. This burner shows a double reaction front structure, with an outer laminar diffusion flame and an inner wrinkled partially-premixed flame undertaking local extinction. This unsteady phenomenon is investigated here using large-eddy simulations with a tabulated chemistry method based on steady and unsteady diffusion flamelets with heat loss. A validation of the numerical simulations is conducted first for the carrier and dispersed phase and good agreement with the experimental data is found for mean and fluctuating quantities. The present results were able to to predict relevant parameters of the flame like the lift-off length and flame shape. Numerical results evidence some intermittency on the OH concentration with the presence of high values of formaldehyde indicating the existence of localized extinction in the leading edge of the flame. A detailed analysis showed the impact of droplets on the reacting layer and the existence of rich pockets quenching the flame front. Further downstream, it was shown that when the scalar dissipation rate reaches high values near the reaction zone, the flame front becomes thinner and wrinkled until it eventually quenches. The numerical results evidence that the applied tabulated chemistry method is capable of capturing the local extinction and re-ignition events occurring in the inner layer.
European Commission
10.13039/501100000780
952181
Center of Excellence in Combustion