摘要
为了探究当量比对锥形燃烧器头部火焰稳定位置及排放特性的影响,采用数值模拟方法对锥形燃烧器的流动与燃烧特性进行研究。分析讨论了当量比从0.54增加至0.78时燃烧器头部的火焰锋面位置与高温区温度的变化规律,以及不同当量比下火焰指数、NO_(x)与CO排放量的变化趋势。研究结果表明,速度分布与回流区特征随当量比升高未见明显变化。随着当量比升高,高温区的最高温度逐渐升高,火焰稳定位置向燃烧器内部移动。当量比增加至0.66时开始发生回火,继续增加当量比时高温区贴近锥形燃烧器头部壁面与喷嘴,有烧毁燃烧器的危险。NO_(x)排放量随当量比增大而增大,当量比从0.54增加至0.66时,NO_(x)排放量缓慢增加,当量比继续增加至0.78过程中,NO_(x)排放量迅速增加,NO_(x)排放增加了32.4倍。CO排放量随当量比的增大先减小后增大,并在当量比为0.66时达到最小值。
In order to explore the effects of the equivalence ratio on the flame stable position and emission characteristics of the conical burner,a numerical simulation method was used to study the flow and combustion characteristics.The variation of flame front position and temperature in the high-temperature region of burner head when equivalence ratio increased from 0.54 to 0.78.The variation trend of flame index,NO_(x) and CO emission under different equivalence ratios were analyzed and discussed.The results show that the characteristics of velocity distribution and recirculation zone have no obvious change with the increase of the equivalence ratio.With the increase of equivalence ratio,the maximum temperature of the high-temperature zone increases gradually,and the stable position of flame moves to the inside of the burner.When the equivalence ratio increases to 0.66,the flashback begins.When the equivalence ratio continues to increase,the high-temperature zone is close to the wall of the conical burner and the nozzle,and there is a risk of burning the burner.NO_(x) emission increases with the increase of the equivalence ratio.When the equivalence ratio increases from 0.54 to 0.66,NO_(x) emission increases slowly.When the equivalence ratio continues to increase to 0.78,NO_(x) emission increases rapidly,and NO_(x) emission increases 32.4 times.The CO emission first decreases and then increases with the increase of equivalence ratio,and reaches the minimum when the equivalence ratio is 0.66.
作者
宋少雷
赵铁铮
刘潇
杨家龙
Song Shaolei;Zhao Tiezheng;Liu Xiao;Yang Jialong(The Third Military Representative Office of the Naval Equipment Department, Harbin 150078, China;College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China)
出处
《燃气轮机技术》
2022年第1期22-29,共8页
Gas Turbine Technology
