Abstract
This paper aims to understand the effects of coflow oxygen content on the lift-off height of autoignited jet flame and develop a lift-off height prediction model. A jet-in-coflow burner was used to performed autoignition experiments in hot air coflow with different oxygen contents. At a fixed oxygen content, as the fuel jet velocity increases, two types of autoignited flames were observed: (1) nozzle-stabilized flame (NS); (2) lifted flame (LF). As the oxygen content increases, it takes a larger fuel jet velocity for the transition from NS to LF and the transition from LF to blow-out. For a fixed fuel jet velocity, the lift-off height decreases significantly with increasing oxygen content and is more sensitive to the oxygen content at oxygen-lean conditions. Based on the modified large-scale mixing model, a lift-off height model was developed that considers the combined effect of small-scale strain and large-scale mixing.
Published Version
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