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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.

使用普通的喷射火焰很难详细观察喷雾火焰的传播现象，因此我们使用逆流平面喷雾火焰观察了它。层流预混喷雾与反向空气相向而出，平面喷雾火焰稳定。采用了几种测量喷雾火焰的技术，用于测量火焰;荧光，液滴米氏散射，相位多普勒风速仪（PDA）和新开发的粒子跟踪速度和尺寸。(1)为了消除光背景信号，设计了层流二维逆流式喷雾燃烧器。目标是阐明喷雾火焰前缘的结构，因此火焰稳定性是必不可少的。(2)沿燃烧器轴线沿着测量了OH化学发光、CH谱带和液滴Mie散射，发现火焰结构出现在轴线上。化学反应在蓝色火焰区比在发光火焰区强。(3)用PDA测量了液滴的速度和直径，得到了液滴的直径分布和数密度等数据。(4)采用氩离子激光器和高速CCD摄像机进行激光层析成像。用粒子跟踪测速仪（PTV）测量液滴速度，并从它们的Mie散射强度测量它们的直径。因此，许多有用的量，如数量密度和蒸发速率估计。此外，该方法提供了拉格朗日液滴数据（速度和直径历史）。(5)OH化学发光、CH带和Mie散射强度以及液滴速度和直径的同时测量。阐明了火焰前锋是一种预混燃烧现象。(6)在此基础上，推导出了二维逆流喷雾火焰的结构。