同軸噴流拡散火炎の安定と浮上がり機構に関する研究(熱工学,内燃機関,動力など)

概要

論文の詳細を見る
The stabilizing and lifting mechanisms of a jet diffusion flame developing in a coaxial-flow burner were investigated experimentally, using propane as fuel. Measurements of stability limits, and visualization of flame and fuel jets have been performed using the Mie scattering technique, instantaneous schlieren, and particle tracer methods. As a result, it is found that the flame stability limits increases as the rim thickness (δ=0.2〜4mm) is increased, and the increase leads to changes of the velocity and size in the recirculation. Four types of flame stabilizing mechanism were clarified i.e., Type 1 lifted off of the attached flame due to local extinction, Type 2 blew-off of the attached flame due to flame stretch, Type 3 blew-off due to thermal quenching, and Type 4 blew-off due to changes of the flow in the recirculation for a greater rim thickness. For Type 1, it is very familiar with the local extinction of the flame zone near the transition point. Furthermore, for Type 2 and 3, it was found that the displacement rate based on the concept of flame stretch theory agrees with the critical stretch rate at which the laminar counterflow diffusion name extinguishes. It was suggested that the stabilizing mechanism of jet diffusion flame is similar to the extinction problem of the laminar counterflow diffusion flame.
一般社団法人日本機械学会の論文
2004-08-25