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Measurement of Liquid Fuel Pyrolysis by Laser Induced Fluorescence

激光诱导荧光测量液体燃料热解

基本信息

批准号：
04650184
负责人：
YOSHIKAWA Norihiko
金额：
$ 1.28万
依托单位：
Toyohashi University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650184/
关键词：
Laser Fluorescence Combustion Liquid Fuel

项目摘要

1.Planar Measurement Using CCD CameraAn experimental technique of planar measurement with high spatial resolution are developed. Several important aspects of the fundamental techniques are carefully examined through the LIF measurement of OH radicals in flames. The spatial resolution of 10mum can be achieved, and the thickness of a laminar methane-air flame is determined 0.4mm. The strong noise effects of the image intensifier can be removed : integration of 1000-1500 times of the instantaneous measurements is required to ensure quanitatively accurate profiles of LIF intensities ; a smoothing techniques of 7x7 or 9x9 filter functions are introduced to eliminate the spatial high-frequency noise in an instantaneous picture of turbulent flames.2.Identification of Acetylene and Other HydrocarbonsA line of 215.9nm is used for the detection of C_2H_2. At high pressure conditions about 1atm, C_2H_2 photochemically dissociates into C_2, and the C_2 Swan band spectra above 300nm region can be used to detect the acetylene. At low pressure conditions typically in a C_2H_2-Air premixed flame at 105Torr, the LIF spectra of acetylene itself are observed in 215-216.5nm. A similar experiment of two-photon absorption of C_2H_4 in flames at 1atm was tried using 300-320nm lines, since C_2H_4 has a strong absorption band below 190nm. Neither LIF nor Swan band could be detected. More careful examinations on effective absorption lines are required.3.Future WorksThe measurements were not successful due to the very strong quenching effects in LIF technique at atmospheric pressures. Studies of low pressure flames are expected for ensuring the signal detections, though the direct quantitative comparison with the real conditions at higher pressures can not be achieved.

1.利用CCD摄像机进行平面测量发展了一种高空间分辨率的平面测量实验技术。通过火焰中OH自由基的LIF测量，仔细检查了基本技术的几个重要方面。空间分辨率可达10 μ m，层流甲烷-空气火焰厚度可达0.4mm。可以消除像增强器的强噪声影响：需要对瞬时测量值进行1000-1500次积分，以确保LIF强度的定量准确的轮廓;引入7 x 7或9 x 9滤波函数的平滑技术来消除空间高分辨率2.乙炔和其它烃类的鉴别用215.9nm的谱线检测乙炔。在1atm左右的高压条件下，C_2H_2光化学解离为C_2，C_2的300 nm以上的Swan带光谱可用于乙炔的检测。在105 Torr的C_2H_2-Air预混火焰中，在215-216.5nm范围内观察到乙炔本身的激光诱导荧光光谱。由于C_2H_4在190 nm以下有强的吸收带，我们用300- 320 nm谱线进行了1atm火焰中C_2H_4双光子吸收的类似实验。LIF和Swan带均未检出。需要对有效吸收线进行更仔细的检查。3.未来的工作由于大气压下激光诱导荧光技术中非常强的猝灭效应，测量没有成功。低压火焰的研究有望确保信号的检测，虽然不能实现与较高压力下的真实的条件的直接定量比较。