This work presents experimental measurements of various 80 kW_th propane flames, using a swirl burner, and modeling of the radiative heat transfer. The combustion conditions were altered by varying the oxygen concentration in the oxidant within range of 21–32%, while keeping the thermal input and oxygen-to-fuel ratio constant. Temperature, gas composition, and radiative intensity were measured using probes, while the soot volume fraction was quantified using nonintrusive laser-induced incandescence. The radiative intensity and the soot volume fraction increased with an increased oxygen concentration in the flame. When the oxygen concentration exceeded 27% the soot volume fraction was increased more than 14-fold. The results reveal the potential of promoting radiative heat transfer by increasing the oxygen concentration; the total radiative intensity becomes dominated by the soot particle contribution. In addition, laser-induced incandescence was successfully used for instantaneous and spatially resolved soot measurements in this type of furnace being at a technical scale.

中文翻译：

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辐射传热模型和烟尘的原位诊断在80千瓦_个丙烷火焰与变原料气氧浓度

这项工作提出了各种80 kW _th的实验测量丙烷火焰，使用旋流燃烧器，以及辐射传热模型。通过在21–32％的范围内改变氧化剂中的氧气浓度来改变燃烧条件，同时保持热输入和氧气/燃料比恒定。使用探针测量温度，气体成分和辐射强度，同时使用非侵入式激光诱导的白炽度对烟灰体积分数进行定量。辐射强度和烟灰体积分数随火焰中氧气浓度的增加而增加。当氧气浓度超过27％时，烟灰体积分数增加了14倍以上。结果表明，通过增加氧气浓度可以促进辐射传热。总辐射强度由烟尘颗粒贡献决定。