预混火焰微小尺度燃烧传播机制研究

Research on Small-Scale Flame Propagation Combustion Mechanism

采用实验与数值模拟相结合的方法对预混气体火焰在平板狭缝中传播进行了研究,利用高速数字摄像系统对传播过程进行抓取。结果表明,当狭缝高度一定时,火焰的熄灭常数与临界火焰速度呈现的是近似直线关系。并对化学反应放热、壁面散热等与预混气体火焰传播与淬熄有关因子之间的内在联系进行分析,总结出预混气体火焰在平板狭缝中的传播与熄灭规律。对判断火焰在狭缝中是否淬熄提供参考,对选用阻火器及设计阻火芯提供一定的理论依据。

Using a combination of experimental and numerical simulation methods to study the premixed gas deflagration flame propagation in the flat slit. In this paper,the use of high-speed digital camera system for catching the propagation principle,and the result shows that the extinguish length and the critical flame propagation speed displays approximately linear when there is a certain slot height. By studying the intrinsic link of the propagation exothermic chemical reaction,Wall heat dissipation and so on with the flame propagation and extinguish states,looking the inherent propagation and extinguish laws of premixed flame propagation in a flat slit. Judging whether the flame quenching slit to provide a reference. To provide theoretical support for the selection and design of the flame arrester core.