【摘要】 本文试图从非稳定射流火焰的燃烧噪声角度来研究火焰中的微团特性。定义火焰特征反应时间来反映火焰的化学反应动力学和火焰流场流动动力学特性。通过自相关系数测量火焰涡团的特征反应时间，结果表明：相同的燃气流量下，特征反应时间与射流速度成反比；特征反应时间随射流速度的变化斜率与燃气流量相关。更多还原

【Abstract】 The characteristics of the vortex inside the jet flame are studied through the analysis of the flame noise of the unstable state. The reactivity time scale of the vortex is defined to describe the chemical reactivity dynamics and the flow dynamics of the flame. The time scale is obtained through the self correlation coefficient of the sound wave. It is clear that the time scale is inverse ratio to the jet velocity under the same gas velocity. The slope of the time scale is related to the gas velocity.更多还原