中文摘要：

采用2万帧/s高速数码相机对生物柴油单液滴静电雾化现象进行微距拍摄,对比分析了荷电与非荷电时液滴的变形以及运动情况,获得了不同电压下液滴的雾化模式以及锥射流模式中Taylor-cone的锥长和锥角的变化。结果表明：液滴粒径随着电压增大而减小,下落速度随着电压增大而增大;荷电后同一型号毛细管中生物柴油的变形率大于水,生物柴油小液滴的变形程度大于大液滴;随着电压增大,液滴依次经历滴状模式、过渡阶段、锥射流模式、多股射流模式,在锥射流中Taylor-cone的锥长与电压呈正比,锥角与电压呈反比;电导率对液滴运动有影响,电导率小的液滴基本沿毛细管轴向运动,而电导率大的液滴既有轴向运动又有径向运动。

英文摘要：

Electrostatic atomization phenomenon for single droplet was shot based on high-speed video camera with tens of thousands of frames per second.The deformation of the charged and non-charged droplets,as well as their movements were compared and analyzed.The atomization mode at different voltages and the Taylor-cone length and cone angle changes under cone-jet mode were obtained.The results showed that droplet size decreased when the voltage increased,whereas its velocity increased with the voltage increasing.Biodiesel has bigger deformation rate than water under the same capillary,and the small droplet of biodiesel has larger deformation degree than big one.As the voltage increased,droplet went through dripping mode,the transition phase,cone-jet mode and multi-jet mode.In cone-jet mode,the cone length of Taylor-cone became direct ratio to the voltage,whereas the cone angle inversed to it.Conductivity had impact on the droplet movement,droplets with smaller conductivity moved along with the capillary axis,while droplets with bigger conductivity had both axial movement and radial movement.