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対向流平面火炎を利用した噴霧の群燃焼挙動と火炎伝播促進機構に関する研究

逆流平面火焰喷雾群体燃烧行为及火焰传播促进机理研究

基本信息

批准号：
08455105
负责人：
KATSUKI Masashi
金额：
$ 4.74万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455105/
关键词：
Spray Combustion 2-D counterflow Spray Flame Laser Measurement Chemiluminescence Particle Mie Scattering High Speed Image Image Processing Particle Tracking Velocimetry 2次元対向流噴霧火災火災発光

项目摘要

Detail observation of a spray flame propagation phenomena is difficult using an usual jet spray flame, so we has been observed it using counterflow flat spray flame. Laminar premixed spray and counter air were issued in opposite, and flat spray flame stabled. Several techniques for measurement of a spray flame were adopted for that flame ; chemiluminescences, droplets Mie scattering, Phase Doppler Anemometry (PDA) and newly developed Particle Tracking Velocimetry and Sizing.(1) Laminar 2-D counterflow type spray burner was constructed to eliminate optical backgroubd signal. A target is elucidation of a structure of a spray flame front, so flame stability is essential.(2) OH chemiluminescence, CH band and droplet Mie scattering were measured along the burner axis, where the flame structure was appeared. Chemical reaction is stronger in blue flame region than in luminous flame region.(3) Droplets velocities and diameters were measured with PDA,and many-data were derived such as diameter distribution and number density.(4) Laser tomography was done with Argon-ion Laser and high speed CCD camera. The droplets velocities were measured with Particle Tracking Velocimetry (PTV) and their diameters were measured from their Mie scattering intensities. So many useful quantities were estimated such as number density and evaporation rate. Additionally the method provides a Lagrangian droplet data (velocity and diameter history).(5) OH chemiluminescence, CH band and Mie scattering intensity with a high spatial resolution collecting optics, MICRO,which was developed in our laboratory, and droplets velocities and diameters were measured simultaneously. It was elucidated that the flame front is premixed combustion phenomenon.(6) As an overall conclusion, we deduced the structure of 2-D counterflow spray flame.

采用常规的喷射式火焰很难对喷射火焰的传播现象进行详细观察，因此采用逆流式扁平火焰对其进行了观察。层流预混喷雾与反喷空气相对喷射，平喷火焰稳定。喷雾火焰的测量采用了几种技术；化学发光，液滴米氏散射，相位多普勒风速测定（PDA）和新发展的粒子跟踪测速和施胶。(1)构造层流二维逆流式喷雾燃烧器，消除光背景信号。一个目标是阐明一个结构的喷雾火焰前，因此火焰稳定性是必不可少的。(2)沿着火焰结构出现的燃烧器轴向测量OH化学发光、CH波段和液滴Mie散射。蓝色火焰区的化学反应比发光火焰区的强。(3)利用PDA测量了液滴的速度和直径，得到了液滴直径分布和数密度等数据。(4)激光层析成像采用氩离子激光器和高速CCD相机。用粒子跟踪测速仪（PTV）测量液滴的速度，用Mie散射强度测量液滴的直径。因此估计了许多有用的数量，如数量密度和蒸发速率。此外，该方法还提供了拉格朗日液滴数据（速度和直径历史）。(5)利用本实验室研制的高空间分辨率采集光学系统MICRO同时测量OH化学发光、CH波段和Mie散射强度，并测量液滴的速度和直径。阐明了火焰前缘是一种预混燃烧现象。(6)作为总体结论，推导出了二维逆流喷雾火焰的结构。