Abstract
Since fuel spray has spatiotemporally inhomogeneous structure, spray ignition is treated as probabilistic phenomenon. Consequently, it is aimed to clarify the effect of inhomogeneity, especially spatial inhomogeneity, on ignition probability. Methanol mono-dispersed spray/Vapor/Air mixture was ignited by a discharged ignition system. A large number of ignition tests were carried out for two conditions, which time-average fuel spray concentrations are different but spatial inhomogeneities of both sprays different. Results obtained from these ignition tests were compared each other under same instantaneous spray concentration. Spatial inhomogeneity of fuel spray is reprenented by inhomogeneity index, which represents the relative intensity of inhomogeneity to that of random state. As a result, ignition probability is different though instantaneous concentrations are same since spatial inhomogeneity of fuel spray is different in both conditions. In addition, the maximum value of inhomogeneity index of both conditions were compared each other. The maximum value of successful ignition cases become almost same. This fact suggests the existence of optimum intensity of spatial inhomogeneity for ignition.
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