INFRA-RED STUDY OF FLAME STRUCTURE.
IMPERIAL COLL OF SCIENCE AND TECHNOLOGY LONDON (ENGLAND) DEPT OF CHEMICAL ENGINEERING AND CHEMICAL TECHNOLOGY
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A burner and optical systems have been developed which make it possible to traverse the structure of lean flat flames by an infra-red beam, without intervening windows, and record the absorption at various wavelengths as a function of gas temperature. It was found that 1 a flame can be used as a stationary temperature distribution at constant pressure for the purpose of calibrating infrared absorption, providing the species examined is an inert component and remains in equilibrium with local temperature 2 free radicals and other unstable species are not present in lean limit flames in sufficient concentration to be detectable in flames of about 12 cm optical path 3 the method can be used to follow the disappearance, or first appearance, of major species such as reactants, products or stable intermediates 3 although it is possible to calibrate absorption quantitatively for the determination of species concentration under equilibrium conditions, such calibrations cannot be applied to the species while it is undergoing reaction.
- Combustion and Ignition