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

Visualization and Measuement of Rarefied Gas Flow using LIUFV

使用 LIUFV 可视化和测量稀薄气流

基本信息

批准号：
03452122
负责人：
FUJIMOTO Tetsuo
金额：
$ 4.61万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03452122/
关键词：
LIUVF Oxygen Molecule Temperature Measurement Two-dimensional Measurement Visualized Image Rarefied Gas Flow Laser Sheet Picture Processing LIF ヨウ素高感度CCDカメラレ-ザシ-ト

项目摘要

Flow field of rarefied gas flow can be visualized by LIUVF(Laser-Induced Ultra Violet Fluorescence) of oxygen molecules using an image intensifier and a CCD camera. ArF excimer laser at 193 nm corresponds to the Schumen -Runge X*B system of transitions. Oxygen molecules radiate the UV fluorescence by irradiation of this laser beam. The LIUVF method is applied to the flow visualization of the rarefied gas flow; a supersonic free jet. Because of weakness of the fluorescence, however, an image of the flow field can not be obtained less clearly using the fluorescence of oxygen molecules than that of iodine molecules. For temperature measurement of the rarefied gas flow, the results also indicates low accuracy. We believe that it is necessary to improve a detection system of the fluorescence.Flow visualization and temperature measurement of the rarefied gas flow using laser-induced iodine fluorescence is also carried out. The flow visualization is applied to an analysis of the flow field structure of the opposed supersonic free jets. Characteristic structures of the flow field and an unstable flow in the interacting region is found. For temperature measurement, two lines PLIF method is developed. A method for selection of optimum combination of a two absorption lines is proposed theoretically and the propriety and effectiveness is verified by experiments

利用氧分子的激光诱导紫外荧光（LIUVF）技术，利用像增强器和CCD摄像机，可以实现稀薄气体流场的可视化。193 nm的ArF准分子激光对应于Schumen-Runge X*B跃迁系统.通过照射该激光束，氧分子发射UV荧光。本文将LIUVF方法应用于稀薄气体超声速自由射流的流动显示。然而，由于荧光的弱，使用氧分子的荧光不能获得比碘分子的荧光更不清晰的流场图像。对于稀薄气体流的温度测量，结果也表明精度较低。我们认为有必要改进荧光探测系统，并利用激光诱导碘荧光对稀薄气体流场进行了流动显示和温度测量。应用流动显示技术对超声速自由射流的流场结构进行了分析。发现了流场的特征结构和干扰区的不稳定流动，发展了双线PLIF测温方法。从理论上提出了一种选择两条吸收线最佳组合的方法，并通过实验验证了其正确性和有效性