Combustion of gaseous and liquid fuels in meso-scale tubes with wire mesh
Combustion of gaseous and liquid fuels in meso-scale tubes with wire mesh
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DOI：
10.1016/j.proci.2012.05.064
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
M. Mikami;Yoshiyuki Maeda;K. Matsui;Takehiko Seo;L. Yuliati
中科院分区：
文献类型：
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作者：
M. Mikami;Yoshiyuki Maeda;K. Matsui;Takehiko Seo;L. Yuliati
对金属丝网细观管内气体和液体燃料的燃烧进行了实验研究。对于C_3H_8/空气混合物，即使对于比经典淬熄直径小的管，也可以在没有外部加热的情况下通过壁和网格中的热传导从已燃烧气体到未燃烧气体的热再循环来稳定火焰。该网增强了从加热壁到未燃烧气体的热传递。对于大于经典淬熄直径的管，即使在回火极限之外，火焰也可以通过热再循环在管内稳定。在特定的流速范围内，火焰以相对高的速度传播并且在网格附近发生熄灭，但是如果条件从具有稳定火焰的另一条件逐渐转变，则火焰可以在网格附近稳定。因此，网可以用作燃烧抑制剂或增强剂。基于其他研究者预测的两种稳态火焰：正常火焰和弱火焰，讨论了两种类型的燃烧行为。其次，在直径为3.5mm的单网孔和双网孔中尺度管道内，对乙醇/正庚烷混合物的电喷雾燃烧进行了研究。火焰可以在没有外部加热的情况下稳定在网格附近。如果液滴穿过网格直接与火焰相互作用，则会发生热损失和不对称的火焰形状。双网格燃烧室的火焰稳定区比单网格燃烧室的火焰稳定区大，除壁面润湿区外，与气体燃料燃烧室的火焰稳定区相当。
Combustion of gaseous and liquid fuel in meso-scale tubes with wire mesh was studied experimentally. For C3H8/air mixtures, the flame can be stabilized near the mesh inside the tube without external heating even for smaller tube than the classical quenching diameter by heat recirculation from the burned gas to the unburned gas through heat conduction in the wall and mesh. The mesh enhances heat transfer from the heated wall to the unburned gas. For tubes larger than the classical quenching diameter, the flame can be stabilized inside the tube even outside the flashback limit by the heat recirculation. Within a specific range of flow velocity, the flame propagates at relatively high speed and extinction occurs near the mesh, but the flame can be stabilized near the mesh if the condition is gradually shifted from another condition with a stabilized flame. Therefore, the mesh can act as a combustion inhibitor or an enhancer. The two types of burning behavior are discussed based on two steady-state flames; normal flame and weak flame predicted by other researchers. Next, combustion of electro-sprayed ethanol/n-heptane mixtures inside a meso-scale tube with d=3.5mm with a single mesh and double meshes was studied. The flame can be stabilized near the mesh without external heating. If droplets passing through the mesh directly interact with the flame, heat loss and asymmetric flame shape occurs. The flame stabilization region with double meshes is larger than that with a single mesh and comparable to that for gaseous fuel combustor except for the wall wetting region.