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http://dx.doi.org/10.3795/KSME-B.2011.35.3.309

Study on Heat-Loss-Induced Self-Excitation in Laminar Lifted Jet Flames  

Yoon, Sung-Hwan (Dept. of Energy System Engineering, Pukyong Nat'l Univ.)
Park, Jeong (Dept. of Mechanical Engineering, Pukyong Nat'l Univ.)
Kwon, Oh-Boong (Dept. of Mechanical Engineering, Pukyong Nat'l Univ.)
Kim, Jeong-Soo (Dept. of Mechanical Engineering, Pukyong Nat'l Univ.)
Bae, Dae-Seok (Dept. of Mechanical Engineering, Pukyong Nat'l Univ.)
Yun, Jin-Han (Environmental & Energy Systems Research Division, Korea Institute of Machinery and Materials)
Keel, San-In (Environmental & Energy Systems Research Division, Korea Institute of Machinery and Materials)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.35, no.3, 2011 , pp. 309-319 More about this Journal
Abstract
We experimentally investigated lifted propane jet flames diluted with nitrogen to obtain flame-stability maps based on heat-loss-induced self-excitation. We found that heat-loss-induced self-excitations are caused by conductive heat loss from premixed flame branches to trailing diffusion flames as well as soot radiation. The conductive-heat-loss-induced self-excitation at frequencies less than 0.1 Hz is explained well by a suggested mechanism, whereas the oscillation of the soot region induces a self-excitation of lift-off height of the order of 0.1 Hz. The suggested mechanism is also verified from additive experiments in a room at constant temperature and humidity. The heat-loss-induced self-excitation is explained by the Strouhal numbers as a function of the relevant parameters.
Keywords
Flame Front Propagation; Flame Stability Map; Fuel Concentration Gradient; Heat-Loss-Induced Self-Excitation; Triple Flame Propagation;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
Times Cited By SCOPUS : 0
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