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Analysis of flame-flame interactions in premixed hydrocarbon and hydrogen flames

Published version
Peer-reviewed

Type

Article

Change log

Authors

Trivedi, S 
Kolla, H 
Chen, JH 
Cant, RS 

Abstract

© 2020 American Physical Society. Flame-flame interactions are analyzed in twin hydrocarbon and hydrogen turbulent premixed flames. The interactions are identified with the help of Morse theory for critical points. Flame topology in the vicinity of critical points is analyzed and is categorized into four main groups, namely tunnel formation, tunnel closure, reactant pockets, and product pockets. The number of flame-flame interactions is presented in the form of histograms for the different flame cases. The relative frequency of occurrence of each type of topology changes with the turbulence intensity. In hydrocarbon flames, the fraction of product pockets and tunnel formation events increases with turbulence intensity, whereas the fraction of reactant pockets and tunnel closure events decreases. The results for hydrocarbon flames are compared with those for hydrogen flames and the differences are explained both qualitatively and quantitatively. An additional comparison is made between the number of flame-flame interactions observed for a single hydrocarbon flame against the number of interactions for twin hydrocarbon flames. It is found that having two flames in the domain does not significantly alter the number of interactions per flame, therefore indicating that the observed interactions are mainly self-interactions within individual flames.

Description

Keywords

40 Engineering, 4017 Mechanical Engineering, 4002 Automotive Engineering

Journal Title

Physical Review Fluids

Conference Name

Journal ISSN

2469-990X
2469-990X

Volume Title

5

Publisher

American Physical Society (APS)

Rights

All rights reserved
Sponsorship
Engineering and Physical Sciences Research Council (EP/K025791/1)
EPSRC: ARCHER computing resources; Cambridge Trust and Nehru Trust; US funding through Sandia National Laboratories.