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首页> 外文期刊>International Journal of Heat and Fluid Flow >Effect of different wall materials and thermal-barrier coatings on the flame- wall interaction of laminar premixed methane and propane flames
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Effect of different wall materials and thermal-barrier coatings on the flame- wall interaction of laminar premixed methane and propane flames

机译：不同壁材料和热障涂层对层流预混甲烷和丙烷火焰的火焰壁相互作用的影响

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摘要

We investigate the flame-wall interaction of laminar, premixed methane/air and propane/air flames in a stationary, sidewall-quenching configuration over a wide range of equivalence ratios. Both, the wall material (stainless-steel, cast iron, aluminum), the type of thermal-barrier coating (soot, zirconium dioxide, titanium dioxide) and its thickness (only for zirconium dioxide) were systematically varied. The flame-wall interaction is characterized by the measurement of quenching distances, which are based on the separate analysis of chemiluminescence images of electronically excited OH* and CH* radicals. A method has been developed to determine the position of the wall in the chemiluminescence images with sub-pixel accuracy. It turns out, that while the quenching distance strongly changes with stoichiometry and fuel, it only weakly depends on the wall material and type of coating, although the quenching distance tends to decreases with increasing thickness of the ceramic coating. Overall, the data confirms present scaling laws with a quenching Peclet number of Pe(Q) approximate to 7.5. Quenching distances determined independently for OH* and CH* differ more strongly than the distances of peak mole fractions in an undisturbed flame, without the influence of the wall.
机译：我们研究了层状，预混合的甲烷/空气和丙烷/空气火焰在固定的，侧壁淬火配置下的宽当量比范围内的火焰壁相互作用。墙体材料（不锈钢，铸铁，铝），热障涂层的类型（烟灰，二氧化锆，二氧化钛）及其厚度（仅适用于二氧化锆）都有所不同。火焰壁相互作用的特征在于猝灭距离的测量，该猝灭距离的测量基于对电子激发的OH *和CH *自由基的化学发光图像的单独分析。已经开发出一种方法以亚像素精度确定壁在化学发光图像中的位置。事实证明，虽然淬火距离随化学计量和燃料而变化很大，但淬火距离仅随壁材料和涂层类型而变弱，尽管淬火距离往往随着陶瓷涂层厚度的增加而减小。总体而言，数据证实了当前的氧化皮定律，其中Pe（Q）的淬灭Peclet数接近7.5。独立确定的OH *和CH *的猝灭距离比不受扰动的火焰中峰值摩尔分数的距离差异更大，而不受壁的影响。

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