Experiment on dynamic response characteristics of tubular flame excited by acoustic field
The dynamic response of methane/air premixed swirling tubular flame under the excitation of acoustic field signal was investigated,and the dynamic response range of flame to the frequency of acoustic field excitation signal was obtained under different air flow rates of gas mixture,which revealed the stable combustion range of tubular flame and the periodic changes of flame structure,pressure fluctuation and heat release rate under the excitation of acoustic field.The results show that the dynamic response of the flame to the acoustic field excitation signal is low-pass filtered,and the turning frequency is about 195 Hz.The flame response weakens when the excitation frequency of the acoustic field signal is greater than 195 Hz,and the larger the excitation frequency is,the smaller the influence on the flame.In addition,the larger the air flow rate is at the same excitation frequency,the smaller the influence on the flame.The flame response is diversified when the acoustic field excitation signal is less than 195 Hz.When the air flow rate is greater than 100 L/min,the flame directly extinguishes because of the acoustic field.When air body flow is less than 100 L/min,there is a flame axial oscillation combustion of the acoustic field signal excitation frequency interval,and in this interval the flame exhibits forced oscillation combustion with the excitation frequency.
tubular flameflame structureacoustic field excitationphase space reconstructionRP transformation
NETL
NSTL
万方数据
维普
