Flame stability limits of premixed low-swirl combustion

被引:15
作者
Xiao, Yinli [1 ]
Cao, Zhibo [1 ]
Wang, Changwu [1 ]
机构
[1] Northwestern Polytech Univ, Sch Engine & Energy, Xian 710072, Shaanxi, Peoples R China
来源
ADVANCES IN MECHANICAL ENGINEERING | 2018年 / 10卷 / 09期
基金
中国国家自然科学基金;
关键词
Low-swirl combustion; planar laser-induced fluorescence; particle image velocimetry; low emissions; lean blowout; LARGE-EDDY SIMULATION; TURBULENT FLAMES; EMISSIONS;
D O I
10.1177/1687814018790878
中图分类号
O414.1 [热力学];
学科分类号
摘要
The objective of this study is to gain a fundamental understanding of the flow-field and flame behaviors associated with a low-swirl burner. A vane-type low-swirl burner with different swirl numbers has been developed. The velocity field measurements are carried out with particle image velocimetry. The basic flame structures are characterized using OH radicals measured by planar laser-induced fluorescence. Three combustion regimes of low-swirl flames are identified depending on the operating conditions. For the same low-swirl injector under atmospheric conditions, attached flame is first observed when the incoming velocity is too low to generate vortex breakdown. Then, W-shaped flame is formed above the burner at moderate incoming velocity. Bowl-shaped flame structure is formed as the mixture velocity increases until it extinct. Local extinction and relight zones are observed in the low-swirl flame. Flow-field features and flame stability limits are obtained for the present burner.
引用
收藏
页数:11
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