Abstract
Carbon flower, formed on a tip of burner of the internal combustion engine or the spray combustion system, is a problem of the combustion operation of heavy fuel oil which makes trouble on maintainance and operation.Without concerning of chemical properties of carbon flower, the formation mechanism of carbon flower is studied by means of model experimental apparatus using NaCl solution as liquid sample, and by means of two dimensional nozzle to clarify the flow pattern near the nozzle. The physical conditions, geometrical shapes of combustion chamber near the atomization nozzle, flow pattern of gas and heat transfer to flower, which effected on the formation of flower were examined.The following facts were clarified.1) Tip of the nozzle hole is wetted by solution and heated, the nucleus of flower is generated by evaporation and drying up.2) The annulas nucleus is grown up to longitudinal direction through the process of exudation and drying up by the heat transfer from ambient and conduction.3) The vortex stream which generated near the nozzle entrains considerable number of suspended spray droplets. A part of droplets transported by vortex are collided with flower wall and dried up, therefore the flower grows stratiformly to radius direction.
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