It is well known that nozzle internal geometries affect the characteristics of diesel spray and combustion. However, despite a number of studies, the effects are difficult to generalize. It is also not clear which spray features are more important for combustion than others. To investigate these subjects, a comprehensive dataset on diesel spray combustion was obtained with 20 variations of multi-hole injector nozzle. The 20 variations had different combinations of orifice diameter, orifice length, sac length and orifice hub-to-tip ratio, which cover the large range of existing production injectors. Vapor penetration, vapor width, ignition delay time, ignition distance and lift-off length were quantified using schlieren and excited-state hydroxyl radical (OH*) chemiluminescence imaging for an isolated plume emerging from these different nozzles. The experiments were conducted with Japanese diesel fuel in a constant-volume diesel spray combustion facility at Sandia National Laboratories. The results were analyzed with response surface and Lasso regression analysis to identify significant design factors for spray combustion. Orifice diameter has large effects on spray combustion. Orifice length, sac length, orifice hub-to-tip ratio and their interactions have effects on spray combustion, but each effect is smaller than the effect of orifice diameter. Vapor penetration is a significant design factor for ignition delay time, ignition distance and lift-off length, while vapor width is not. Lift-off length is well-explained by ignition distance and ignition delay time. Ignition distance should be taken into consideration as a significant design factor for lift-off length as well as ignition delay time.

众所周知，喷嘴的内部几何形状会影响柴油喷雾和燃烧的特性。但是，尽管进行了许多研究，但效果很难一概而论。还不清楚哪个喷雾特征比其他喷雾特征对燃烧更重要。为了研究这些主题，获得了20种不同的多孔喷油嘴的柴油喷雾燃烧综合数据集。这20个变型具有孔直径，孔长度，囊长和孔毂顶比的不同组合，涵盖了现有生产注射器的广泛范围。蒸气渗透，蒸气宽度，点火延迟时间，点火距离和升起长度使用席勒烯和激发态羟基自由基（OH *）化学发光成像对从这些不同喷嘴冒出的孤立羽状物进行定量。实验是在桑迪亚国家实验室（Sandia National Laboratories）的恒定体积柴油喷雾燃烧设备中使用日本柴油进行的。通过响应面和Lasso回归分析对结果进行分析，以确定喷雾燃烧的重要设计因素。孔口直径对喷雾燃烧有很大影响。孔口长度，囊长，孔口毂顶比及其相互作用对喷雾燃烧有影响，但每种影响都小于孔口直径的影响。蒸气渗透是影响点火延迟时间，点火距离和提离长度的重要设计因素，而蒸气宽度则不是。升程长度可以通过点火距离和点火延迟时间很好地解释。