A Study on Transition of Shrinking Flame Disk to Flame Hole at Low Strain Rate Counterflow Diffusion Flames

저신장율 대향류확산화염에서 소화하는 화염디스크로부터 화염구멍으로 천이에 관한 연구

Experiments have been conducted to clarify impacts of curtain flow and velocity ratio on low strain rate flame extinction, and to further display transition of shrinking flame disk to flame-hole. Critical mole fractions at flame extinction are examined in terms of velocity ratio, global strain rate, and nitrogen curtain flow rate. It is shown that multi-dimensional effects at low strain rate flames through global strain rate, velocity ratio, and curtain flowrate dominantly contribute to flame extinction and transition of shrinking flame disk to flame hole. Our concerns are particularly focused on the dynamic behavior of an edge flame in shrinking flame disk.