Analysis of VUV radiation measurements from high temperature air mixtures

Lemal, Adrien; Nishimura, Sayaka; Nomura, Satoshi; Takayanagi, Hideaki; Matsuyama, Shingo; Fujita, Kazuhisa

doi:10.2514/6.2016-0740

Cited by 5 publications

(9 citation statements)

References 6 publications

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“…The electronic temperature is approximately 6,200 K, and the lower electronic temperature compared to the equilibrium temperature is consistent with the phenomena in Ref. 3). Lemal et al 3) estimated electronic temperature from VUV emission spectra to be 20% lower than the equilibrium temperature.…”

Section: Hvst Shock Tube Flows (U S =118 Km/s)supporting

confidence: 89%

“…The definition of shock position is obtained as follows. The normalized pressure is (3) The shock position is defined as the position where the normalized pressure is equal to 0.5.…”

Section: Numerical Modelingmentioning

confidence: 99%

“…3). Lemal et al 3) estimated electronic temperature from VUV emission spectra to be 20% lower than the equilibrium temperature. This feature is attributed to the strong depletion of the electronic states by electron impact processes.…”

Section: Hvst Shock Tube Flows (U S =118 Km/s)mentioning

confidence: 99%

“…measurements in VUV wavelength region behind strong shock wave with a speed between 11 and 14.5 km/s, and estimated flow conditions in the post-shock region. Lemal et al 3) have analyzed VUV spectra and observed strong non-equilibrium phenomena in the post-shock region. Lately, Nomura et al 4) have measured electron number density distributions by using a triple probe system.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Ionization and Electronic Excitationin Hypersonic Shock Tube Flows Using DSMC

Ozawa¹,

Nomura²,

Kawakami

et al. 2018

AEROSPACE TECHNOLOGY JAPAN

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Section: Hvst Shock Tube Flows (U S =118 Km/s)supporting

confidence: 89%

“…The definition of shock position is obtained as follows. The normalized pressure is (3) The shock position is defined as the position where the normalized pressure is equal to 0.5.…”

Section: Numerical Modelingmentioning

confidence: 99%

Section: Hvst Shock Tube Flows (U S =118 Km/s)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Simulation of Ionization and Electronic Excitationin Hypersonic Shock Tube Flows Using DSMC

Ozawa¹,

Nomura²,

Kawakami

et al. 2018

AEROSPACE TECHNOLOGY JAPAN

Self Cite

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“…While the N 149 nm line is close to predictions, the N 174nm line is significantly higher. The unmatched ratio of these two lines has been observed by other authors [18,19]. Here, a simultaneous fit of these lines is performed and overlaid on the figure.…”

Section: A Vacuum Ultraviolet Spectrumsupporting

confidence: 61%

Analysis of Shockwave Radiation Data in Nitrogen

Cruden

Brandis

2019

AIAA Aviation 2019 Forum

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Data from test series in the Electric Arc Shock Tube Facility were previously reported for velocities spanning 6-12 km/s in pure N2 at a freestream pressure of 0.2 Torr. The test series provided spectrally-and spatially-resolved data for validation of a number of models of physical phenomena, including vibrational relaxation, molecular radiation, nitrogen dissociation and ionization, and atomic radiation and ionization. In the present work analysis of data obtained at a nominal velocity of 10.3 km/s is discussed in detail. Spectra are analyzed to extract temperatures and the densities of excited states as a function of position behind the shock. The effect of different methods for calculating state populations and ionization processes is assessed, as is a rigorous assessment of the atomic line lists, with both missing and extra lines identified.

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