利用纹影法，在定容燃烧弹中研究了较高当量比和不同初始压力下氢气空气预混合气的燃烧特性，分析了两参数对其燃烧特性的影响。试验结果表明，本实验条件下的氢气空气预混合物燃烧过程中，主火焰两侧出现挤流火焰，且挤流火焰的传播明显快于主火焰；根据出现挤流火焰与否、两侧挤流火焰相遇与否、实验时的热力参数、燃料浓度等条件，燃烧过程可分为四个阶段；在本文的实验条件下随着当量比增加，挤流火焰燃烧速度加快，其倾向于自燃时的多点燃烧；随着初始压力降低，挤流火焰逐渐出现在主火焰层流燃烧阶段。
By means of schlieren method, the combustion characteristics of hydrogen-air pre-mixture with higher equivalence ratio and different initial pressures have been studied in constant volume combustion bomb （CVCB）. The experimental results show that under the experimental conditions in the work, there appears squish flame on both sides of the main flame, and it propagates faster than the main flame obviously. According to squish flame whether to appear, encounter between them whether to take place, and the thermal parameters and concentration in the experiments, the combustion process can be divided into four stages. On the conditions of this paper with equivalence ratio increasing, squish flame combusts rapider and it inclines to spontaneous combustion. As the initial pressure drops, squish flame gradually appears in the stage of laminar burning of the main flame.
参考文献
| [1] | C.M. White;R.R. Steeper;A.E. Lutz .The hydrogen-fueled internal combustion engine: a technical review[J].International journal of hydrogen energy,2006(10):1292-1305. |
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