Evolution of surface elements of premixed flames in turbulence

Mohan, A and Dave, HL and Chaudhuri, S (2017) Evolution of surface elements of premixed flames in turbulence. In: 11th Asia-Pacific Conference on Combustion, ASPACC 2017, 10 - 14 December 2017, Sydney.

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Abstract

Direct numerical simulations are performed to generate two different cases of statistically planar turbulent premixed flames. Flame particles, uniformly distributed on a selected isotherm of the flame, are tracked backward in time using Backward Flame Particle Tracking (BFPT) algorithm. Using BFPT, we identify specific regions of an isotherm which would disperse to span the complete surface at a later time. To study the generation process, finite sized triangular elements are created using these flame particles as their vertices and tracked forward in time. A kinematic evolution equation, used in non-reacting turbulent flows, is modified to describe the time evolution of these triangles. Evolution of the triangles is nearly equivalent to that of the portions of the flame surface they represent. This modified equation is used to derive a stretch rate equation for flame surface elements with edge vectors whose mutual orthogonality is not necessarily required. Size and shape of the triangles are measured to quantify flame surface generation process. Based on these observations, the current state of the flame is found to depend on both the instantaneous quantities and flow-flame parameters at an earlier time. Generality of observations is verified by similarity of results from both the DNS cases.

Item Type:	Conference Paper
Publication:	11th Asia-Pacific Conference on Combustion, ASPACC 2017
Publisher:	Combustion Institute
Additional Information:	The copyright for this article belongs to Combustion Institute.
Keywords:	Isotherms, Generation process; Kinematic evolution; Modified equation; Particle tracking; Surface elements; Time evolutions; Triangular elements; Turbulent premixed flame, Combustion
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	25 Jul 2022 09:29
Last Modified:	25 Jul 2022 09:29
URI:	https://eprints.iisc.ac.in/id/eprint/74681

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