The current work demonstrates investigations of the effects of the nozzle hole size and injection pressure on the diesel spray under evaporating condition. Three single hole injectors with hole diameters of 0.101 mm, 0.122 mm and 0.133 mm were used and their injection rate profiles were shaped in a similar manner. Laser Absorption Scattering technique was implemented in the diesel spray experiments to visualize the vapor phase and measure the mixture concentration. Also, the experimental results were validated with the computational approach. The injection rate profile and initial spray trajectory angle are key inputs for the CFD simulation; thus, careful measurements were taken. The injection rate profiles were measured by Zeuch method and based on the start of injection with the High-speed Video camera frame, the 5 kHz Butterworth low pass filter was applied to the injection rate raw signal. Moreover, the near nozzle field microscopic spray imaging experiments were performed to measure the initial spray trajectory angle. The experimental results show that the 0.101 mm hole diameter injector promotes shorter liquid length, longer vapor length, higher evaporation ratio and higher entrained air mass. The computational results show a reasonable qualitative agreement with the experiments; however, a quantitative discrepancy can be noticed.

当前的工作演示了在蒸发条件下对喷嘴孔尺寸和喷射压力对柴油机喷雾的影响的研究。使用了三个孔径分别为0.101 mm，0.122 mm和0.133 mm的单孔进样器，并且以相似的方式塑造了它们的注入速率曲线。在柴油机喷雾实验中实施了激光吸收散射技术，以可视化气相并测量混合物浓度。同时，实验结果也得到了计算方法的验证。喷射速率曲线和初始喷射轨迹角是CFD模拟的关键输入。因此，进行了仔细的测量。通过Zeuch方法测量注射速率曲线，并基于使用高速摄像机框架开始注射的情况，将5 kHz巴特沃思低通滤波器应用于注入速率原始信号。此外，进行了近喷嘴场显微喷雾成像实验，以测量初始喷雾轨迹角。实验结果表明，孔径为0.101 mm的进样器可促进更短的液体长度，更长的蒸汽长度，更高的蒸发比和更高的夹带空气质量。计算结果与实验结果吻合良好。但是，可以发现数量上的差异。更高的蒸发比和更高的夹带空气质量。计算结果与实验结果吻合良好。但是，可以发现数量上的差异。更高的蒸发比和更高的夹带空气质量。计算结果与实验结果吻合良好。但是，可以发现数量上的差异。