Turbulent Spray Flames of Acetone and Ethanol Approaching Extinction
Turbulent Spray Flames of Acetone and Ethanol Approaching Extinction
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DOI：
10.1080/00102200903467754
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发表时间：
2010-06
影响因子：
1.9
通讯作者：
A. Masri;J. Gounder
中科院分区：
文献类型：
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作者：
A. Masri;J. Gounder
本文介绍了平均温度，轴向速度，湍流度，和液滴场的稀释喷雾，丙酮或乙醇作为液体燃料的飞行员稳定射流火焰的测量。激光诱导荧光（LIF）被用来成像羟基自由基OH，这标志着热区域或反应区的存在。取决于所使用的燃料，通过来自丙酮或米氏散射的成像LIF来描绘流内的液滴。随着射流速度的增加，火焰逐渐接近吹离区域进一步下游稳定的试点。据发现，乙醇和丙酮火焰的平均速度，湍流，和液滴场是有点相似，这些都没有改变很大的射流速度增加，特别是当归一化与相关参数。然而，温度和反应场是变化的，并经历偏离指示的非预混到预混火焰行为取决于燃料的蒸气压和接近吹离。在乙醇火焰中观察到OH分布的广泛区域以及标记可能的局部消光的OH分布的断裂。
This paper presents measurements of mean temperature, axial velocity, turbulence, and droplets fields in pilot-stabilized jet flames of dilute sprays where acetone or ethanol is used as liquid fuel. Laser-induced fluorescence (LIF) is employed to image hydroxyl radical OH which marks the existence of hot regions or reaction zones. Depending on the fuel used, droplets within the flow are delineated by imaging LIF from acetone or Mie scattering. As the jet velocity is increased, the flames gradually approach blow-off in a region further downstream from the stabilizing pilot. It is found that the mean velocity, turbulence, and droplet fields are somewhat similar for both ethanol and acetone flames, and these do not change much with increasing jet velocity, particularly when normalized with the relevant parameters. However, the temperature and reactive fields are varying and undergo departure indicative of nonpremixed to premixed flame behavior depending on the vapor pressure of the fuel and proximity to blow-off. Broad regions of OH as well as breaks in the OH profile marking possible local extinction are observed in the ethanol flames.