非预混燃烧中喷嘴结构布局影响火焰长度的变化

Influence of Nozzle Structure Layout on the Change of Flame Length in a Non-premixed Combustion Process

验证了用数值方法研究湍流燃烧的可靠性,在燃气流量和喷口总面积不变的情况下,调整喷口的数量和间距,确定了多种燃烧器喷口布局方案;讨论了非预混燃烧中喷口数量和间距对火焰长度的影响,认为喷口数量和间距的改变不但会引起空气和燃气的混合程度发生变化,也使得各股燃气之间的扰动程度不一样。所以应合理调整喷口布局,改变燃烧器的火焰结构和温度分布,使燃烧的高温区域更加集中,提高燃气炉的热效率。

Verified was the reliability of numerical methods on the study of turbulent combustion.Under the condition of the gas flow rate and the total area of spouts being kept unchanged,by adjusting the number and spacing of spouts,several burner spout layout versions were determined.The influence of the number and spacing of spouts on the flame length in a non-premixed combustion process was discussed.It is believed that the change in the number and spacing of the spouts will cause not only a change of the air and gas mixing degree but also make the disturbance degrees between various gas streams different.Hence,the spout layout should be properly adjusted to change the burner flame configuration and temperature distribution and make the high-temperature combustion zone more centralized,thus enhancing the thermal efficiency of a gas-fired boiler.