长直管道燃烧器中离子电流信号的特征分析及其在发动机中的应用  

Analysis of ionic current signal character in long-straight tubular combustor and its application in engine

作　　者：魏若男[1] 

机构地区：[1]西安科技大学机械工程学院,陕西西安710054

出　　处：《西安科技大学学报》2007年第1期89-92,103,共5页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金(50276049)

摘　　要：离子电流法作为一种新型的发动机检测方法已经得到了越来越广泛的应用。本试验用离子电流法,在长直管道燃烧器中对压缩天然气-空气混合气的燃烧特性进行了实验研究。实验发现,在天然气燃烧中,离子电流信号由火焰前锋区和燃烧后区两个峰值部分组成,火焰前锋区的离子主要由H3O+和自由电子组成,而燃烧后区的离子主要由NO+和自由电子组成。同时还发现,在火焰前锋区和燃烧后区内,随着偏置电压的升高,电场力加大,电场荷电作用增强,离子电流会增大。本试验为离子电流法在汽车代用燃料燃烧研究领域中的应用进行了一些基础研究。A new measuring device for engine which using a spark plug as a detecting sensor to detect the ionic current is widely used. An experimental investigation of ionic current signal of CNG/air mixture in the combustor is carried out. In the experiment of the combustor it＇ s found that the signals are both composed of propagating flame front region and postflame region during the combustion process of CNG/air mixture. The H3O^＋ ions and the free electrons are the dominant ions in the propagating flame front region and the NO^＋ ions and the free electrons are the dominant ions in the postflame region. It＇ s also found that in the propagating flame front region and postflame region, with the increase of bias voltage the force of electric field will increase and the electrization action will be enhanced, which will enlarge the ionic current. This experiment provided the basis for the application of ionic current in the alternative fuel combustion research.

关 键 词：发动机 长直管道燃烧器 离子电流 偏置电压 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]