火焰传递函数是理解和控制振荡燃烧的理论基础.本文通过自发化学荧光法测量放热率,双传声器技术获得燃烧器出口的压力和速度脉动,研究了不同雷诺数、当量比和扰动频率下的预混火焰传递函数.结果显示,随着脉动幅值的增加,火焰传递函数将出现由线性到非线性的变化过程.当量比、雷诺数和扰动频率的改变,都会影响火焰传递函数的幅值和相位特性.实验结果显示,放热率脉动同流场及火焰面的周期性变化直接相关.结果为掌握振荡燃烧机理,发展相关的预测理论和抑制技术提供参考.“,”In this paper,the premixed flame transfer functions at different Reynold numbers, equivalence ratio and forced oscillation frequencies are measured and analyzed.The unsteady heat release rate is obtained by chemiluminescence measurement and the bulk velocity fluctuations at the outlet of the combustor are determined using two-microphone technique.Results show that the flame transfer functions demonstrate the dynamic processes from linear to non-linear region due to the increase of oscillation amplitude.The amplitude and phase of the flame transfer functions change according to the variations of the equivalence ratio,Reynold number and forced frequencies. Flame images recorded by ICCD indicate that variations of flame structures are closely related to the fluctuation of heat release rate.These results help to understand the mechanism of combustion dynamics,and develop the theory for prediction and control strategies.