电极结构对离子电流影响的试验研究  

Experimental Study on Influence of Electrode Geometric Parameters on Ionization Current

作　　者：髙忠权 吴筱敏[1] 向往[1] 宋轶明[1] 皮敏[1] 黄佐华[1] 

机构地区：[1]西安交通大学动力工程多相流国家重点实验室,陕西西安710049

出　　处：《内燃机学报》2008年第4期364-368,共5页Transactions of Csice

基　　金：陕西省自然科学基金项目(2006E142);国家重点基础研究计划项目(2007CB210006)

摘　　要：在定容燃烧弹中,通过将圆盘布置在正、负电极的不同位置上,对天然气—空气混合气燃烧产生的离子电流进行了测量,并将高速摄影仪在燃烧过程中拍摄的纹影照片与相应的离子电流进行了分析对比,结果表明:圆盘位置等参数不影响离子电流曲线的形态,曲线均存在点火、前锋区、后焰区3个阶段,可以完整的体现燃烧信息,但圆盘与火核中心的距离有一最佳值;圆盘布置在正电极对离子电流的影响大于布置在负电极;圆盘位置不影响前锋区离子电流峰值出现时间,但影响该值的大小。The ionization current generated during the combustion of CNG （compressed natural gas）/air mixture was measured by the electrodes on which disks were attached in a constant volume combustion bomb. Schlieren pictures taken by a high-speed camera were compared with the corresponding ionization currents. The results showed that the position of the disks attached on the electrodes does little affect on the profiles of the ionization current curves. All curves include the information of the ignition, the front-flame and the post-flame stages and can fully reflect the main combustion process. Optimal distance is existed between the two disks. The anode gives more influence on the ionization current than the cathode. The disk position affects the value of ionization current, but it does little affect the occurrence timing of the front-flame current.

关 键 词：电极几何参数 离子电流 圆盘位置 燃烧 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]