Dependence of Soot Primary Particle Size on the Height above a Burner in Target Ethylene/air Premixed Flame

Abstract

ABSTRACT McKenna burner providing premixed, laminar, steady flat flame is widely used in the combustion community. The ethylene/air flame with equivalent ratio of 2.34 is considered as one of the target flames for the development and calibration of optical diagnostics of soot particles. In this work, the accurate soot particle sizing in dependence on the height above a burner was performed using the methods of transmission electron microscopy and laser-induced incandescence. It was found, that shielding co-flow gas type and rate together with small variation of the height of stabilization plate in flat premixed flame burner is not influenced on the center flame temperature and on the soot particle size measurement results. Also, the small variation of the velocity of the cold gas in the 5% range at the same equivalence ratio is not influenced by the results of flame temperature and soot particle size measurements. From the other side, the variation of the burner stabilization plate configuration and material of the sintered plate results in the essential differences of the measured values. The accomplished data analysis resulted in a reliable dependence of soot size in the target flame on the height above a burner, which can be applied for validation of soot formation models.