Gan Yunhua, Jiang Zhengwei, Li Haige, Luo Yanlai, Chen Xiaowen, Shi Yanling, Yan Yuying, Yan Yunfei
School of Electric Power, South China University of Technology, Guangzhou, 510640, China.
Teaching and Training Center for Engineering Basis, South China Agricultural University, Guangzhou, 510640, China.
Sci Rep. 2019 Dec 11;9(1):18791. doi: 10.1038/s41598-019-55223-6.
An investigation on the droplet characteristics of ethanol in small-scale combustors with two different systems was conducted experimentally and theoretically. The classical capillary-mesh electrode arrangement was applied in Type A electrospray system, and for Type B, an additional ring electrode is included. The droplet size and velocity were measured by a Phase Doppler Anemometer. The electric filed intensity was theoretically calculated in the two electrospray systems. Compared with Type A, Type B system has smaller droplet size and velocity in the same spraying mode. Meanwhile the electrospray process in Type B system is more stable than that in Type A with its smaller root mean square velocity. By measuring the spraying current, the average specific charge of the droplets for the two systems was obtained in different spraying modes. And it was found that the addition of the ring electrode can help to increase the droplet charge, which is the fundamental reason for Type B electrospray system to perform better. The corona charge of the droplets was theoretically calculated for the two electrospray systems. It was found that the calculated specific charge generated by corona charging was in good agreement with the experimental results.
对两种不同系统的小型燃烧器中乙醇的液滴特性进行了实验和理论研究。经典的毛细管-网状电极布置应用于A型电喷雾系统，而B型则包括一个额外的环形电极。通过相位多普勒风速仪测量液滴尺寸和速度。在两种电喷雾系统中对电场强度进行了理论计算。与A型相比，B型系统在相同喷雾模式下具有更小的液滴尺寸和速度。同时，B型系统的电喷雾过程比A型更稳定，其均方根速度更小。通过测量喷雾电流，在不同喷雾模式下获得了两种系统液滴的平均比电荷。并且发现添加环形电极有助于增加液滴电荷，这是B型电喷雾系统表现更好的根本原因。对两种电喷雾系统的液滴电晕电荷进行了理论计算。发现电晕充电产生的计算比电荷与实验结果吻合良好。
