| 旋流火焰燃烧温度场二维吸收光谱诊断 |
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| 引用本文： | 林鑫,李飞,王宽亮,余西龙. 旋流火焰燃烧温度场二维吸收光谱诊断[J]. 气体物理, 2019, 4(2): 55-61. DOI: 10.19527/j.cnki.2096-1642.0748 |
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| 作者姓名： | 林鑫 李飞 王宽亮 余西龙 |
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| 作者单位： | 1.中国科学院力学研究所高温气体动力学国家重点实验室，北京 100190 |
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| 基金项目： | 国家自然科学基金11802315 |
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| 摘 要： | 针对旋流火焰的复杂流场结构,结合可调谐二极管吸收光谱技术(tunable diode laser absorption spectroscopy , TDLAS)和多光谱层析成像术(hyperspectral tomography , HT),发展了具有空间分辨能力的二维吸收光谱测量技术(tunable diode laser absorption tomography , TDLAT),实现了甲烷/空气旋流火焰不同高度的二维温度场测量.该TDLAT系统吸收波长为7 185.6 , 7 444.3 , 6 807.8和7 466.3 cm -1 四线,采用分时-直接吸收探测策略,测量频率2.5 kHz ,采用13×13路正交光路(空间分辨率7 mm),采用模拟退火算法进行数据重建.经与理论计算结果对比分析,重建结果真实地反映了旋流火焰温度场的二维分布.
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| 关 键 词： | 旋流火焰 可调谐二极管吸收光谱技术 多光谱层析成像术 二维重建 模拟退火算法 |
| 收稿时间： | 2019-01-05 |
Diode Laser Absorption Tomography for Swirling Flame Diagnostics |
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| LIN Xin,LI Fei,WANG Kuan-liang,YU Xi-long. Diode Laser Absorption Tomography for Swirling Flame Diagnostics[J]. Physics of Gases, 2019, 4(2): 55-61. DOI: 10.19527/j.cnki.2096-1642.0748 |
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| Authors: | LIN Xin LI Fei WANG Kuan-liang YU Xi-long |
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| Affiliation: | 1.State Key Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China2.School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The swirl burner plays an important role in the aero-engine combustor. Accurate diagnosis of the heat release rate distribution is helpful for studying thermos-acoustic instabilities, flame shape transition and turbulence-chemistry interactions in the swirl flames. Tunable diode laser absorption spectroscopy (TDLAS) is a powerful tool with which to probe atoms and molecules non-intrusively and has been used in combustion diagnostics. Combined with hyperspectroscopy tomography (HT), TDLAS can improve its spatial resolution. The diagnostics system was composed of 26 beams (13×13, 13 parallel beams and 13 vertical beams). Four water vapor absorption lines, 7 185.6, 7 444.3, 6 807.8, 7 466.3 cm-1, were utilized in each beam using time-division-multiplexed method at total measuring frequency of 2.5 kHz. A reconstruction routine based on simulated-annealing algorithm was used to reconstruct the two-dimensional distribution of temperature and H2O concentration. Comparisons with CFD simulations show that the reconstruction results reflect the real two-dimensional distribution of temperature in the swirl flame. |
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| Keywords: | swirl flame tunable diode laser absorption spectroscopy (TDLAS) hyperspectral tomography (HT) two-dimensional reconstruction simulated-annealing algorithm |
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