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利用碳氢燃烧实验台,研究了二氧化碳和富氧空气对甲烷、乙烯层流燃烧火焰的特性影响,分析了不同气氛下火焰结构特性和温度分布规律.结果表明,随氧浓度从21%增加到50%(φ),甲烷、乙烯火焰高度下降70%,火焰温度和亮度同时增加,且发光区域呈向下收缩趋势;相同氧浓度下,乙烯火焰亮度高于甲烷.随CO_2浓度由0增加到20%(φ),火焰高度增加28%,各高度处火焰边缘温度平均下降290℃,中心温度平均下降132℃.火焰亮度降低,由黄色变为暗黄色,底部亮度更低,CO_2浓度超过20%(φ)后,火焰出现悬浮状态,最终被吹熄.
The effects of carbon dioxide and oxygen-enriched air on the characteristics of laminar flame of methane and ethylene laminar flow were studied by using a hydrocarbon combustion bench, and the flame structure and temperature distribution under different atmospheres were analyzed.The results showed that with the increase of oxygen concentration from 21% to 50% (φ), the flame height of methane and ethylene decreased by 70%, the flame temperature and brightness increased at the same time, and the luminescence region showed a downward shrinkage trend; under the same oxygen concentration, the ethylene flame brightness was higher than that of methane. 20% (φ), the flame height increased by 28%, the average flame edge temperature dropped 290 ℃ at each height, the average temperature dropped 132 ℃ .The flame brightness decreased from yellow to dark yellow, the bottom of the lower brightness, CO2 concentration over 20 % (φ), the flame appears suspended state, eventually blown out.