Experimental Study on N-heptane Droplet Combustion in a Micro-tube☆
Experimental Study on N-heptane Droplet Combustion in a Micro-tube☆
复制标题
DOI：
10.1016/j.egypro.2014.12.038
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
R. Yao;Zuozhen Qiu;Junwei Li;Jinhuai Huang;Xinjian Chen;Ning-fei Wang
中科院分区：
文献类型：
--
作者：
R. Yao;Zuozhen Qiu;Junwei Li;Jinhuai Huang;Xinjian Chen;Ning-fei Wang
对内径为 4 mm 的石英管中庚烷液滴的形成和火焰稳定性进行了实验研究。在没有外部加热的情况下，讨论了液滴滴落行为和火焰稳定性。结果表明，在无外部加热的条件下，毛细管尖端容易形成液滴，当庚烷流量（Qf）低于40ul/min时，火焰主要受液滴下落的影响，Qf=20ul/min时火焰稳定，Qf=30ul/min时火焰滴落熄灭。当Qf大于40ul/min时，由于管壁形成燃料膜，火焰不易受到影响。然后，研究了外部加热条件下庚烷液滴的火焰稳定性。结果发现，当Qf小于60ul/min时，由于壁温较高，不会形成液滴；当Qf大于60ul/min时，不会形成液膜，富燃料条件下火焰比贫燃料条件下更稳定。热循环可以有效地预热内管，并可以增加庚烷的蒸发量，但由于液滴下落和蒸发过快，可能会出现火焰振荡。
Formation and flame stability of heptane droplets in a quartz tube with inner diameter of 4 mm were experimentally studied. In the case of no external heating, droplet dropping behavior and flame stability are discussed. The results show that droplet is easily formed at tip of the capillary tube under no external heating condition, and flame is mainly influenced by droplet falling when heptane flow rate (Qf) is lower than 40ul/min, flame is stable with Qf = 20ul/min and extinguish with dripping when Qf = 30ul/min. when Qf is larger than 40ul/min, the flame is not easily affected due to formation of fuel film on the tube wall. Then, flame stability of heptane droplet was studied under external heating condition. It was found that when Qf is smaller than 60ul/min, no droplet is formed due to the higher wall temperature when Qf is larger than 60ul/min, no liquid film is formed, The flame becomes more stable under fuel-rich condition than the fuel-lean condition. Heat recirculation can effectively preheat the inner tube and can increase heptane evaporation, but flame oscillation may occur due to droplet falling and fast evaporation.