斜壁限制域台阶对火焰宏观结构的影响

覃子宇; 韩啸; 李磊; 林宇震; 王思睿; 徐亮亮

doi:10.13224/j.cnki.jasp.20230225

斜壁限制域台阶对火焰宏观结构的影响

doi: 10.13224/j.cnki.jasp.20230225

覃子宇^1,,
韩啸^1,*, ,,
李磊¹,
林宇震¹,
王思睿²,
徐亮亮²

1.
北京航空航天大学航空发动机研究院，北京 100191
2.
上海交通大学机械与动力工程学院，上海 200240

基金项目: 国家自然科学基金（52106128）；航空发动机及燃气轮机基础科学中心项目（P2022-A-Ⅱ-006-001）；中央高校基本科研业务费专项资金

详细信息

作者简介:
覃子宇（2000-），男，博士生，主要从事航空发动机燃烧室中流动与燃烧研究。E-mail：qinziyu@buaa.edu.cn

通讯作者:
韩啸（1993-），男，副研究员，博士，主要从事低排放燃烧室设计、燃烧振荡机理与控制研究。E-mail：han_xiao@buaa.edu.cn

中图分类号: V231.2
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出版历程
- 收稿日期: 2023-04-06
- 网络出版日期: 2024-07-16

Influence of slope-wall confinement step on flame macrostructure

QIN Ziyu^1
,,
HAN Xiao^{1,*
, ,},
LI Lei¹,
LIN Yuzhen¹,
WANG Sirui²,
XU Liangliang²

1.
Research Institute of Aero-Engine，Beihang University，Beijing 100191，China
2.
School of Mechanical Engineering，Shanghai Jiao Tong University，Shanghai 200240，China

摘要

摘要:
斜壁限制域是一种有效的燃烧振荡被动控制方法。为深入认识其火焰稳定特性，探究斜壁限制域台阶高度对火焰宏观结构的影响规律。数值仿真表明增大台阶高度使火焰宏观结构从V型转变为M型。通过定量计算火焰拉伸率，发现这一转变伴随着斜壁过渡段外侧出现明显的强拉伸流动区域。结合小扰动线性稳定性理论对该现象加以解释，其原因可总结为结构特征尺度大于空间不稳定模态1/4波长尺度，进而固有的不稳定模态被激发，并形成稳定火焰的强拉伸区。运用该方法预测临界台阶高度，绝对误差不超过0.1 mm。
- 斜壁限制域 /
- 火焰宏观结构 /
- 火焰拉伸率 /
- 线性稳定性分析 /
- 空间模态
Abstract:
Slope-wall confinement is an effective passive control method for combustion oscillation. To deeply understand its flame stabilization characteristics, the influence of step height in the slope-wall confinement on the flame macrostructure was explored. Numerical simulation showed that increasing the height of the step changed the flame macrostructure from V-shaped to M-shaped structure. By quantitatively calculating the flame stretch rate, it was found that this transition was accompanied by the occurrence of an area with a significantly strong stretch flow on the outside of the slope-wall transition section. Combined with the small disturbance linear stability theory, the reason for this phenomenon can be summarized as the structural feature-length scale was larger than the spatial unstable mode 1/4 wavelength length scale. Thus, the inherently unstable mode was excited, and a region with a strong stretch rate for flame stabilization was formed. This method was used to predict the height of the critical step, through which the absolute error did not exceed 0.1 mm.
- slope-wall confinement /
- flame macrostructure /
- flame stretch rate /
- linear stability analysis /
- spatial mode

HTML

图 1 单旋流燃烧室示意图

Figure 1. Schematic diagram of the single-swirl combustor

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图 2 数值仿真结果

Figure 2. Numerical simulation result

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图 3 火焰锋面提取过程

Figure 3. Flame front extraction process

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图 4 不同台阶高度下轴向流场和火焰锋面

Figure 4. Axial flow field and flame front under different step heights

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图 5 不同台阶高度下的无量纲火焰拉伸率上界

Figure 5. Dimensionless flame stretch rate upper bound under different step heights

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图 6 基本流速度型分析

Figure 6. Analysis of the velocity profile of the base flow

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图 7 空间模态1/4波长与台阶高度的关系

Figure 7. Relationship between spatial mode 1/4 wavelength and step height

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图 8 临界台阶高度的验证

Figure 8. Validation of critical step height

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