Design of "model-friendly" turbulent non-premixed jet burners for C2+ hydrocarbon fuels.
Design of "model-friendly" turbulent non-premixed jet burners for C2+ hydrocarbon fuels.
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用于 C2 碳氢化合物燃料的“模型友好”湍流非预混喷射燃烧器的设计。
DOI：
10.1063/1.3605491
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
R. Schefer
中科院分区：
文献类型：
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作者：
Jiayao Zhang;C. Shaddix;R. Schefer
在实验室规模的湍流燃烧器中进行的实验测量，具有良好控制的边界和流动配置，可以提供有价值的数据，用于验证适用于实际燃烧器的设计和分析的燃烧-化学相互作用的模型。本文报道了两种典型的非预混湍流射流燃烧器的设计，分别用于未稀释的气态和液态烃燃料。先前的这种类型的燃烧器仅被开发用于由H（2）、CO和/或甲烷组成的燃料，通常具有显著的稀释。虽然这两种新的燃烧器都是由带有环形引燃火焰的同心管组成的，但液体燃料燃烧器具有额外的燃料蒸发步骤和电加热燃料蒸汽输送系统。这些燃烧器的性能是通过询问四个乙烯火焰和一个火焰燃料的一个简单的JP-8替代证明。通过目视观察，发现可见火焰长度与标准经验关联式吻合较好。瑞利线成像表明，先导火焰提供了一个空间均匀的流动的热产品沿着边缘的燃料射流。OH激光诱导荧光的平面成像揭示了燃料射流雷诺数（Re）小于20，000的高应变近燃烧器区域中缺乏局部火焰熄灭，以及更高射流速度的越来越常见的熄灭事件。煤烟激光诱导白炽的平面成像显示，在这些火焰中的煤烟层是相对较薄的，并夹带到涡流结构中的富燃料区域内的火焰片。
Experimental measurements in laboratory-scale turbulent burners with well-controlled boundary and flow configurations can provide valuable data for validating models of turbulence-chemistry interactions applicable to the design and analysis of practical combustors. This paper reports on the design of two canonical nonpremixed turbulent jet burners for use with undiluted gaseous and liquid hydrocarbon fuels, respectively. Previous burners of this type have only been developed for fuels composed of H(2), CO, and/or methane, often with substantial dilution. While both new burners are composed of concentric tubes with annular pilot flames, the liquid-fuel burner has an additional fuel vaporization step and an electrically heated fuel vapor delivery system. The performance of these burners is demonstrated by interrogating four ethylene flames and one flame fueled by a simple JP-8 surrogate. Through visual observation, it is found that the visible flame lengths show good agreement with standard empirical correlations. Rayleigh line imaging demonstrates that the pilot flame provides a spatially homogeneous flow of hot products along the edge of the fuel jet. Planar imaging of OH laser-induced fluorescence reveals a lack of local flame extinction in the high-strain near-burner region for fuel jet Reynolds numbers (Re) less than 20,000, and increasingly common extinction events for higher jet velocities. Planar imaging of soot laser-induced incandescence shows that the soot layers in these flames are relatively thin and are entrained into vortical flow structures in fuel-rich regions inside of the flame sheet.