管道预混火焰动态响应的分析和测量

摘要

The dynamic response of premixed ducted flame to flow disturbance is analyzed in this paper. For linear fluctuations, the time evolution of flame surface can be determined analytically. Meanwhile, the influence of different equivalence ratio and forced oscillation frequencies on the fluctuation of flame wrinkle is measured by intensified CCD detectors and dynamic pressure sensors simultaneously with the help of the phase-locked method. Both the analytical and the experimental results show that the above parameters are closely related to the number and amplitude of flame wrinkle.%基于线性扰动假设对管道预混火焰的动态响应进行了理论分析,推导得到了正弦扰动下火焰而脉动时域表达式.同时利用增强型电荷耦合器和动态压力传感器对管道预混火焰形状周期性变化过程进行相同步测量,研究了当量比和扰动频率对火焰面脉动的影响规律.理论分析和实验测量的结果一致,表明上述物理量的改变会直接影响火焰面脉动的褶皱数和褶皱振幅.