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提升反应温度对微尺度火焰稳定性的改善

ISSN号：1006-8740
期刊名称：《燃烧科学与技术》
时间：0
分类：TK223.2[动力工程及工程热物理—动力机械及工程]
作者机构：[1]浙江大学能源洁净利用国家重点实验室,杭州310027
相关基金：国家自然科学基金资助项目（50606030）;高等学校博士学科点专项科研基金资助项目（20060335124）;高等学校学科创新引智计划资助项（B08026）;国家杰出青年基金资助项目（50525620）.

作者：周俊虎[1], 汪洋[1], 杨卫娟[1], 刘建忠[1], 王智化[1], 岑可法[1]

关键词：微尺度燃烧, 加热, 数值模拟, 稳燃, micro combustion, heating, numerical simulation, stabilizing combustion

中文摘要：

本实验对微尺度燃烧器内部使用电热丝向反应物加热,提高其温度,减少散热影响,从而实现微尺度火焰稳燃.燃烧器为石英直圆管,长82 mm,通流面积3.33 mm2.氢气/穴气混合气体流量为0.12 L/min、0.2 L/min、0.4 L/min,电热功率分别为0W、1.05W、4.70W.实验结果显示,提高电热功率抑制熄火;提升燃料混合气体总流量也有助于抑制熄火;但高流量同时带来吹脱问题.测量燃烧器壁面温度,结合数值模拟研究内部燃烧过程.结果显示,随电热功率上升,反应温度和OH质量分数上升,证明电加热强化反应,抑制了热熄火.比较壁面散热,电热功率0W,流量由0.12 L/min上升到0.2L/min时,壁面散热占总能量份额由84.8%降低至81.1%.因此,在一定范围内提升燃料流量亦可抑制热熄火.

英文摘要：

Micro combustor suffers considerable surface heat loss,causing a decrease in reaction temperature.Low reaction temperature affects flame stability and causes thermal extinction.In this experiment,the combustor is heated from inside by an electrical-heating wire,and the increased reaction temperature leads to less negative effects of heat loss,thus improving the performance of the combustor.The combustor is a straight quartz tube,with a length of 82 mm and a flow area of 3.33 mm2.The H2/air mixture flow rates are 0.12 L/min,0.2 L/min,0.4 L/min,and the heat-ing power is adjusted to 0 W,1.05 W,4.70 W.The experimental result shows that heating helps inhibit extinction.Increasing fuel-mixture flow rate is also in favor of flame stabilization.However,high flow rate induces blow-out.Combined with the measured surface temperatures,the combustion process is investigated through numerical simula-tion.The results show that high heating power increases reaction temperature and OH concentration,thus proving that heating intensifies reaction and inhibits extinction.Surface heat losses under different conditions are compared.With the heating power of 0 W,the flow rates increase from 0.12 L/min to 0.2 L/min,and the ratio of surface heat loss to injected total energy decreases from 84.8% to 81.1%.Therefore,increasing flow rates within a certain scope inhibits extinction.

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