Ignition characteristics in evaporating Z-shaped pilot flame-holder

被引：0

作者：

Miao J. ^{[1
]}

Fan Y. ^{[1
]}

Wu W. ^{[1
]}

Zhao S. ^{[1
]}

机构：

[1] Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing

来源：

| 2020年 / BUAA Press卷 / 35期

关键词：

Droplet distribution; Evaporating Z-shaped pilot flame-holder; Flamelet growth; Ignition characteristics; Ignition position;

D O I：

10.13224/j.cnki.jasp.2020.07.013

中图分类号：

学科分类号：

摘要：

The ignition characteristics in an evaporating Z-shaped flame-holder were experimentally studied. The kernel formation and flamelet growth at various ignition positions were acquired using high-speed photography and image processing, and the droplet size and distribution in addition to the time-averaged flame structure in the recirculation zone were analyzed. The experimental results showed that, compared with the traditional film evaporation flameholder, the evaporating Z-shaped flameholder can decrease the lean ignition and blowout equivalence ratios by 31.1% and 19.4% when Mach number was over 0.2. The formation of the initial kernel was related to the ignition position, caused by the double-reaction-zone morphology in the Z-shaped evaporating flame-holder. When the kernel generation was more contributed by the second reaction zone, the ignition performance of the Z-shaped evaporating flame-holder was better and the flamelet growth was faster. The ignition capacity was better when the ignition position was near the lower corner of Z-gutter, and got worse when the ignition position moved to the interface of recirculation zone and mainstream; meanwhile, the non-uniformity of oil mist attributed to the low fuel evaporation rate in the evaporation tube under low temperature and high speed conditions caused the transverse difference in lean ignition performance. © 2020, Editorial Department of Journal of Aerospace Power. All right reserved.

引用

页码：1457 / 1465

页数：8

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