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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.

Publication 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)
Departments:	School of Science & Technology > Engineering

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