Coupling between fluid dynamics and combustion in a laminar vortex ring

Shin Juh Chen, Werner Dahm, Grétar Tryggvason

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Flame-vortex interactions are critical to the understanding of turbulent reacting flows. The impact of exothermicity on reacting vortex rings is investigated both numerically and experimentally to assess the dominant effect of heat release. Experimental observations of ring trajectories show an initial increase in ring speed in the early stage, followed by a large reduction in speed. It is found numerically that dilatation due to combustion heatrelease is the dominant effect over enhanced diffusivities in a reacting vortex ring. Increasing fuel volume in the ring beyond a critical limit, obtained from a simple model, actually decreases the amount of heatrelease during the early stage of the interaction. In addition, the increase in ring circulation led to a decrease in ring speed in the early stage of formation. Nitrogen dilution of the propane fuel reduces the flame luminosity and burnout time, as well as changes in details of the formation and dissipation of the luminous cap, with little change in the primary structure or dynamics of the interaction. The numerical simulations were successful in explaining most of the experimental observations, however, differences in flame structure and ring dynamics attributed to radiative heat loss were inconclusive when radiative heat loss was modeled as an overall decrease in flame temperature.

Original languageEnglish (US)
Title of host publication38th Aerospace Sciences Meeting and Exhibit
StatePublished - 2000
Externally publishedYes
Event38th Aerospace Sciences Meeting and Exhibit 2000 - Reno, NV, United States
Duration: Jan 10 2000Jan 13 2000

Other

Other38th Aerospace Sciences Meeting and Exhibit 2000
CountryUnited States
CityReno, NV
Period1/10/001/13/00

Fingerprint

vortex rings
fluid dynamics
Fluid dynamics
vortex
Vortex flow
combustion
Heat losses
rings
flames
propane
turbulent flow
Propane
heat
diffusivity
Dilution
Turbulent flow
dissipation
Luminance
dilution
trajectory

ASJC Scopus subject areas

  • Space and Planetary Science
  • Aerospace Engineering

Cite this

Chen, S. J., Dahm, W., & Tryggvason, G. (2000). Coupling between fluid dynamics and combustion in a laminar vortex ring. In 38th Aerospace Sciences Meeting and Exhibit

Coupling between fluid dynamics and combustion in a laminar vortex ring. / Chen, Shin Juh; Dahm, Werner; Tryggvason, Grétar.

38th Aerospace Sciences Meeting and Exhibit. 2000.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Chen, SJ, Dahm, W & Tryggvason, G 2000, Coupling between fluid dynamics and combustion in a laminar vortex ring. in 38th Aerospace Sciences Meeting and Exhibit. 38th Aerospace Sciences Meeting and Exhibit 2000, Reno, NV, United States, 1/10/00.
Chen SJ, Dahm W, Tryggvason G. Coupling between fluid dynamics and combustion in a laminar vortex ring. In 38th Aerospace Sciences Meeting and Exhibit. 2000
Chen, Shin Juh ; Dahm, Werner ; Tryggvason, Grétar. / Coupling between fluid dynamics and combustion in a laminar vortex ring. 38th Aerospace Sciences Meeting and Exhibit. 2000.
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