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293K
初始压强为100kPa
湍流装置转速系数分别为0(层流)和1 650(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1 650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1 650
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1 650
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0.977 6、0.938 3和0.831 9。
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