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Development of the Diode-Laser Absorption Spectroscopy System for the Diagnostics of High-Temperature Flows.

用于高温流诊断的二极管激光吸收光谱系统的开发。

基本信息

批准号：
10555334
负责人：
ARAKAWA Yoshihiro
金额：
$ 8.51万
依托单位：
The university of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

In this academic year, we conducted spectroscopic measurements on high-enthalpy plumes generated in the wind tunnels at the university of Tokyo, Nagoya university, the Japan ultra-high temperature material research center (Nagoya), the national aerospace laboratory (Chofu), and the university of Stuttgart (Germany). The results are summarized as follows.1) Three-dimensional determination of arcjet argon-plume properties was achieved by computer tomographic reconstruction.2) In order to get the information of high-temperature air plume, we accessed to the atomic oxygen absorption line at the wavelength of 777.19 nm and successfully measured the translational temperature and the number density of excited atomic oxygen. From the measured three-dimension distribution, the diffusive mixing process of oxygen gas into nitrogen gas was clarified, and owing to this process, the degree of dissociation in the plume generated by constrictor-type arc-wind tunnels was found lower than the expected value.3) In the repetitively discharging inductive-heating wind tunnel, we succeeded in measuring the profiles of temperature and number density of atomic oxygen in high-temperature pure-oxygen flows.4) Diagnosis of the optically thick plumes, which is quite difficult for the Laser Induced Florescence or Emission Spectroscopy measurements, has been successfully done using Laser absorption spectroscopy. (The maximum absorption reached at 97%)5) The portability and wide-usage of our laser diagnostic system has been demonstrated by transporting and applying it to the wind tunnels located at Nagoya, Tokyo and Stuttgart, Germany.6) For the future improvement of system performance and for the measurement of ground level number density, the increase in its sensitivity by several orders of magnitude would be essential.

在本学年中，我们对东京大学、名古屋大学、日本超高温材料研究中心（名古屋）、国家航空航天实验室（乔夫）和斯图加特大学（德国）风洞中产生的高焓羽流进行了光谱测量。主要研究结果如下：1）利用计算机层析重建技术实现了电弧加热氩气羽流特性的三维测量; 2）为了获得高温空气羽流的信息，我们利用原子氧在777.19 nm波长处的吸收谱线，成功地测量了高温空气羽流的平动温度和激发态原子氧的数密度。从测量的三维分布可以清楚地看出，在压缩型电弧风洞中，由于氧气与氮气的扩散混合，产生的羽流的离解度低于预期值。3）在重复放电感应加热风洞中，我们成功地测量了高温纯氧流中原子氧的温度和数密度分布。4）光学厚羽流的诊断，这对于激光诱导荧光或发射光谱测量是相当困难的，已经使用激光吸收光谱成功地完成。(The最大吸收率达到97%）5）我们的激光诊断系统的便携性和广泛用途已经通过将其运输和应用于位于名古屋、东京和德国斯图加特的风洞而得到证明。6）为了将来改进系统性能和测量地面数密度，将其灵敏度提高几个数量级是必不可少的。