中文摘要：

为了解甲醇自身温度及喷射压力变化对喷雾特性的影响，使用高速摄像机和三维激光相位多普勒颗粒分析仪（PDPA），分别对25、50、60、70、80℃的液态甲醇及喷醇压力为0．3、0．4、0．5MPa时的甲醇喷雾进行了研究。结果表明：随着甲醇温度的升高，喷雾雾化质量提高，甲醇射流液柱减少，液滴索特平均直径（SMD）减小，同时喷雾主射流区向外扩张。另外，喷雾贯穿距和液滴速度均呈先增大后减小的趋势，在70℃时达到最大值。在相同温度下，喷醇压力的增加提高了喷雾液滴速度，有助于贯穿距的增大，同时液滴索特平均直径（SMD）明显减小。因此在柴油机进气预混甲醇燃烧的实际应用中，升高液态甲醇温度至70℃左右，并适当增大喷醇压力至0．5MPa，是一种有效提高气道内甲醇雾化效果的方法。

英文摘要：

In order to understand the spray characteristics with methanol temperature and spray pressure changes, a high speed camera and 3D laser phase Doppler particle analyzer（PDPA） was used to research the methanol spray as fuel temperature was 25℃, 50℃, 60℃, 70℃ and 80℃ respectively, and methanol injection pressure was 0.3 MPa, 0.4 MPa, 0.5 MPa respectively. The results show that, with the increase of methanol temperature, the spray atomization quality was improved, the liquid core of methanol jet was reduced, and the spray droplet Sauter mean diameter （SMD） was decreased, meanwhile, the location of main jet zone was expanded from 7 mm to 10 mm. At the same time, spray penetration and the velocity of droplet was first increased and then decreased with the increase of methanol temperature, and when the methanol temperature reached 70℃ , they both had the maximum value. When the temperature of methanol remained the same, the increase of injection pressure can improve the velocity of spray droplets, which contributed to the increase of penetration, moreover, the droplet Sauter mean diameter （SMD） decreased obviously. Thus, in the application of methanol fumigated diesel engine, it is an effective measure to improve methanol atomization by increasing methanol temperature and injection pressure to around 70℃ and 0.5 MPa, respectively.