Important role of the outermost and innermost edge flames on flame extinction was investigated in buoyancy-suppressed non-premixed counter-flow flame with a triple co-flow configuration. The use of He curtain flow pro...
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Important role of the outermost and innermost edge flames on flame extinction was investigated in buoyancy-suppressed non-premixed counter-flow flame with a triple co-flow configuration. The use of He curtain flow produced a microgravity level of 10-2-10-3 g in He-diluted non-premixed counter triple co-flow flame experiments. Flame stability map was presented based on flame extinction and oscillation near extinction limit. The stability map via critical diluent mole fraction with global strain rate was represented by varying outer and inner He-diluted mole fractions. Distinct oscillation regimes existed, and the oscillation and extinction modes were quite different each other in terms of the global strain rate and outer and inner He-diluted mole fractions. The flame extinction modes could be classified into five. The result showed that the edge flame speed was influenced significantly by the conductive heat losses to the inner cold flow mixture or He curtain flow ambience.
The effect of applied electric fields on the spreading flame over slanted Polyethylene (PE) insulated electrical wire was investigated experimentally by varying the AC frequency and voltage. The result showed that the...
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The effect of applied electric fields on the spreading flame over slanted Polyethylene (PE) insulated electrical wire was investigated experimentally by varying the AC frequency and voltage. The result showed that the spread rate of downwardly spreading flame decreased in increase of voltage and frequency, while that of upward flame spread rate exhibited complicated behavior with applied voltage and frequency. Downwardly spreading flame size became smaller in increase of applied voltage and frequency, while the flame leaned toward burnt side. When the flame spread upwardly, the flame size experienced large variation with applied voltage and frequency. Such flames leaned toward unburned side. Based on flame shape and the slanted direction of flame, the flame spread rate could be explained by thermal balance mechanism.
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