Flame structure of nozzles offsetting opposite flows
Flame structure of nozzles offsetting opposite flows
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DOI：
10.1088/1742-6596/745/3/032030
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发表时间：
2016-10
期刊：
影响因子：
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通讯作者：
Y. Yahagi;Yuichiro Morinaga;Kyosuke Hamaishi;I. Makino
中科院分区：
文献类型：
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作者：
Y. Yahagi;Yuichiro Morinaga;Kyosuke Hamaishi;I. Makino
通过使用 2D 激光诊断抵消相反流动的喷嘴，实验研究了火焰区域后面的涡流对火焰结构的影响。甲烷空气预混合气体从上、下燃烧器等流量喷出。产生不平衡的逆流，使下燃烧器从中心轴滑动。在我们提出的流动系统中，由于上部流和下部流之间的速度差，涡流仅在已燃气体区域中通过剪切应力形成。三种不同的火焰结构：倾斜火焰、边缘形状火焰和双曲线火焰是由偏移率和燃料流组成决定的。形成的涡结构随偏移率的变化而变化。火焰后面形成的涡流对于火焰的稳定性起着重要作用。
Effects of vortexes behind flame zone on the flame structures are investigated experimentally by nozzles offsetting opposite flows with 2D laser diagnosis. Methane air premixed gas issued from upper and lower burners with equal flow rate. An imbalanced counter flow is produced to slide the lower burner from the center axis. In our proposed flow system, the vortexes are only formed in the burnt gas region by the shear stress due to the velocity difference between the upper flow and lower flow. Three distinct flames structures, slant flames, edge shape flames, and hyperbolic flames are decided with the offsetting rate and fuel flows composition. The formed vortexes structures changed with the offsetting rate. The vortex formed behind the flame plays an important role for the flame stability.