2024-03-29T15:41:02Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00007336
2023-01-16T03:52:52Z
320:321:322
Experimental Analysis of Non-Boltzmann Rotational Energy Distribution in Supersonic Free Molecular Flows
超音速自由分子流における非ボルツマン回転エネルギー分布の実験的解析
森, 英男
20273
MORI, Hideo
20274
新美, 智秀
20275
NIIMI, Tomohide
20276
秋山, 勇雄
20277
AKIYAMA, Isao
20278
都築, 巧
20279
TSUZUKI, Takumi
20280
Non-equilibrium flow
Rarefied Gas
Molecular Flow
Flow Measurements
REMPI
Boltzmann Plot
Rotational Energy Distribution
In the present study, we measure the rotational population in supersonic nitrogen free jets using a REMPI (resonantly enhanced multi-photon ionization) method, which is not influenced by secondary electrons, unlike an electron beam method. Nitrogen ions are detected as a REMPI signal and its spectra depending on the wavelength of an irradiated laser beam are analyzed to measure rotational temperature through the Boltzmann plot. Nitrogen gas expands into a vacuum chamber from a sonic nozzle with a D=0.50 mm diameter, setting PoD (Po:source pressure), depending inversely on the nozzle Knudsen number, at 15 Torr・mm or lower. For PoD=15 Torr・mm, the rotational temperature distribution along the centerline of the jet, measured by Boltzmann plot, coincides with Marrone's data measured by electron beam fluorescence, and the rotational relaxation rate Z_R calculated by the relaxation equation results is 1.3. However, the non-Boltzmann rotational distribution appears evidently in the supersonic free molecular nitrogen flows for PoD≤15 Torr・mm and as a decrease in the PoD, the deviation from the Boltzmann distribution and the partial freezing of the population arise more upstream.
journal article
日本機械学会
2005-02
application/pdf
日本機械学會論文集 B編
702
71
436
441
http://hdl.handle.net/2237/9017
0387-5016
https://nagoya.repo.nii.ac.jp/record/7336/files/JsMecEngB_71-702-436.pdf
jpn
http://ci.nii.ac.jp/naid/110005051421/
日本機械学会
本文データは学協会の許諾に基づきCiNiiから複製したものである。