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http://dx.doi.org/10.3795/KSME-B.2002.26.1.133

A Large-scale Structural Mixing Model applied to Blowout of Turbulent Nonpremixed Jet Flames in a Cross Jet Flow  

Lee, Kee-Man (전남도립담양대학 기계공학과)
Park, Jeong (순천대학교 기계자동차공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.26, no.1, 2002 , pp. 133-140 More about this Journal
Abstract
This article presents an application of a large-scale structural mixing model(Broadwell et at. 1984) to the blowout of turbulent reacting cross flow jets. Experimental observations, therefore, aim to identify the existence of large-scale vortical structure exerting an important effect upon the flame stabilization. In the analysis of common stability curve, it is seen that the phenomenon of blowout are only related to the mixing time scale of the two flows. The most notable observation is that the blowout distance is traced at a fixed positions according to the velocity ratio at all times. Measurements of the lower blowout limits in the liftable flame are qualitatively in agreement with the blowout parameter $\xi$, proposed by Broadwell et al. Good agrement between the results calculated by a modified blowout parameter $\xi$'and the present experimental results confirms the important effect of large-scale structure in the stabilization feature of blowout.
Keywords
Cross Jet Flow; Large-scale Structural Mixing Model; Counter-rotating Vortices Pair; Local Mixing Time; Characteristic Chemical Reaction Time; Local Mixing Time; Liftable Flame; Nonlifting Flame; Lower Blowout Limit; Blowout Distance; Blowout Parameter; Velocity Ratio;
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