We present recent results toward the quantification of spray characteristics at engine conditions for an eight-hole counter-bored (stepped) GDI injector – Spray G in the ECN denomination. This computational study is characterized by two novel features: the detailed description of a real injector's internal surfaces via tomographic reconstruction; and a general equation of state that represents the thermodynamic properties of homogeneous liquid-vapor mixtures. The combined level-set moment-of-fluid approach, coupled to an embedded boundary formulation for moving solid walls, makes it possible to seamlessly connect the injector's internal flow to the spray. The Large Eddy Simulation (LES) discussed here presents evidence of partial hydraulic flipping and, during the closing transient, string cavitation. Results are validated by measurements of spray density profiles and droplet size distribution.

我们提供了量化八缸沉孔（阶梯式）GDI喷油器的喷油特性的最新结果-ECN面额的喷G。这项计算研究的特点是具有两个新颖的特征：通过层析成像技术对真实喷油器内表面的详细描述；以及代表均匀液体-蒸汽混合物的热力学性质的一般状态方程。结合了水平设定的流体动量方法，再加上用于移动固体壁的嵌入式边界公式，可以将喷射器的内部流量无缝地连接到喷雾上。此处讨论的大涡模拟（LES）提供了部分水力翻转的证据，并且在闭合瞬变过程中出现了弦空化现象。