高电压技术2013，Vol.39Issue(1)：135-140,6.DOI:10.3969/j.issn.1003-6520.2013.01.020
生物柴油雾滴静电破碎机理与实验研究
Theoretical and Experimental Investigation on Mechanism of Biodiesel Droplets Electrostatic Breakup
摘要
Abstract
In order to achieve an effective atomization of biodiesel, droplet breakup in electrostatic field and its mechanism were investigated based on mathematic models and experiment. A droplet electrostatic breakup model was founded by adopting Rayleigh instability conditions, then the main factor affecting the breakup of biodiesel and the specific charges under different influential factors were obtained. The droplets size distribution and specific charges under different voltages were measured by a phase Doppler particle analyzer (PDPA) and the Faraday cage method, respectively. Theoretical analysis and experimental data indicate that the Rayleigh breakup occurs due to surface charges (including net and non-excess polarization charges) to meet Rayleigh instability conditions, and simultaneously the droplets deform and break into much finer droplets to maintain Taylor stability due to polarization forces in electrostatic field. According to theoretical analysis, the key factors affecting the droplets breakup include electrification charge, droplets velocity, and temperature, thus heating, increasing jet velocity and specific charges are considerable methods to overcome the difficulty in biodiesel droplets atomization due to the high viscosity of biodiesel. In experiments, the typical value of specific charge is within 10-9～10-8 C/g, which is much lower than the calculated value 10-6 C/g. The reasons of this discrepancy include the consumption of electrostatic energy for droplets breakup, the increasing non-excess polarization charges on the droplets surface, the droplet polarization in electrostatic field, the aerodynamic forces assisting atomization, and some nature characteristics of biodiesel.关键词
生物柴油/静电雾化/静电破碎/荷质比/雾滴粒径/PDPAKey words
biodiesel/ electrostatic atomization/ electrostatic breakup/ electrostatic field/ specific charges/ droplets diameter/ PDPA引用本文复制引用
王贞涛,王军锋,顾利平..生物柴油雾滴静电破碎机理与实验研究[J].高电压技术,2013,39(1):135-140,6.基金项目
国家自然科学基金(51106064 （）
51006047) （）
中国博士后科学基金(2012M511214) （2012M511214）
江苏省博士后基金(1101149C) （1101149C）
江苏高校优势学科建设工程项目(苏教财[2011]8号). （苏教财[2011]8号）
