开缝钝体对微型燃烧器燃烧性能改善的研究

Numerical analysis on combustion characteristics in micro-combustor with a slotted bluff-body

为了提高微型燃烧器内的燃烧稳定性,将开缝钝体稳燃技术应用于微型燃烧器中,采用详细化学反应机理模拟了不同速度下微型开缝钝体燃烧器与微型常规钝体燃烧器的燃烧情况。结果表明:开缝钝体燃烧器火焰宽度一致性较好,火焰中心温度沿轴向分布更加均匀;开缝钝体燃烧器燃烧效率高于常规钝体燃烧器;当缝隙直径为0.1 mm时,微型开缝钝体燃烧器吹熄极限达到最高,高于微型常规钝体燃烧器。开缝钝体能有效改善微型燃烧器的燃烧状况。

To improve the stability of combustion in micro-combustor,a slotted bluff-body was used to stabilize the combustion in a micro-burner and the detailed chemical reaction mechanism was adopted to simulate the combustion condition in a micro-combustor with a slotted and unslotted bluff-body at different feed velocities. The simulation results showed that the slotted bluff-body combustor had more uniform and stable flame,and the center temperature of the flame was more uniform along the axial direction. The combustion efficiency of micro slotted bluff-body combustor was higher than that of the conventional bluff-body combustor. When the slot diameter was 0. 1mm,the blow-off limit reached to the highest,which was significantly higher than that of micro conventional bluff-body burner. The combustion conditions could be effectively improved by using the slotted bluff-body.