A length-scale analysis of instabilities in high pressure explosion flames,

Lockett, R. D. (2010). A length-scale analysis of instabilities in high pressure explosion flames,. Paper presented at the International Conference on Sustainable Combustion, 06 - 10 June 2010, Canary Islands.

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Abstract

Cellular flame structure in high pressure iso-octane-air explosion flames, obtained in the Leeds combustion bomb, was investigated using Schlieren cinematography and OH laser induced fluorescence. High pressure, stoichiometric, iso-octane-air explosion flames were observed to develop a relatively large wavelength cellular structure (3 mm to 7 mm) as a result of the Darrius-Landau hydrodynamic instability. High pressure, rich, iso-octane-air explosion flames ( = 1.4) were observed to develop a cellular structure with two distinct wavelengths present on the flame surface, a large wavelength cellular structure that was comparable with before (3 mm to 7 mm), and a smaller wavelength cellular structure (~ 1 mm). It is suggested that the small wavelength cellularity is caused by the thermal-diffusive instability. It is further suggested that at high pressures, the hydrodynamic instability and the thermal-diffusive instability decouple from each other, resulting in a dual wavelength cellularity.

Item Type: Conference or Workshop Item (Paper)
Additional Information: Spherical explosion flame, flame instability, hydrodynamic instability, thermal-diffusive instability, cellular flame, cellular wavelength, length-scale, Schlieren cinematography, laser induced fluorescence, laser diagnostics
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: School of Engineering & Mathematical Sciences > Engineering
URI: http://openaccess.city.ac.uk/id/eprint/2066

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