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http://dx.doi.org/10.3795/KSME-B.2004.28.5.569

An Experimental Study on the Lift-off Behavior of Tone-Excited Propane Non-premixed Jet Flames  

Kim, Seung-Gon (순천대학교 기계자동차공학부)
Kim, Kang-Tae (순천대학교 기계자동차공학부)
Park, Jeong (순천대학교 기계자동차공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.28, no.5, 2004 , pp. 569-579 More about this Journal
Abstract
The lift-off characteristics of lifted laminar propane jet flames highly diluted with nitrogen are investigated introducing acoustic forcing with a fuel tube resonance frequency. A flame stability curve is obtained according to forcing strength and the nozzle exit velocity for N2 diluted flames. Flame lift-off behavior is globally classified into three regimes; 1) a weakly varying partially premixed behavior caused by a collapsible mixing for large forcing strength, 2) a coexistent behavior of the edge flame and a weakly varying partially premixed behavior for moderate forcing strength, and 3) edge flame or triple flame behavior for small forcing. It is shown that the laminar lifted flame with forcing affects flame lift-off behavior considerably, and is also clarified that the flame characteristic of flame base is well described with the penetration depth of the degree of mixing, ${\gamma}$$\_$$\delta$/. It is also confirmed that the weakly varying partially premixed flame caused by a collapsible mixing fur large forcing strength behaves as that just near flame blow-out in turbulent lift-off flame.
Keywords
Collapsible Mixing; Edge Flame; Triple Flame; Weakly Varying Partially Premixed Flame; Forcing Strength; Flame Stability curve; Lift-off flame; Mixture Fraction;
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