利用离子信号计算已燃质量分数  

In-Cylinder Mass Fraction Burned Estimation Using the Spark Plug as Ionization Sensor

作　　者：吴筱敏[1] 李康[1] 魏若男[1] 蒋德明[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《燃烧科学与技术》2007年第5期403-406,共4页Journal of Combustion Science and Technology

基　　金：国家自然科学基金(50276049)

摘　　要：在定容燃烧弹中分别用离子信号和压力对已燃质量分数进行了研究,通过对点火电极附近离子信号的研究表明,其信号分别在点火、火焰前锋与后区中存在3个峰值。利用从点火到达火焰前锋与后区两个峰值的时间间隔以及所测量的压力值分别计算了已燃质量分数,其结果表明,两方法所计算出的已燃质量分数比较一致,当相对空燃比等于1时,已燃质量分数曲线较为陡峭;而当其偏离1时,曲线逐渐平坦,并且起始位置也愈加滞后,选取系数为0.98的计算结果表明,当相对空燃比在0.9～1.1附近时,两者计算结果的最大差值小于10%。This paper is to calculate mass fraction burned, using Ionic Signal and pressure in the constant volume combustion bomb. The Iorie Signal is characterized by ignition and front flame and post flame which have been measured off near ignition poles in the bomb. The mass fraction burned has been calculated by using pressure and durations from ignition to peak of front flame and one of post flame respectively. Its value should agree,using two methods above. Its value increases rapidly when equivalence ratio is 1, The value varied more smoothly and its starting time is postponed when equivalence ratio departs 1. When cofficient is 0.98,the value of mass fraction burned have been shown by using pressure and ionic signal respectively. The results should agree within 10% when equivalence ratio is about 0.9-1.1.

关 键 词：离子信号 压力 已燃质量分数 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]