CH<sub>4</sub>/H<sub>2</sub>分级旋流火焰形态及外加声激励响应特性

刘昆鹏; 傅宸; 王晓阳; 王梦; 孟晟; 孔成栋; 张漫; 高怡

doi:10.13224/j.cnki.jasp.20240341

CH₄/H₂分级旋流火焰形态及外加声激励响应特性

doi: 10.13224/j.cnki.jasp.20240341

刘昆鹏^1,,
傅宸¹,
王晓阳¹,
王梦¹,
孟晟²,
孔成栋^1,*, ,,
张漫²,
高怡¹

1.
上海交通大学，上海 200240
2.
中国航发商用航空发动机有限责任公司，上海 200241

基金项目: 国家自然科学基金（U2141221，52076136）；国家科技重大专项（J2019-Ⅲ-0004-0047，Y2022-Ⅲ-0001-0010）；航空发动机及燃气轮机基础科学中心项目（P2022-B-Ⅱ-019-001）；上海市自然科学基金（22ZR1467900，23ZR1481400）

详细信息

作者简介:
刘昆鹏（1998-），男，硕士生，主要从事掺氢火焰燃烧的研究。E-mail：liuu159357@sjtu.edu.cn

通讯作者:
高怡（1982-），女，副教授，博士，主要从事湍流燃烧激光诊断技术及应用研究。E-mail：gaoyisjtu@sjtu.edu.cn

中图分类号: V231.2
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出版历程
- 收稿日期: 2024-05-27
- 网络出版日期: 2024-12-04

Morphology and response characteristics of CH₄/H₂ staged swirling flame to external acoustic forcing

1.
Shanghai Jiao Tong University，Shanghai 200240，China
2.
Commercial Aircraft Engine Company Limited，Aero Engine Corporation of China，Shanghai 200241，China

摘要

摘要:
通过实验研究了掺氢比及分级比对CH₄/H₂分级旋流火焰形态及声激励响应特性的影响。使用OH*化学发光技术（OH*-CL）和粒子图像测速技术（PIV）分别获得了火焰热释放及流场信息。结果表明：在无氢气掺混的低分级比条件下，火焰呈现D型。保持低分级比不变，随着掺氢比增加，火焰形态转变为S型，火焰整体长度逐渐减小。在高分级比时，火焰变为L型。此外，通过对来流空气施加不同振幅的200 Hz速度脉动，分析了不同掺氢比及分级比下的火焰响应特性。掺氢比及分级比通过改变火焰形态，进而影响燃烧室不同位置对速度脉动的敏感程度，导致了不同程度的主频响应。具体而言，随掺氢比增加，S型火焰热释放响应提升。然而，随着分级比的增加，L型火焰热释放响应降低。以上研究结果对于优化现有燃烧室低排放设计，推进氢气发动机的发展具有重要意义。
- 火焰形态 /
- 热声响应特性 /
- 掺氢 /
- 分级旋流 /
- OH*化学发光 /
- 粒子图像测速技术（PIV）
Abstract:
The effects of hydrogen fraction and stratification ratio on the CH₄/H₂ staged swirling flame morphology and acoustic forcing response characteristics were investigated through experimental research. The OH* chemiluminescence (OH*-CL) technique and particle imaging velocimetry (PIV) were used to obtain information on heat release and flow field, respectively. The results showed that, under low stratification ratio conditions, the D-shape flame was discovered in the case of absence of hydrogen blending. Under the conditions with the low stratification ratio, the flame transitioned to an S-shape flame as the hydrogen fraction increased, while the overall flame length gradually decreases. Under conditions with high stratification ratio, the flame changed into L-shaped. Furthermore, velocity fluctuations with varying amplitude at 200 Hz were applied to the incoming air, the flame response characteristics under different hydrogen fractions and stratification ratios were analyzed. The different position in the combustor exhibited different sensitivity to velocity fluctuations by altering the flame morphology influenced by the hydrogen fraction and stratification ratio, resulting in varying response levels of primary frequency. Specifically, as the hydrogen fraction increased, the heat release response of the S-shaped flame was enhanced. However, with the increase in stratification ratio, the heat release response of the L-shaped flame diminished. These findings are significant for optimizing low-emission combustor designs and advancing the development of hydrogen engines.
- flame morphology /
- thermoacoustic response characteristics /
- hydrogen blending /
- staged swirl /
- OH* chemiluminescence /
- particle imaging velocimetry (PIV)

HTML

图 1 分级旋流燃烧器结构简图和气路布置（单位：mm）

Figure 1. Experimental arrangement of staged swirl burner（unit：mm）

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图 2 光学测量系统示意图

Figure 2. Schematic of the optical measurement system

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图 3 光学测量系统时序关系图

Figure 3. Timing relationship diagram of the optical measurement system

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图 4 不同工况对应的火焰OH*化学发光时均图像

Figure 4. Time-averaged images of OH* chemiluminescence for different cases

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图 5 不同火焰形态下的流场结构

Figure 5. Flow field structures under different flame morphologies

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图 6 火焰长度变化

Figure 6. Variations of flame length

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图 7 不同火焰形态的局部响应图像

Figure 7. Local response images of different flame morphologies

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图 8 不同速度脉动幅值下的火焰响应特性

Figure 8. Flame response characteristics under different velocity fluctuation amplitudes

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图 9 S型火焰轴向强度分布

Figure 9. S-shaped flame axial intensity distribution

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图 10 分级比对L型火焰热释放响应特性影响

Figure 10. Effect of stratification ratios on the heat release response characteristics of L-shaped flames

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图 11 不同速度脉动幅值下的火焰PSD函数

Figure 11. PSD functions of flames under different velocity fluctuation amplitudes

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表 1 实验工况设置

Table 1. Experimental conditions

工况编号	来流速度/ （m/s）	热输入/ kW	分级比 γ_s	掺氢比 α	总当量比 φ
Case 1	12	27.5	1∶9	0	0.50
Case 2				0.2	0.46
Case 3				0.4	0.43
Case 4				0.6	0.39
Case 5			3∶7	0	0.50
Case 6				0.2	0.46
Case 7				0.4	0.43
Case 8				0.6	0.39
Case 9			5∶5	0	0.50
Case 10				0.2	0.46
Case 11				0.4	0.43
Case 12				0.6	0.39

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