Effects of heat release in a reacting vortex ring

Shin Juh Chen, Werner Dahm, Gretar Tryggvason

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Flame-vortex interactions provide a carefully controllable environment in which fundamental processes relevant to turbulent diffusion flames can be investigated. Here we present microgravity experiments and numerical simulations of a reacting vortex ring that reveal the dominant effects of heat release on the flow, mixing, and combustion processes. Hydrodynamically scaled ring trajectories showed an initial increase in ring speed due to heat release, followed by a large reduction in speed. The enhanced diffusivities due to heat release do not suffice to explain these observations, which appear to be directly connected with dilatation effects. The observed dependence on the fuel volume introduced in the ring during the initial roll-up phase suggests a simple model that reconciles these observations. Numerical simulations of mixture fraction fields and equilibrium temperatures showed that, consistent with this, volume dilatation due to heat release is the primary mechanism that alters the flow and mixing processes in reacting rings over those in isothermal rings. These simulations support the experimentally observed effects but do not explain differences in flame shape and height that appear to be due to radiative heat losses.

Original languageEnglish (US)
Pages (from-to)515-520
Number of pages6
JournalProceedings of the Combustion Institute
Volume28
Issue number1
StatePublished - 2000
Externally publishedYes

Fingerprint

vortex rings
Vortex flow
heat
rings
flames
Microgravity
Computer simulation
Heat losses
turbulent diffusion
turbulent flames
simulation
diffusion flames
microgravity
Trajectories
diffusivity
Hot Temperature
trajectories
vortices
Experiments
Temperature

ASJC Scopus subject areas

  • Mechanical Engineering
  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Effects of heat release in a reacting vortex ring. / Chen, Shin Juh; Dahm, Werner; Tryggvason, Gretar.

In: Proceedings of the Combustion Institute, Vol. 28, No. 1, 2000, p. 515-520.

Research output: Contribution to journalArticle

Chen, SJ, Dahm, W & Tryggvason, G 2000, 'Effects of heat release in a reacting vortex ring', Proceedings of the Combustion Institute, vol. 28, no. 1, pp. 515-520.
Chen, Shin Juh ; Dahm, Werner ; Tryggvason, Gretar. / Effects of heat release in a reacting vortex ring. In: Proceedings of the Combustion Institute. 2000 ; Vol. 28, No. 1. pp. 515-520.
@article{bbd7f01ed9c74c9893df061d1941bdf4,
title = "Effects of heat release in a reacting vortex ring",
abstract = "Flame-vortex interactions provide a carefully controllable environment in which fundamental processes relevant to turbulent diffusion flames can be investigated. Here we present microgravity experiments and numerical simulations of a reacting vortex ring that reveal the dominant effects of heat release on the flow, mixing, and combustion processes. Hydrodynamically scaled ring trajectories showed an initial increase in ring speed due to heat release, followed by a large reduction in speed. The enhanced diffusivities due to heat release do not suffice to explain these observations, which appear to be directly connected with dilatation effects. The observed dependence on the fuel volume introduced in the ring during the initial roll-up phase suggests a simple model that reconciles these observations. Numerical simulations of mixture fraction fields and equilibrium temperatures showed that, consistent with this, volume dilatation due to heat release is the primary mechanism that alters the flow and mixing processes in reacting rings over those in isothermal rings. These simulations support the experimentally observed effects but do not explain differences in flame shape and height that appear to be due to radiative heat losses.",
author = "Chen, {Shin Juh} and Werner Dahm and Gretar Tryggvason",
year = "2000",
language = "English (US)",
volume = "28",
pages = "515--520",
journal = "Proceedings of the Combustion Institute",
issn = "1540-7489",
publisher = "Elsevier Limited",
number = "1",

}

TY - JOUR

T1 - Effects of heat release in a reacting vortex ring

AU - Chen, Shin Juh

AU - Dahm, Werner

AU - Tryggvason, Gretar

PY - 2000

Y1 - 2000

N2 - Flame-vortex interactions provide a carefully controllable environment in which fundamental processes relevant to turbulent diffusion flames can be investigated. Here we present microgravity experiments and numerical simulations of a reacting vortex ring that reveal the dominant effects of heat release on the flow, mixing, and combustion processes. Hydrodynamically scaled ring trajectories showed an initial increase in ring speed due to heat release, followed by a large reduction in speed. The enhanced diffusivities due to heat release do not suffice to explain these observations, which appear to be directly connected with dilatation effects. The observed dependence on the fuel volume introduced in the ring during the initial roll-up phase suggests a simple model that reconciles these observations. Numerical simulations of mixture fraction fields and equilibrium temperatures showed that, consistent with this, volume dilatation due to heat release is the primary mechanism that alters the flow and mixing processes in reacting rings over those in isothermal rings. These simulations support the experimentally observed effects but do not explain differences in flame shape and height that appear to be due to radiative heat losses.

AB - Flame-vortex interactions provide a carefully controllable environment in which fundamental processes relevant to turbulent diffusion flames can be investigated. Here we present microgravity experiments and numerical simulations of a reacting vortex ring that reveal the dominant effects of heat release on the flow, mixing, and combustion processes. Hydrodynamically scaled ring trajectories showed an initial increase in ring speed due to heat release, followed by a large reduction in speed. The enhanced diffusivities due to heat release do not suffice to explain these observations, which appear to be directly connected with dilatation effects. The observed dependence on the fuel volume introduced in the ring during the initial roll-up phase suggests a simple model that reconciles these observations. Numerical simulations of mixture fraction fields and equilibrium temperatures showed that, consistent with this, volume dilatation due to heat release is the primary mechanism that alters the flow and mixing processes in reacting rings over those in isothermal rings. These simulations support the experimentally observed effects but do not explain differences in flame shape and height that appear to be due to radiative heat losses.

UR - http://www.scopus.com/inward/record.url?scp=84939421455&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84939421455&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:84939421455

VL - 28

SP - 515

EP - 520

JO - Proceedings of the Combustion Institute

JF - Proceedings of the Combustion Institute

SN - 1540-7489

IS - 1

ER -