摘要
为推动离子电流法用于甲烷燃烧状况的实时检测,提高燃烧精细度,对初始温度为293 K,初始压强为100 kPa,湍流装置转速系数分别为0(层流)和1650(湍流),过量空气系数分别为1.0、1.1、1.2、1.4和1.6时定容燃烧弹内的甲烷/空气预混湍流火焰的离子电流信号进行了测量并加以分析。通过对过量空气系数为1.0、转速系数分别为0和1650时的火焰离子电流信号进行对比,并结合纹影系统记录的火焰传播图像分析可得甲烷/空气预混湍流火焰离子电流信号波动特征形成的原因;通过对转速系数分别为0和1650,过量空气系数分别为1.0、1.2、1.4和1.6时的燃烧压强和离子电流信号进行对比,发现随着过量空气系数减小,湍流火焰和层流火焰的压强信号和离子电流信号的特征值变化一致——峰值变大,峰值时刻提前且离子电流信号上升沿数量增加;当过量空气系数相同时,湍流火焰的峰值大于层流火焰,峰值时刻比层流火焰提前,离子电流信号上升沿数量大于或等于层流火焰;当转速系数为1650,过量空气系数分别为1.0、1.1和1.2时,火焰离子电流信号与火焰传播速度之间存在正线性相关,相关性系数的平方分别为0.9776、0.9383和0.8319。
In order to promote the use of ion current method for real-time detection of methane combustion status and increase the combustion precision,the ion current signal of methane/air premixed turbulent flame in the constant volume combustor was measured and analyzed under the conditions that the initial temperature is 293 K,the initial pressure is 100 kPa,the speed coefficients of turbulence device are 0(laminar flow)and 1650(turbulent),the excess air coefficients are 1.0,1.1,1.2,1.4 and 1.6.By comparing and analyzing the flame ion current signals with the flame propagation images recorded by schlieren system when the excess air coefficient is 1.0 and the rotational speed coefficients are 0 and 1650,the causes resulting in the fluctuation of the ion current signal of methane/air premix turbulent flame are obtained.By comparing the combustion pressure signals and the ion current signals under the conditions that the speed coefficients are 0 and 1650 and the excess air coefficients are 1.0,1.2,1.4 and 1.6,it is found that the changes of eigenvalues of the turbulent flame’s pressure signals and ion current signals are the same as that of the laminar flame with the decrease of excess air coefficient:the larger the peak value is,the earlier the peak time will be,and the number of rising edges of ion current signal is increased.When the excess air coefficients are the same,the peak value of turbulent flame is bigger than that of laminar flame,the peak time is earlier than that of laminar flame,and the number of ion current signal rising edges is greater than or equal to that of laminar flame.It is also found that when the rotational speed coefficient is 1650 and the excess air coefficients are 1.0,1.1 and 1.2,there is a positive linear correlation between flame ion current signal and flame propagation velocity,and the squares of the correlation coefficients are 0.9776,0.9383 and 0.8319 respectively.
作者
张灏
高忠权
高煦尧
寇梦玄
杜增晖
洪流
ZHANG Hao;GAO Zhongquan;GAO Xuyao;KOU Mengxuan;DU Zenghui;HONG Liu(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Key Laboratory of Liquid Rocket Engine Technology,Xi’an 710100,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2021年第5期10-17,共8页
Journal of Xi'an Jiaotong University
基金
中央高校基本科研业务费专项资金资助项目(xzy032020011)
中央高校特色发展资金资助项目(PY3A077)
液体火箭发动机技术重点实验室资助项目。
关键词
离子电流法
甲烷
预混湍流火焰
离子电流信号
ion current method
methane
premixed turbulent flame
ion current signal
