Experimental investigation of very rich laminar spherical flames under microgravity conditions

S. Jerzembeck, M. Matalon, N. Peters

Research output: Contribution to journalConference article

Abstract

Very rich premixed outward propagating spherical flames of n-heptane (φ = 3.5) and iso-octane (φ = 3.9) spherical flames were experimentally investigated under microgravity conditions at 420 K and initial pressures of up to 30 bar. Inert gases with significantly different molecular weights were used as diluents leading to mixtures with varying effective Lewis numbers. The experimental setup consisted of a spherical closed pressurized vessel that enabled optical access. The experiments were performed in a drop tower under microgravity conditions to prevent the influence of buoyancy on the expanding flames. A Schlieren measurement technique combined with a high-speed CCD camera was used to track the expanding flames. During the entire experiment, the flames were laminar and smooth with no wrinkles due to combustion instabilities observed. This allowed for accurate measurements of the propagation speed and its dependence on stretch, which was then compared to theoretical predictions based a hydrodynamic model for relatively thin flames. The experimental and theoretical results show good agreement with each other. Investigation of such rich mixtures that are close to the upper flammability limit has not been reported before.

Original languageEnglish (US)
Pages (from-to)1125-1132
Number of pages8
JournalProceedings of the Combustion Institute
Volume32 I
Issue number1
DOIs
StatePublished - Jan 1 2009
Externally publishedYes
Event32nd International Symposium on Combustion - Montreal, QC, Canada
Duration: Aug 3 2008Aug 8 2008

Keywords

  • Microgravity
  • Spherical flames
  • Very rich laminar premixed flames

ASJC Scopus subject areas

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

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