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FLAME STABILITY OF PROPANE-AIR PREMIXED COMBUSTION IN HEAT-RECIRCULATION MICRO-COMBUSTORS

Junjie Chen, Wenya Song, Xuhui Gao, Longfei Yan, Deguang Xu
Frontiers in Heat and Mass Transfer (FHMT) 7 - 3 (2016)


Abstract


The flame stability of single-pass heat-recirculation micro-combustors was investigated using computational fluid dynamics and compared to singlechannel micro-combustors with respect to critical heat loss coefficient and total power loss. The effect of wall thermal conductivity was also explored. The simulations show that heat recirculation profoundly affects blowout because of preheating of the cold incoming gases but has only minimal effect on extinction. In the limit of low-conductivity walls, the heat-recirculation micro-combustor is much more stable than the single-channel microcombustor. Under certain conditions, the heat recirculation micro-combustor can operate with room-temperature inlet and outlet streams and moderate outer wall temperatures while exhibiting high thermal and combustion efficiency.


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DOI: http://dx.doi.org/10.5098/hmt.7.3

ISSN: 2151-8629