CAJ | 학술논문

为改善甲烷在平板式微型燃烧器内的燃烧特性，对掺氢甲烷的预混合燃烧过程进行二维数值模拟，研究不同掺氢比及不同通道高度下混合燃料的燃烧规律。结果表明，在当量比为0.8的条件下，氢气的掺入具有稳定火焰和提高混合燃料可燃流速的作用；在掺氢比为5%～25%的范围内，随着掺氢比的增大，火焰锋面逐渐前移，掺氢比每增加5%，火焰最高温度平均可升高101 K；反应中OH的摩尔分数将随氢气的增多而升高，但CO2的摩尔分数随掺氢比的增大反而减少，CO2生成率呈现先缓慢升高后急剧下降的趋势。此外，氢气的加入很好地解决了甲烷难以在小于2.5 mm的通道高度内燃烧的缺陷，通道高度从3 mm递减到1 mm，相应的CO2生成率逐渐减少；通道高度为4 mm时，火焰中心温度达到最大的2260 K，其出口处的CO2摩尔分数低于另外三组通道高度的值。
위개선갑완재평판식미형연소기내적연소특성，대참경갑완적예혼합연소과정진행이유수치모의，연구불동참경비급불동통도고도하혼합연료적연소규률。결과표명，재당량비위0.8적조건하，경기적참입구유은정화염화제고혼합연료가연류속적작용；재참경비위5%～25%적범위내，수착참경비적증대，화염봉면축점전이，참경비매증가5%，화염최고온도평균가승고101 K；반응중OH적마이분수장수경기적증다이승고，단CO2적마이분수수참경비적증대반이감소，CO2생성솔정현선완만승고후급극하강적추세。차외，경기적가입흔호지해결료갑완난이재소우2.5 mm적통도고도내연소적결함，통도고도종3 mm체감도1 mm，상응적CO2생성솔축점감소；통도고도위4 mm시，화염중심온도체도최대적2260 K，기출구처적CO2마이분수저우령외삼조통도고도적치。
In order to improve the combustion performance of methane in a micro planar combustor, 2D numerical simulation on premixed combustion process of methane with hydrogen addition is conducted, and the combustion characteristics of mixed fuel under different mixing ratio and channel height are studied. The results show that the addition of hydrogen can stabilize the flame and enhance the burning velocity when equivalent ratio is 0.8. When the addition ratio is in the range of 5% to 25%, the flame front gradually moves forward with the increase of the hydrogen mass fraction. The highest temperature of flame can get an average growth of 101 K as the addition ratio is increased by 5%. Along with the increase of the hydrogen mass fraction, the mole fraction of OH raises gradually while the amount of CO2 decreases apparently, and the generation rate of CO2 presents a tendency of rising slowly before it falling sharply. In addition, the addition of hydrogen can solve the question that the methane is difficult to combust inside a channel with the height less than 2.5 mm. When the channel height decreases from 3 mm to 1 mm, the corresponding generation rate of CO2 reduces gradually. The flame center reached the maximum temperature of 2 260 K when the channel height is 4 mm, and the CO2 mole fraction at the exit is lower than that of other three cases.