权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Instrumentation Development of Compact Laser Diagnostic Systems for the Combustion Experiments under Microgravity

微重力燃烧实验紧凑型激光诊断系统的仪器开发

基本信息

批准号：
08555241
负责人：
KADOTA Toshikazu
金额：
$ 12.16万
依托单位：
Osaka Prefecture University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
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-08555241/
关键词：
Microgravity Combustion Laser Measurement Laser induced fluorescence Laser light scattering Droplet temperature Soot レーザ散乱法

项目摘要

The instrumentation development has been made of compact laser-based diagnostic systems which is applicable for the experimental study of the combustion processes under microgravity.A small drop shaft was newly developed which enabled the combustion experiments under microgravity during the period of time 0.8 s. The structure of the spherical flame and the soot shell were observed by using shadowgraph. Planar laser light scattering was applied for the visualization of two dimensional soot concentration profile in the droplet flame. A droplet burning in quiescent gaseous environment was irradiated with the sheet of an incident cw Argon laser or a pulsed YAG laser and the image of the scattered light intensity was detected with the use of a CCD camera via a band pass filter.OH concentration profile in the droplet flame was measured by using planar laser induced fluorescence. A sheet of an incident dye laser pumped with the second harmonic of a pulsed YAG laser was utilized as a light source and the fluorescence intensity was transmitted through a band pass filter, being detected by using a CCD camera with a gated image intensifier which was installed at the right angle to the incident laser light. This resulted in the successful visualization of two dimensional profile of OH concentration in the droplet flame.Laser induced fluorescence was applied for the remote probing of the temperature of the droplet surrounded by an envelope flame. A fuel droplet doped with a small amount of naphthalene and TMPD was subjected to the irradiation of the incident nitrogen laser. Resultant fluorescence intensity was detected by using an optical multichannel analyzer and the droplet fluorescing blue was photographed by a CCD camera. The droplet temperature was determined by measuring the ratio of the fluorescence intensities at two different wavelengths.

研制了适用于微重力条件下燃烧过程实验研究的小型激光诊断系统，并研制了一个小落轴，可在0.8 s内进行微重力条件下的燃烧实验。用阴影法观察了球形火焰和碳烟壳的结构。应用平面激光光散射技术对液滴火焰中碳烟浓度的二维分布进行了可视化研究。用连续氩激光或脉冲YAG激光照射静止气体环境中燃烧的液滴，通过带通滤光片用CCD摄像机检测其散射光强图像，用平面激光诱导荧光法测量液滴火焰中OH浓度分布。利用脉冲YAG激光器的第二谐波泵浦的入射染料激光器的片作为光源，并且荧光强度通过带通滤波器透射，通过使用具有选通图像增强器的CCD相机检测，该选通图像增强器安装在与入射激光成直角的位置。采用激光诱导荧光技术对火焰中的液滴温度进行了遥测，并对液滴温度进行了测量。用氮激光对掺有少量萘和TMPD的燃料液滴进行了辐照。通过使用光学多通道分析仪检测所得荧光强度，并通过CCD相机拍摄发蓝色荧光的液滴。通过测量两个不同波长处的荧光强度的比率来确定液滴温度。