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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.

用通常的喷射火焰很难详细观察到喷雾火焰的传播现象，所以我们用逆流平面喷雾火焰对其进行了观察。层流预混喷雾和逆风反向喷射，平坦喷雾火焰稳定。对喷雾火焰的测量采用了多种技术：化学发光法、液滴Mie散射法、相位多普勒测速仪(PDA)和最新发展起来的颗粒跟踪测速和尺寸测量技术。(1)为消除光学背景信号，设计了层流二维逆流型喷雾燃烧器。目标是阐明喷雾火焰锋面的结构，因此火焰的稳定性是必不可少的。(2)沿燃烧器轴线测量了出现火焰结构的OH化学发光、CH带和液滴Mie散射。利用PDA对液滴的速度和直径进行了测量，得到了液滴的直径分布和数密度等数据。(4)采用激光层析成像技术和高速摄像机对液滴进行了层析成像。用粒子跟踪测速仪(PTV)测量了液滴的速度，根据Mie散射强度测量了液滴的直径。估算了许多有用的量，如数密度、蒸发率等。此外，该方法还提供了拉格朗日液滴的速度和直径历史数据。(5)利用自行研制的高空间分辨率采集光学系统MICRO，测量了液滴的OH化学发光、CH带和Mie散射强度，并同时测量了液滴的速度和直径。说明火焰锋面是一种预混燃烧现象。(6)对二维逆流喷雾火焰的结构进行了推导。