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Optical Analysis of Rarefied Gas Mixture Flow Using a Laser

使用激光对稀薄气体混合物流进行光学分析

基本信息

批准号：
62420026
负责人：
FUJIMOTO Tetsuo
金额：
$ 22.85万
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 (A)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1990
项目状态：
已结题

项目摘要

The Q-branch broadband CARS is applied to measurement of temperature in reduced pressure DC plasma jets of pure nitrogen. In calculation of theoretical CARS profiles, only Doppler broadening is taken into account as a broadening parameter, neglecting pressure broadening because of low pressure (6 Torr). A plasma generator with a water-cooled nozzle produces a relatively low temperature plasma jet. Hotband can not be observed in the CARS spectra. Temperature in the plasma jet increases downstream along the centerline due to formation of the weak shock wave. And temperature rises over the entire flow field with discharge current.A method for planar measurement of temperature in a compressible flow by means of two-line laser-induced iodine fluorescence is proposed. Temperature is determined from the ratio of the intensities of fluorescence, which are obtained by irradiation of two laser beams of different wavelength. Use of of a high-sensitivity vidicom camera permits multiple-point measurements of temperature in the flow field. This method is applied to a supersonic free jet. It is found that the results obtained by P(16)/R(18) and P(26)/R(28) absorption lines in the transition of B<-X can predict temperature below 300 K with an accuracy of <plus-minus> 5Mass separation in the interacting region of opposed two-dimensional supersonic free jets of argon-helium mixture is investigated by use of the DSMC method. The mixing ratio of argon and helium is assumed to be 1 : 9. Spatial distributions of argon and helium number densities and argon molar fraction are obtained for the upstream inverse Knudsen numbers, 1/Kn, in the range of 0.616 to 61.2. Outward flow from the stagnant region is collected by a skimmer, which has the same width as the slit, D, and is located at a distance 2D from the slit centerline. For these conditions, argon is enriched effectively and the optimum separation effect is observed at about 1/Kn=25.

将Q分支宽带汽车应用于纯氮减压直流等离子体射流温度的测量。在理论汽车轮廓的计算中，仅考虑多普勒展宽作为展宽参数，忽略压力展宽，因为低压力（6 Torr）。具有水冷喷嘴的等离子体发生器产生相对低温的等离子体射流。在汽车谱中没有观察到热带。由于弱激波的形成，等离子体射流中的温度沿中心线向下游沿着增加。提出了一种利用双谱线激光诱导碘荧光测量可压缩流场温度的平面测量方法。温度由荧光强度之比确定，荧光强度是通过照射两束不同波长的激光束获得的。使用高灵敏度的摄像机允许多点测量流场中的温度。将该方法应用于超声速自由射流。结果表明，P（16）/R（18）和P（26）/R（28）吸收线在B<-X跃迁时的结果可以预测300 K以下的温度，精度为<plus-minus>5质量分离。氩和氦的混合比假定为1：9。氩和氦的数密度和氩的摩尔分数的空间分布获得的上游逆克努森数，1/Kn，在0.616至61.2的范围内。来自停滞区域的溢流由撇渣器收集，撇渣器具有与狭缝相同的宽度D，并且位于距狭缝中心线2D的距离处。在这些条件下，氩被有效地富集，并且在约1/Kn=25时观察到最佳分离效果。