凸台扰流结构对火焰动态特性的影响

赵世龙; 李亚凡; 肖辉; 范育新

doi:10.13224/j.cnki.jasp.20230214

凸台扰流结构对火焰动态特性的影响

doi: 10.13224/j.cnki.jasp.20230214

1.
中山大学航空航天学院，深圳 518107
2.
南京航空航天大学能源与动力学院，南京 210016

基金项目: 航空发动机及燃气轮机基础科学中心项目（P2022-B-Ⅱ-018-001）

详细信息

作者简介:
赵世龙（1990-），男，讲师，博士生，研究方向为航空发动机燃烧技术。E-mail：zhaoshilong@mail.sysu.edu.cn

中图分类号: V231.2
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- 被引次数: 0
出版历程
- 收稿日期: 2023-04-04
- 网络出版日期: 2024-05-10

Influence of the lug turbulator on flame dynamic characteristics

1.
School of Aeronautics and Astronautics，Sun Yat-sen University，Shenzhen 518107，China
2.
College of Energy and Power Engineering，Nanjing University of Aeronautics and Astronautics，Nanjing 210016，China

摘要

摘要:
支板稳定器是多模态冲压燃烧室的关键部件，稳焰区具有多回流区耦合和多剪切层散布等特点，火焰稳定困难且火焰结构表现复杂的动态特征。以带有/无凸台扰流结构的支板稳定器为研究模型，采用高频ICCD（增强电荷耦合器件）拍摄部分预混火焰图像、双铂铑热电偶测试出口温度，发展部分预混动态火焰关键特征参量的定向选择、时空关联解耦、脉动识别、均值计算、最大概率密度分布等算法，构建部分预混动态火焰表征方法。研究结果表明：凸台扰流结构有助于脉动振荡区和共轭温度场前移，强化燃油在主回流区二次雾化，增强火焰的多向传播能力。凸台扰流结构具有提高火焰稳定性、燃烧室温度分布均匀性的能力；楔形凸台扰流结构可以使火焰扩张比增大5.2%～29.4%，而三角形凸台扰流结构可以在相同进口条件下，将燃烧室出口温度提高40 K以上，达到提高燃烧室出口温度目的。
- 加力燃烧室 /
- 支板稳定器 /
- 凸台扰流结构 /
- 火焰动态特征 /
- 火焰演变规律
Abstract:
The strut flameholder is a key component of the multi-mode ram combustor. The stabilization zone has the characteristics of refluxes coupling and shear layers dispersion, the flame stability is difficult and the flame structure presents complex dynamic characteristics. A strut flameholder with/without lug turbulator was taken as the research model, a high-frequency ICCD （intensified charge coupled device） was adopted to shoot partially premixed flame image, and the exit temperature was tested with double platinum-rhodium thermocouple. At the same time, algorithms was developed for the directional selection of key characteristic parameters, spatio-temporal correlation decoupling, pulsation recognition, mean value calculation, maximum probability density distribution, etc. A dynamic flame characterization method was constructed. As shown, the lug turbulator was conducive to the forward lead of pulsating oscillation zone and conjugate temperature field, which strengthened the secondary atomization of fuel in the main reflux zone, and enhanced the multi-direction propagation of flame. Lug turbulators improved the flame stability and the uniformity of outlet temperature distribution under the premise of not significantly increasing the flow resistance. The wedge lug increased the flame expansion ratio by 5.2%—29.4%, while the triangle lug increased the combustion chamber outlet temperature by more than 40 K under the same inlet conditions to achieve the purpose of improving combustion efficiency.
- afterburner /
- strut flameholder /
- convex spoiler structure /
- flame dynamic characteristics /
- flame evolution law

HTML

图 1 不同凹腔供油当量比对应的火焰形态

Figure 1. Flame morphology corresponding to different cavity oil supply equivalent ratios

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图 2 强旋-V型钝体部分预混火焰扩散机制

Figure 2. Diffusion mechanism of strongly swirling V-shaped bluff body partially premixed flames

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图 3 不同当量比下的值班火焰结构及传播过程

Figure 3. Duty flame structure and propagation process under different equivalent ratios

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图 4 淬熄过程稳焰机理

Figure 4. Flame stabilization mechanism during quenching process

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图 5 两种增强扰动设计的支板稳定器

Figure 5. Two types of strut flameholder with enhanced disturbance design

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图 6 增强型梯度法火焰图像处理思路及流程

Figure 6. Enhanced gradient method flame image processing ideas and flow

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图 7 未处理的火焰拍摄图像

Figure 7. Unprocessed flame capture image

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图 8 处理后的火焰边界提取及参数标定示意

Figure 8. Schematic diagram of processed flame boundary extraction and parameter calibration

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图 9 去除辐射光与未去除辐射光的火焰边界比较

Figure 9. Comparison of flame boundaries with/without radiation removed

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图 10 本征正交分解的能量图谱

Figure 10. Energy spectrum of intrinsic orthogonal decomposition

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图 11 不同凸台高度前两阶模态结构

Figure 11. The first two modal structures with different lug heights

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图 12 第1阶模态频谱图

Figure 12. First order modal spectrum diagram

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图 13 有、无楔形扰流结构下火焰扩张比的变化规律

Figure 13. Variation of flame expansion ratio with/without wedge shaped turbulators

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图 14 不同楔形凸台高度下火焰扩张比的变化规律

Figure 14. Variation of flame expansion ratio under different wedge lug heights

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图 15 双铂铑热电偶排布位置示意图

Figure 15. Layout diagram of double platinum rhodium thermocouples

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图 16 有、无三角形凸台扰流结构时火焰稳定器下游的温度分布

Figure 16. Temperature distribution downstream of flameholder with/without triangular lug turbulator

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图 17 有、无三角形凸台扰流结构下的出口平均温度变化规律

Figure 17. Average outlet temperature variation rule with/without triangular lug turbulator

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