In gasoline direct injection (GDI) engines, plume-plume interaction usually occurs when the superheated fluid discharges from multi-hole injectors. To mitigate plume interaction for further utilizing the merits of flash-boiling phenomena, it is essential to obtain the criteria of plume interaction and their effects on flashing spray characteristics. An 8-hole injector from Engine Combustion Network (ECN) is used to obtain the plume interaction criteria. Iso-octane, pentane, hexane, and their blends were tested, and experiments using the method of diffused back illumination (DBI) were conducted in a constant volume chamber (CVC). The new nominal parameter calculated by the pressure-enthalpy graph was introduced to analyze the spray morphologies and macroscopic characteristics. The new criteria considering fuel properties, injector geometries, and ambient pressure were obtained and validated by mono- /multi-component fuels. Based on the new criteria, spray characteristics in various stages of plume interaction are investigated. The tunning point of tip penetration and spray angles occur at the critical point defined by the new criteria in all tested fuels.

在汽油直喷（GDI）发动机中，当过热流体从多孔喷油器排出时，通常会发生羽流与油烟的相互作用。为了减轻羽流相互作用以进一步利用闪蒸现象的优点，必须获得羽流相互作用的标准及其对闪蒸特性的影响。来自发动机燃烧网络（ECN）的8孔喷射器用于获得羽流相互作用标准。测试了异辛烷，戊烷，己烷及其混合物，并在定容室（CVC）中使用了扩散背照（DBI）方法进行了实验。引入了由压焓图计算出的新标称参数，以分析喷雾的形态和宏观特性。考虑燃油特性，喷油嘴几何形状，通过单/多组分燃料获得并验证了环境压力。基于新标准，研究了羽流相互作用各个阶段的喷雾特性。在所有测试燃料中，尖端穿透和喷雾角度的变化点出现在新标准定义的临界点上。