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Title: Straining and wrinkling processes during turbulence-premixed flame interaction measured using temporally-resolved diagnostics

Abstract

The dynamical processes of flame surface straining and wrinkling that occur as turbulence interacts with a premixed flame were measured using cinema-stereoscopic PIV (CS-PIV) and orthogonal-plane cinema-stereoscopic PIV (OPCS-PIV). These diagnostics provided temporally resolved measurements of turbulence-flame interaction at frame rates of up to 3 kHz and spatial resolutions as small as 280{mu} m. Previous descriptions of flame straining and wrinkling have typically been derived based on a canonical interaction between a pair of counter-rotating vortices and a planar flame surface. However, it was found that this configuration did not properly represent real turbulence-flame interaction. Interactions resembling the canonical configuration were observed in less than 10% of the recorded frames. Instead, straining and wrinkling were generally caused more geometrically complex turbulence, consisting of large groups of structures that could be multiply curved and intertwined. The effect of the interaction was highly dependent on the interaction geometry. Furthermore, even when the turbulence did exist in the canonical geometry, the straining and wrinkling of the flame surface were not well characterized by the vortical structures. A new mechanistic description of the turbulence-flame interaction was therefore identified and confirmed by the measurements. In this description, flame surface straining is caused by coherent structuresmore » of fluid-dynamic strain-rate (strain-rate structures). The role of vortical structures is to curve existing flame surface, creating wrinkles. By simultaneously considering both forms of turbulent structure, turbulence-flame interactions in both the canonical configuration and more complex geometries could be understood. (author)« less

Authors:
;  [1]
  1. Department of Aerospace Engineering, The University of Michigan, Ann Arbor, MI 48109 (United States)
Publication Date:
OSTI Identifier:
21236017
Resource Type:
Journal Article
Journal Name:
Combustion and Flame
Additional Journal Information:
Journal Volume: 156; Journal Issue: 12; Other Information: Elsevier Ltd. All rights reserved; Journal ID: ISSN 0010-2180
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; FLAMES; TURBULENCE; SURFACES; CONFIGURATION; KHZ RANGE; SPATIAL RESOLUTION; STRAIN RATE; VELOCITY; VORTICES; COMBUSTION KINETICS; Turbulent premixed flames; Turbulence-flame interactions; Flame stretch

Citation Formats

Steinberg, Adam M, and Driscoll, James F. Straining and wrinkling processes during turbulence-premixed flame interaction measured using temporally-resolved diagnostics. United States: N. p., 2009. Web. doi:10.1016/J.COMBUSTFLAME.2009.06.024.
Steinberg, Adam M, & Driscoll, James F. Straining and wrinkling processes during turbulence-premixed flame interaction measured using temporally-resolved diagnostics. United States. https://doi.org/10.1016/J.COMBUSTFLAME.2009.06.024
Steinberg, Adam M, and Driscoll, James F. 2009. "Straining and wrinkling processes during turbulence-premixed flame interaction measured using temporally-resolved diagnostics". United States. https://doi.org/10.1016/J.COMBUSTFLAME.2009.06.024.
@article{osti_21236017,
title = {Straining and wrinkling processes during turbulence-premixed flame interaction measured using temporally-resolved diagnostics},
author = {Steinberg, Adam M and Driscoll, James F},
abstractNote = {The dynamical processes of flame surface straining and wrinkling that occur as turbulence interacts with a premixed flame were measured using cinema-stereoscopic PIV (CS-PIV) and orthogonal-plane cinema-stereoscopic PIV (OPCS-PIV). These diagnostics provided temporally resolved measurements of turbulence-flame interaction at frame rates of up to 3 kHz and spatial resolutions as small as 280{mu} m. Previous descriptions of flame straining and wrinkling have typically been derived based on a canonical interaction between a pair of counter-rotating vortices and a planar flame surface. However, it was found that this configuration did not properly represent real turbulence-flame interaction. Interactions resembling the canonical configuration were observed in less than 10% of the recorded frames. Instead, straining and wrinkling were generally caused more geometrically complex turbulence, consisting of large groups of structures that could be multiply curved and intertwined. The effect of the interaction was highly dependent on the interaction geometry. Furthermore, even when the turbulence did exist in the canonical geometry, the straining and wrinkling of the flame surface were not well characterized by the vortical structures. A new mechanistic description of the turbulence-flame interaction was therefore identified and confirmed by the measurements. In this description, flame surface straining is caused by coherent structures of fluid-dynamic strain-rate (strain-rate structures). The role of vortical structures is to curve existing flame surface, creating wrinkles. By simultaneously considering both forms of turbulent structure, turbulence-flame interactions in both the canonical configuration and more complex geometries could be understood. (author)},
doi = {10.1016/J.COMBUSTFLAME.2009.06.024},
url = {https://www.osti.gov/biblio/21236017}, journal = {Combustion and Flame},
issn = {0010-2180},
number = 12,
volume = 156,
place = {United States},
year = {Tue Dec 15 00:00:00 EST 2009},
month = {Tue Dec 15 00:00:00 EST 2009}
}