Investigation on combustion characteristics and thermal performance of a three rearward-step structure micro combustor fueled by premixed hydrogen/air
Investigation on combustion characteristics and thermal performance of a three rearward-step structure micro combustor fueled by premixed hydrogen/air
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DOI：
10.1016/j.renene.2022.01.019
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发表时间：
2022-01
期刊：
影响因子：
8.7
通讯作者：
Yan Tan;J. E.;Jingwei Chen;Gaoliang Liao;Feng Zhang;Jintao Li
中科院分区：
文献类型：
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作者：
Yan Tan;J. E.;Jingwei Chen;Gaoliang Liao;Feng Zhang;Jintao Li
为了实现微燃烧室壁面高且均匀的温度分布，建立了后台阶结构微燃烧室内氢/空气预混混合物的三维数学模型。研究了后台阶结构、进口速度对微燃烧室燃烧特性和热性能的影响。结果表明，后台阶结构提高了微燃烧室的燃烧强度，稳定了火焰。当进口速度为7.0 m/s时，随着后向1级至3级的增加，燃烧效率的最大差异约为2.28%，可燃性下限和上限的改善百分比分别为20%和3.5%。结果表明，后台阶结构提高了微燃烧室外壁平均温度，降低了外壁温度均匀性。当进口速度为5.0 m/s时，3阶燃烧室的平均外壁温度和温度差分别比1阶燃烧室高6.3 K和39.6 K。当进口速度为7.0 m/s，当量比为1.5 m/s时，三阶微燃烧室的最大协同度为2.99%。
In order to achieve high and uniform wall temperature distribution in the micro combustor, a three-dimensional mathematical model of the premixed hydrogen/air mixtures in the micro combustors with rearward-step structure is established in this work. The effects of rearward-step structure, inlet velocity on combustion characteristics and thermal performance in the micro combustor are investigated. The results indicate that the rearward-step structure enhances the combustion intensity and stabilizes the flame in micro combustor. When the inlet velocity is 7.0 m/s, with the increase in the rearward-steps from one to three, the maximum combustion efficiency difference is about 2.28% and the percentages of improvements in lower and upper flammability limits are 20% and 3.5%, respectively. The achieved results show that the rearward-step structure increases the mean outer wall temperature and deteriorates the outer wall temperature uniformity in the micro combustor. When the inlet velocity is 5.0 m/s, the mean outer wall temperature and the temperature difference of the combustor with 3-steps are 6.3 K and 39.6 K higher than that of the combustor with 1-step, respectively. The maximum synergy degree in the micro combustor with 3-steps is 2.99% when the inlet velocity and equivalence ratio are 7.0 m/s and 1.5, respectively.