一、引言 本生灯火焰顶部开口现象实际上是火焰面大曲率变化处的火焰局部熄火。除了化学反应动力学性质引起的火焰局部熄火外,对局部熄火机理的理解主要有两种。一种认为是由流场不均匀造成的气动拉伸机理;另一种认为是燃料和氧化剂分层扩散的机理。最初对本生灯火焰顶部开口现象的解释是认为二种机理都在起作用。后来的研究指 First, the introduction Bunsen burner flame at the top of the opening phenomenon is actually a large change in the flame curvature of the flame at the local flameout. Except for the partial flameout due to the chemical reaction kinetics, there are mainly two kinds of understanding about the mechanism of partial flameout. One is thought to be a pneumatic stretching mechanism caused by an inhomogeneous flow field; the other is considered as a mechanism of stratified diffusion of fuel and oxidizer. The initial explanation for the opening of the Bunsen burner flame roof is that both mechanisms work. Later research means