Experimental Studies of Flame Spread

本文对甲烷-空气分层系统中前缘部分预混火焰和后缘扩散火焰的结构进行了实验研究。 三重火焰的存在条件在超速火焰的前缘进行了研究，这些已被认为是锚定机制，为解除火焰，以及负责扩散火焰的边缘扩散到气体混合层。 本研究的目的是照亮的详细结构的前缘在一个简单的分层系统，使用各种诊断技术，包括CH和OH荧光和瑞利散射，并调查的前缘结构的响应，如燃料流和空气流的速度，燃料成分和流动方向等参数的变化。

This is an experimental study of the structure of a leading-edge partially premixed flame and a trailing diffusion flame in a layered methane-air system. Conditions for the existence of triple flames at the leading edge of speeding flames are investigated; these have been considered as the anchoring mechanism for lifted flames as well as being responsible for the spread of the edges of diffusion flames into gaseous mixing layers. This study aims to illuminate the detailed structure of the leading edge in a simple layered system using a variety of diagnostic techniques including CH and OH fluorescence and Rayleigh scattering, and to investigate the response of the leading-edge structure to changes in such parameters as fuel-stream and air-stream velocities, fuel composition, and flow orientation.