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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study of bluff body stabilized laminar reactive boundary layers
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Experimental study of bluff body stabilized laminar reactive boundary layers

机译：钝体稳定层流反应边界层的实验研究

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Experiments have been carried out to analyze the characteristics of laminar cross-flow methane-air diffusion flames in the presence of bluff bodies. The stable operating regime having steady and oscillating flames, and unstable operating regime that includes flame blow-out and extinction, are identified by varying the air and fuel flow rates systematically. Detailed stability maps indicating these regimes have been proposed for bluff bodies having rectangular, isosceles triangular and semicircular shapes. Three types of flames, namely plate stabilized, bluff body stabilized and separated flames, have been captured using a high-definition digital camera. The flame anchoring locations, flame shapes and transitions between different regimes of stabilization have been analyzed thoroughly. Hysteresis effects in the transition between the regimes, when the air flow rate is systematically increased or decreased, are also presented in the stability maps. The interesting features of the semicircular cylinder bluff body have been discussed in comparison to other two bluff bodies. Additionally, the effect of addition of hydrogen in small quantities to methane has also been envisaged. When 10% hydrogen by volume is added to methane, the plate stabilized regime is seen to be widened. Also, the hysteresis effect is seen to reduce with the injection of hydrogen.
机译：已经进行了实验以分析在有钝体的情况下层流错流甲烷-空气扩散火焰的特性。通过系统地改变空气和燃料的流速，可以确定具有稳定火焰和振荡火焰的稳定运行状态，以及包括火焰喷出和熄灭的不稳定运行状态。已经针对具有矩形，等腰三角形和半圆形形状的钝体提出了指示这些状态的详细的稳定性图。使用高清数码相机已捕获了三种火焰，即平板稳定火焰，钝体稳定火焰和分离火焰。彻底分析了火焰的锚固位置，火焰形状以及不同稳定状态之间的过渡。当空气流量系统地增加或减少时，在状态之间的过渡中的磁滞效应也显示在稳定性图中。与其他两个阻流体相比，已经讨论了半圆形阻流体的有趣特征。另外，还设想了向甲烷中少量添加氢的效果。当将按体积计10％的氢气添加到甲烷中时，可以看到塔板稳定状态变宽了。同样，可以看到随着氢的注入，磁滞效应会降低。

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