Homogenous Nucleation Theory for Soot Formation

概要

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The sooting process occurring during combustion of a mixture of gaseous fuel and air is described by a theory based on homogeneous nucleation. This theory includes the concepts of carbon cluster kinetics and partial equilibrium to permit description of a slow chemical step such as the thermal decomposition of raw fuel. The likelihood of homogeneous nucleation in sooting is shown from a thermodynamical aspect taking the Gibbs free energy of each intermediate product into consideration. The predicted results of the proposed theory are compared with results obtained from shock-tube experiments and steady-flow reactor experiments. It is suggested that clustering may result in the rapid formation of soot, despite very low carbon vapor concentration, and that there is a cluster class above which the soot mass yield remains unchanged. Furthermore, it is suggested that the strong temperature dependence of soot yield in a very fuel-rich mixture stems from a low carbon vapor concentration at lower temperatures and a high rate of declustering reactions at higher temperatures.
一般社団法人日本機械学会の論文
1989-05-15