Fundamental Researsh on Structure around a Flame Base and Stability Mechanism of Catalitycally Stabilized Diffusion Flame

火焰基部结构及催化稳定扩散火焰稳定机理的基础研究

• 批准号: 05452160
• 负责人: MIZOMOTO Masahiko
• 金额: $ 2.94万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452160/
• 关键词: Diffusion Flame; Boundary Layr Combustion; Catalyst; Flame Stucture; Stability Mechanism; Experiment; Numerical Analysis; 安定性; 壁面温度分布; 火炎基部

A flame structure around the flame base and a stability mechanism of diffusion flame in a laminar boundary layr ober a catalytic or non-catalytic flat porous plate with fuel (methane-nitrogen mixture) injection have been inverstigated experimentallyn and numerically. When the fuel concentration is decreaed, the flame becomes unstable wiht flame base oscillation. As the cataytic porous plate is used, the fuel concentration at the flame stabilization limit becomes lower compared to non-catalytic case. The experimental results also revealed that the flame can be stabilizud with lower fuel concentration condition for higher porous plate temperature, because the heat loss to the porous plate is reduced. These results suggest that the catalytic reaction near the flame base is supposed to keep the porous plate temperature high, and then, the flame can be stabilizud with lower fuel concentration condition, reducing the heat loss. The numerical results of flame location and the temperature profile show good agreement with experimental ones. The oscillating phenomenon, however, can not be predicted.

本文通过实验和数值模拟研究了燃料（甲烷-氮气混合物）喷射时，多孔平板表面层流边界层中火焰底部周围的火焰结构和扩散火焰的稳定机理。当燃料浓度降低时，火焰变得不稳定，出现火焰底部振荡。当使用催化多孔板时，与非催化情况相比，火焰稳定极限处的燃料浓度变得更低。实验结果还表明，在较低的燃料浓度条件下，多孔板温度较高时，由于多孔板的热损失减少，火焰可以稳定。这些结果表明，火焰底部附近的催化反应可以使多孔板保持较高的温度，从而在较低的燃料浓度条件下稳定火焰，减少热损失。火焰位置和温度分布的数值计算结果与实验结果吻合较好。然而，振荡现象无法预测。