| 基于内窥火焰传感器技术的超声速燃烧感知实验研究 |
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| 引用本文： | 李忠朋,周芮旭,孟凡钊,陈池,李拓,连欢.基于内窥火焰传感器技术的超声速燃烧感知实验研究[J].实验流体力学,2022,36(2):102-114. |
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| 作者姓名： | 李忠朋 周芮旭 孟凡钊 陈池 李拓 连欢 |
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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（91941104，11872366） |
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| 摘 要： | 高动态频响传感器及作动机构是高性能控制系统FADEC的关键技术之一。开发了一种基于被动火焰自发光谱的内窥式光纤火焰传感器进行光学诊断，初步验证了光纤火焰传感器数据的燃烧过程感知价值。基于中国科学院力学研究所的直连式超声速燃烧实验台，模拟了来流总温1475 K、总压1.68 MPa、马赫数5.6的发动机工作状态。在不同当量比和动量通量比条件下，使用新开发的内窥式光纤火焰传感器，测量了以CH*表征的燃烧释热率和以C2*/CH*表征的局部当量比。结果表明:内窥式光纤传感器可感知燃烧室释热率的时空演变特性；内窥式光纤传感器可感知频域燃烧振荡特性，实验表明燃烧过程可能存在展向的热声振荡现象；内窥式光纤传感器C2*/CH*光信号可感知局部当量比的时空演变特性，结合CH*光信号可应用于混合场与燃烧场关联性的研究；局部火焰质心位置的统计特征表征了剪切层稳焰模式和射流尾迹稳焰模式。
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| 关 键 词： | 内窥火焰传感器 燃烧感知 超声速燃烧 释热率 局部当量比 |
| 收稿时间： | 2022-01-11 |
Supersonic combustion sensing by the passive endoscopic flame sensor |
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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 100190, China |
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| Abstract: | The improvement of ramjet performance in the future wide-area flight envelope requires advanced combustion organization strategies and engine system control technology. Among them, high-dynamic frequency response sensors and actuators are one of the key technologies of the high-performance control system FADEC. Stable and reliable, simple structure, non-intrusive, low energy consumption, and light weight are the basic requirements of the ramjet online sensors. This paper develops an optical fiber flame sensor based on passive flame chemiluminescence for optical diagnosis, andpreliminarily verifies the value of the optical fiber flame sensor's data for sensing the combustion process. Based on the direct-connected supersonic combustion test bed of the Institute of Mechanics, Chinese Academy of Sciences, the flight conditions with a total incoming flow temperature of 1475 K, a total incoming pressure of 1.68 MPa and an incoming Mach number of 5.6 are simulated. Using a newly developed endoscopic fiber optic flame sensor, the combustion heat release rate characterized by CH* and the local equivalence ratio characterized by C2*/CH* were measured under different equivalence ratios and momentum-to-flux ratios. The analysis results show that the endoscopic optical fiber sensor can sense the temporal and spatial evolution characteristics of the heat release rate of the combustion chamber; The endoscopic fiber optic sensor can sense the combustion oscillation characteristics in the frequency domain, and experiments show that there may be spanwise thermoacoustic oscillations in the combustion process; The C2*/CH* optical signal of the endoscope optical fiber sensor can perceive the temporal and spatial evolution characteristics of the local equivalence ratio, and can be combined with the CH* optical signal to study the correlation between the mixed field and the combustion field; The statistical characteristics of the local flame centroid position characterized the shear-layer flame stabilization mode and jet wake flame stabilization mode. |
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