Laser diagnostics of premixed bluff-body stabilized and lift-off flame in confined space

被引：0
|
作者：
Lin W. [1 ]
Mao R. [1 ]
Zhang W. [1 ]
Zhang M. [1 ]
Li J. [2 ]
Wang J. [1 ]
Huang Z. [1 ]
机构：
[1] State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
[2] Aero Engine Academy of China, Aero Engine Corporation of China, Beijing
来源：
Hangkong Dongli Xuebao/Journal of Aerospace Power | 2021年 / 36卷 / 07期
关键词：
Confined space; Particle image velocimetry(PIV); Planar laser-induced fluorescence(PLIF); Premixed bluff-body flames; Rayleigh scattering thermometry;
D O I：
10.13224/j.cnki.jasp.20200422
中图分类号：
学科分类号：
摘要：
In a confined premixed bluff-body combustor, OH-PLIF (planar laser-induced fluorescence), PIV (particle image velocimetry) and Rayleigh scattering thermometry technologies were used to experimentally study the relationship among the flame structure, flow field and temperature field. Methane/air premixed flames under fuel lean stable and fuel rich lift-off states were compared and analyzed. Experimental results showed that there was a strong correlation among flame structure, flow field and temperature field. For fuel lean state (equivalence ratio of 0.8), the high temperature and low velocity inner-recirculation zone above the bluff-body helped maintain the stable flame; for fuel rich state (equivalence ratio of 1.2), the flame was prone to ignite after being entrained with the outside air, the low velocity and low temperature inner-recirculation zone similar to cold condition above the bluff-body cannot ignite the rich premixed gas, thus forming a lift-off flame. By analyzing the local distribution of the flame field, the field-to-field interdependency of premixed bluff-body flame was obtained: in bluff body flame, high temperature and low velocity zone corresponded to the burned zone, while low temperature and high velocity zone corresponded to unburned zone. © 2021, Editorial Department of Journal of Aerospace Power. All right reserved.
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页码：1443 / 1451
页数：8
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