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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。
The flame transfer function is the theoretical basis for understanding and controlling oscillating combustion. In this paper, the spontaneous chemiluminescence method was used to measure the exothermic rate and the dual microphones were used to obtain the pressure and velocity pulsation at the outlet of the combustor. The premixed flame transfer functions at different Reynolds number, equivalence ratio and perturbation frequency were studied. The results show that with the increase of pulsation amplitude, the flame transfer function will change from linear to non-linear. Equivalent ratio, Reynolds number and disturbance frequency changes, will affect the flame transfer function amplitude and phase characteristics. The experimental results show that the exothermic rate pulsation is directly related to the periodic change of the flame surface. The results provide a reference for mastering oscillating combustion mechanism, development related prediction theory and suppression technology.