Markstein numbers and unstretched laminar burning velocities of wet carbon monoxide flames

M. I. Hassan, K. T. Aung, G. M. Faeth

Research output: Contribution to conferencePaperpeer-review

7 Scopus citations

Abstract

Effects of positive flame stretch on the laminar burning velocities of wet carbon-monoxide/air flames at normal temperature and pressure were studied both experimentally and computationally. Measurements and numerical simulations considered outwardly-propagating spherical laminar premixed flames having both stable and unstable preferential-diffusion behavior. Test conditions included concentrations of hydrogen in the fuel mixture of 3-50% by volume, fuel equivalence ratios of 0.6-5.0, Karlovitz numbers of 0-0.91 and laminar burning velocities corrected to unstretched (plane) flame conditions of 130-1730 mm/s. Both measured and predicted ratios of unstretched (plane) to stretched laminar burning velocities varied linearly with Karlovitz numbers, yielding Markstein numbers in the range -6.5 to 7.6, reaching largest values near limits for the largest hydrogen concentrations in the fuel mixture. Effects of stretch on laminar burning velocities were modest at low hydrogen concentrations but approached earlier observations for hydrogen/air flames as hydrogen concentrations increased. Present and earlier stretchcorrected measurements of the laminar burning velocities and Markstein numbers for unstretched (plane) flames were generally in good agreement, aside from some exceptions at conditions where Markstein numbers were large. Predicted and measured unstretched laminar burning velocities and Markstein numbers were in fair agreement, using a chemical reaction mechanism due to Kim et al. (1994); nevertheless, additional development of the mechanism is needed to improve predictions of Markstein numbers over the test range, and unstretched laminar burning velocities at large hydrogen concentrations and fuelequivalence ratios.

Original languageBritish English
DOIs
StatePublished - 1996
Event34th Aerospace Sciences Meeting and Exhibit, 1996 - Reno, United States
Duration: 15 Jan 199618 Jan 1996

Conference

Conference34th Aerospace Sciences Meeting and Exhibit, 1996
Country/TerritoryUnited States
CityReno
Period15/01/9618/01/96

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