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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 using the shadowing method, the combustion characteristics of hydrogen-air premixed gas at higher equivalence ratio and different initial pressure were studied in a constant volume combustion bomb, and the influence of two parameters on the combustion characteristics was analyzed. The experimental results show that during the combustion process of the hydrogen-air premix under the experimental conditions, the squish flow flames appear on both sides of the main flame and the propagation of the squish flame is obviously faster than that of the main flame. According to the occurrence of squish flow flame or not, Flame encounter or not, the thermal parameters of the experiment, the fuel concentration and other conditions, the combustion process can be divided into four stages; under the experimental conditions in this paper with the equivalence ratio increases, squash flame combustion speed, which tends to spontaneous combustion Multi-point combustion; As the initial pressure decreases, the squish flow flames gradually appear in the main flame laminar flow combustion stage.