TY - GEN
T1 - Experimental studies on spin flames in mesoscale combustion
AU - Xu, Bo
AU - Ju, Yiguang
PY - 2007
Y1 - 2007
N2 - Unsteady propagations of premixed flames in a mesoscale divergent channel were investigated experimentally. The impact of variable cross-section area and the flame-wall coupling on the flame transition between different regimes and the onset of flame instability was examined. A spinning wave with frequency ranged from 20 Hz to 150 Hz was observed and the results showed that the spin frequency was proportional to the flame speed. The wall temperature was controlled using cooling water or hot nitrogen and a transition from spinning wave to stable flame was observed, which proved that the spin was a result of the thermal coupling effect. The stable flame and spin flame could coexist within a bifurcation region caused by the thermal history effect of the wall. The critical flow rate for the onset of spinning wave highly depends on the equivalence ratio and but not the heating power.
AB - Unsteady propagations of premixed flames in a mesoscale divergent channel were investigated experimentally. The impact of variable cross-section area and the flame-wall coupling on the flame transition between different regimes and the onset of flame instability was examined. A spinning wave with frequency ranged from 20 Hz to 150 Hz was observed and the results showed that the spin frequency was proportional to the flame speed. The wall temperature was controlled using cooling water or hot nitrogen and a transition from spinning wave to stable flame was observed, which proved that the spin was a result of the thermal coupling effect. The stable flame and spin flame could coexist within a bifurcation region caused by the thermal history effect of the wall. The critical flow rate for the onset of spinning wave highly depends on the equivalence ratio and but not the heating power.
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M3 - Conference contribution
AN - SCOPUS:34250885154
SN - 1563478900
SN - 9781563478901
T3 - Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
SP - 7019
EP - 7023
BT - Collection of Technical Papers - 45th AIAA Aerospace Sciences Meeting
T2 - 45th AIAA Aerospace Sciences Meeting 2007
Y2 - 8 January 2007 through 11 January 2007
ER -