I204 A STUDY ON MIXTURE FORMATION PROCESS OF DIESEL FUEL SPRAY IN UNSTEADY AND EVAPORATIVE FIELD(Engine spray)

概要

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The focus of this work is placed on the analysis of the mixture formation mechanism in an evaporative diesel spray at impinging and free spray conditions. As an experimental parameter, ambient gas density was selected. This paper investigated the effect of density variation of ambient gas on liquid and vapor-phase inside structure of evaporation diesel spray. Ambient gas density was changed ρ_a=5.0 to 12.3kg/m^3. The experimental results revealed that in the impinging spray behavior of lower ambient gas density, the spray spreading in the radial direction is larger than that for gases having higher density, because the drag force decreases due to ambient gas. On the other hand, in the case of free spray, with increasing ambient gas density, the liquid-phase length is getting short due to increase in drag force of ambient gas. Then, in order to examine the homogeneity of vapor-phase fuel/ambient gas mixture in a spray, image analysis was carried out based on the non-dimensional entropy method of statistical thermodynamics.
社団法人日本機械学会の論文
2000-10-01