Development of high-speed spectrometer system with high spatial and wavelength resolution and the application to flame diagnostics

高空间和波长分辨率高速光谱仪系统的研制及其在火焰诊断中的应用

• 批准号: 12355010
• 负责人: KATSUKI Masashi
• 金额: $ 27.51万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12355010/
• 关键词: Chemiluminescence; Spectrum of Flame Luminescence; Temperature Measurement; Excited Species; Reaction Zone Structure; Time-series Measurement; High Resolution Measurement; Simultaneous Multi-component Measurement

The purpose of the previous study was to investigate the local flamefiont structure and its chemistry by the spatial and temporal behavior of excited radicals, flame stoichiometry, heat release and chemical reaction process. Spatially, temporally, and spectrally resolved chemiluminescence measurements of electronically excited radicals in a flame such as OH^*, CH^*, and C_2^* was carried out to observe the time evolution of chemical reactions in fluid flows. Firstly, we developed an optical measurement technique using specially designed Cassegrain Optics minimized of spherical aberration to detect emissions locally in flames and highspeed (1 MHz) spectrum detectors with gratings. The Cassegrain Optics was coupled with a single core fiber optic so that the light detected with good spatial resolution was guided to spectrometers. Obtained timeseries signals of omission intensities were analyzed statistically as well as instantaneously.Distributions of local flame temperabe and chemilumine … More scence of OH^*, CH^* and C_2^* radicals were simultaneously measured in laminar diffusion flames and laminar premixed flames. The tempffature measurement is based on the Rayliegh scatering method. The Cassegrain optics was used-to measure the chemiluminescence and Rayleigh scattering with high spatial resolution. Relationships between the local flame temperature and chemiluminescence intensities were examined.Temperature measurement method using C_2 band emission intensity ratio is applied to the measurement of timeresolved local temperature in premixed flames. First of all, the relationship between temperature and each peaks of C_2 emission intensity is calculated by using quantum physical theory. We try to know te relationship between local temperature in flame and emission intensity ratio of C_2 chemiluminescence by using experimental method. The temperature obtained from emission intensity ratio is the vibrational temperature of C_2 in the local region of flame. The C_2 vibrational temperature has the possibility to be higher than the temperature in thermal equilibrium state. The temperature measured by thermocouples is used as the temperature in thermal equilibrium state in the present study. The objectives in the present study are to measure local chemiluminescence of premixed laminar flames of propane or methane and air with the Cassegrain optical system and spectroscope unit and to investigate the relationship between temperature measured by thermocouples and C_2 band emission intensity ratio as precise as possible. By changing the temperature in premixed laminar propane/air flames by the difference of the equivalence ratio, the relationship between temperature measured by thermocouples and C_2 band emission intensity ratio can be considered to be a linear fimction. By changing the temperature by diluting with N2, those relationships become linear as well. These measurement methods are applied to premixed methane/air vibrated flames. The Cassegrain optical system and the spectroscope unit are used to measure local chemiluminescence in local region of vibrated premixed flame. The measured chemiluminescence intensity parts with enough strong emission intensity are chosen by numerical processing and the parts show the similar relationships with thermal temperature measured by thermocouples as observed in premixed laminar flames. Less

前期研究的目的是通过激发自由基的时空行为、火焰化学计量学、热释放和化学反应过程来研究局部火焰的结构及其化学性质。对OH^*、CH^*和C_2^*等电子激发自由基在火焰中的化学发光进行了空间分辨、时间分辨和光谱分辨的测量，以观察流体中化学反应的时间演化。首先，我们开发了一种光学测量技术，使用特别设计的最小化球差的卡塞格伦光学和高速（1 MHz）带光栅的光谱探测器来检测火焰中的局部发射。卡塞格伦光学系统与单芯光纤相结合，这样以良好的空间分辨率检测到的光被引导到光谱仪。得到的遗漏强度时间序列信号进行了统计分析和即时分析。在层流扩散火焰和层流预混火焰中同时测定了OH^*、CH^*和C_2^*自由基的分布。温度测量基于瑞利散射法。采用卡塞格伦光学测量了高空间分辨率的化学发光和瑞利散射。研究了局部火焰温度与化学发光强度之间的关系。将C_2波段发射强度比测温方法应用于预混火焰中时间分辨局部温度的测量。首先，利用量子物理理论计算了温度与C_2发射强度各峰之间的关系。采用实验方法，试图了解火焰局部温度与C_2化学发光强度比之间的关系。由发射强度比得到的温度即为C_2在火焰局部区域的振动温度。C_2的振动温度有可能高于热平衡态温度。本研究采用热电偶测得的温度作为热平衡状态的温度。本研究的目的是利用卡塞格伦光学系统和分光镜装置测量丙烷或甲烷与空气预混层流火焰的局部化学发光，并尽可能精确地研究热电偶测得的温度与C_2波段发射强度比之间的关系。通过等效比的差异改变丙烷/空气预混层流火焰中的温度，热电偶测得的温度与C_2波段发射强度比的关系可以认为是线性函数关系。通过用N2稀释来改变温度，这些关系也变成了线性关系。这些测量方法适用于预混甲烷/空气振动火焰。利用卡塞格伦光学系统和分光镜单元测量了振动预混火焰局部区域的局部化学发光。通过数值处理选择发射强度足够强的被测化学发光强度部分，其与热电偶测得的热温度的关系与在预混层流火焰中观察到的相似。少

项目成果

小嶋潤, 池田裕二, 中島健: "火炎構造診断のための化学発光計測(層流予混合火炎における基礎特性と乱流予混合火炎への適用性)"日本機械学会論文集B編. 69・678. 482-489 (2003)

Jun Kojima、Yuji Ikeda、Ken Nakajima：“火焰结构诊断的化学发光测量（层流预混火焰的基本特性以及对湍流预混火焰的适用性）”日本机械工程师学会会刊，B 版。 (2003)

Y, Ikeda, J, Kojima, T, Nakajima: "Fast Response Local Equivalence Ratio Measurement in Premixed Turbulent Flame"Proceedings of the 2^<nd> Symposium on Smart Control of Turbulence. 155-160 (2001)

Y，Ikeda，J，Kojima，T，Nakajima：“预混湍流火焰中的快速响应局部当量比测量”第二届湍流智能控制研讨会论文集。

Y, Ikeda, J, Kojima, T, Nakajima: "Chemiluminescence Based Local Equiva[ence Ratio Measurement in Turbulent Premixed Flames"40^<th> AIAA Aerospace Sciences Meeting and Exhibit. AIAA:paper, Reno. 2002-0193 (2002)

Y、Ikeda、J、Kojima、T、Nakajima：“湍流预混火焰中基于化学发光的局部当量比测量”第 40 届 AIAA 航空航天科学会议和展览。

J, Kojima, Y, Ikeda, T, Nakajima: "Multi-Point Time-Series Observation of Optical Emissions for Flame-Front Motion Analysis"Measurement Science and Technology. (in print).

J、Kojima、Y、Ikeda、T、Nakajima：“用于火焰前运动分析的光发射的多点时间序列观测”测量科学与技术。

S.Tsushima, H.Saitoh, F.Akamatsu, M.Katsuki: "Macroscopic Flame Structure in a Premixed-Spray Burner"JSME International Journal Ser.B. 44・4. 616-623 (2001)

S.Tsushima、H.Saitoh、F.Akamatsu、M.Katsuki：“预混合喷雾燃烧器中的宏观火焰结构”JSME 国际期刊 Ser.B 44・4（2001）。