Experimental studies of flame stability and emission characteristics of simple LPG jet diffusion flame
Experimental studies of flame stability and emission characteristics of simple LPG jet diffusion flame
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DOI：
10.1016/j.fuel.2006.10.027
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发表时间：
2007-07
期刊：
影响因子：
7.4
通讯作者：
D. Kiran;D. Mishra
中科院分区：
文献类型：
--
作者：
D. Kiran;D. Mishra
本文对液化石油气（LPG）射流扩散火焰的升离高度、HL、火焰长度、Lf和吹离速度进行了实验测量。据观察，离地高度与燃料出口速度Uf成比例。提出了提离高度与整体应变率Uf/Df之间的半经验关系式。确定为浮力或动量为主的两个制度的特点是弗劳德数，Fr。动量为主的射流扩散火焰，Lf/Df几乎保持不变，因此是独立的弗劳德数。NOx排放量（以排放指数EINOx表示）随着Uf的增加而减少。这种下降趋势与文献中报道的增加射流速度减少停留时间的概念一致。目前的数据也与丙烷气体的可用数据进行了比较，发现是在良好的协议，特别是在趋势方面。除此之外，EINOx标度律也在本研究中报道。
In the present study, experiments were carried out to measure the lift-off height, HL; flame length, Lfand blow-off velocity for a simple LPG (liquefied petroleum gas) jet diffusion flames. It is observed that lift-off height is proportional to the fuel exit velocity, Uf. A semi-empirical correlation between lift-off height and global strain rate, Uf/Dfis proposed. Two regimes identified either as buoyancy or momentum dominated were characterized by Froude number, Fr. For momentum dominated jet diffusion flames, Lf/Dfremains almost constant and therefore is independent of the Froude number. The NOxemissions, expressed in terms of emission index, EINOxis found to decrease with Uf. This decreasing trend is consistent with the concept that increasing jet velocity reduces the residence time as reported in the literature. The present data is also compared with the available data of propane gas and found to be in good agreement well particularly in trend wise. Besides these data, EINOxscaling law is also reported in the present study.