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首页> 外文会议>Spring Technical Meeting of the Eastern States Section of the Combustion Institute >Experimental analysis on the effect of turbulence on the structure and dynamics of a bluff-body stabilized conical lean premixed flame
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Experimental analysis on the effect of turbulence on the structure and dynamics of a bluff-body stabilized conical lean premixed flame

机译：湍流湍流效果和动力学稳定锥形精益预混火焰效果的实验分析

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The structure of an unconfined, lean propane flame stabilized on an axisymmetric bluff body is studied for different levels of turbulence intensity in the approach flow. By using suitable arrangements, mean turbulence intensity, u'/U levels between 4 and 30% were obtained. Simultaneous planar laser induced fluorescence imaging of hydroxyl radical (OH) and formaldehyde (CH_2O) was performed to determine the effects of turbulence on local flame structure. The flame structure was observed to be strongly modified by the turbulent flow field. Formation of cusps and unburnt mixture fingers were observed as the turbulence intensity was stepwise increased from 4 to 14% but, the heat release region remained continuous. For turbulent conditions higher than 14%, localized extinction was observed along the flame surface creating isolated islands of product surrounded by preheated reactants. Pockets of reactants were observed inside the flame envelope with heat release occurring along its boundaries. The overall flame shape was observed to change from symmetric to asymmetric mode with increasing turbulence intensity. The curvature pdfs broadened with increasing levels of turbulence intensity. The flame brush thickness showed an initial increase with increasing turbulence levels but saturated beyond 24% turbulence intensity. Measurements showed reduction in flame surface density with increasing levels of turbulence intensity.
机译：在接近流动中，研究了在轴对称虚张体上稳定在轴对称虚张体上稳定的非整合的瘦丙烷火焰的结构。通过使用合适的布置，获得了4至30％之间的平均湍流强度，U'/ U水平。进行同时平面激光诱导羟基（OH）和甲醛（CH_2O）的荧光成像以确定湍流对局部火焰结构的影响。观察到火焰结构被湍流场强烈修改。由于湍流强度从4-14％增加，观察到尖瓣和未燃烧的混合物手指的形成，但是，热释放区域保持连续。对于高于14％的湍流条件，沿着火焰表面观察到局部消光，从预热反应物包围的孤立的产品岛。在火焰包膜内观察反应物口袋，其沿其边界发生热释放。观察到总体火焰形状以随着湍流强度的增加，从对称变为不对称模式。随着湍流强度水平的增加，曲率PDF扩大。火焰刷厚度随着湍流水平的增加而初始增加，但饱和超过24％的湍流强度。测量显示出火焰表面密度的降低，随着湍流强度的增加。

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