کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
167630 457874 2009 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Counter-gradient transport in the combustion of a premixed CH4/air annular jet by combined PIV/OH-LIF
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Counter-gradient transport in the combustion of a premixed CH4/air annular jet by combined PIV/OH-LIF
چکیده انگلیسی

A combination of PIV/OH laser induced fluorescence technique is used to measure the conditional – burned and unburned – gas velocity in a turbulent premixed CH4/air annular bluff-body stabilized burner. By changing the equivalence ratio from lean to almost stoichiometric, the energy budget of the recirculating region anchoring the flame is altered in such a way to increasingly lift the flame away from the jet exit. The overall turbulence intensity interacting with each flame is thus systematically varied in a significant range, allowing for a parametric study of its effect on turbulent scalar transport under well controlled conditions, always well within the flamelet regime. The component of the flux normal to the average front is found to reverse its direction, confirming the Bray number as a good indicator of gradient/counter-gradient behavior, once the actual incoming turbulence level felt locally by the flame is assumed as the proper control parameter.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Combustion and Flame - Volume 156, Issue 3, March 2009, Pages 608–620
نویسندگان
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