Extinction of opposed jet diffusion flames of scramjet fuel components at subatmospheric pressures

Document Type

Conference Proceeding

Publication Date

12-1-2008

Abstract

The effect of atmospheric and subatmospheric pressure on the global extinction strain rate of opposed-jet diffusion flames of gaseous and vaporized liquid fuels in air is quantified. After ignition of a flame between the burner tubes in a vacuum chamber, extinction was approached by gradually reducing the chamber pressure, while the momentum flux - balanced flowrates of the fuel and air jets were held constant. Results for methane, ethylene, and n-heptane/methane and n-heptane/nitrogen mixtures are presented and compared to predictions based on new pressure dependent chemical-kinetic mechanisms concurrently being developed for scramjet engine simulations. The extinction strain rates for all fuels are seen to monotonically increase with pressure in the subatmospheric range explored, and to depend on other factors such as reactant temperature and composition, and burner tube geometry. The numerical simulations are in qualitative agreement with the experimental results, but over predict the extinction strain rates by up to 30%. Copyright © 2008 by the American Institute of Aeronautics and Astronautics, Inc.

Identifier

78149435394 (Scopus)

ISBN

[9781563479373]

Publication Title

46th AIAA Aerospace Sciences Meeting and Exhibit

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