کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
652490 885022 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phenomena in oscillating downward propagating flames induced by external laser irradiation method
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Phenomena in oscillating downward propagating flames induced by external laser irradiation method
چکیده انگلیسی

Experiments in C2H4/CO2–O2 premixed flames (Le < 1) propagating downwardly in a tube have been conducted to observe transition phenomena from laminar flame front to turbulent flame propagation triggered by external laser irradiation method. To investigate the exact motions of flame tip fluctuation at the initial moment of irradiating CO2 laser, the completely flat flame front is selected as a default flame, which is corresponding to the primary acoustic instability as reported by Searby (1992) [1].According to the time-resolved observation, the flame front exposed to CO2 laser beam shows extremely unstable flame motions in which highly curved flame front towards unburned mixture is subject to diffusive-thermal instability. Then, the sudden enhanced burning state (increased flame surface) caused by flame instability induces the secondary acoustic instability which is akin to the observation in Ref. [1]. In the present study, we report the detailed descriptions of flame fronts on the transient behaviors leading the primary acoustic instability to turbulent motions actively induced by the absorption of externally irradiated CO2 laser beam.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Experimental Thermal and Fluid Science - Volume 34, Issue 8, November 2010, Pages 1290–1294
نویسندگان
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