Flow Properties of a Partially Ionized Free Jet Expansion

Fraser, R

doi:10.1063/1.1693336

Cited by 38 publications

(10 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electron density also decreases with the square of the axial coordinate. [5][6][7][8][9][10][11][12][13][14][15] In Fig. 4 the experimental values and the modeling results show the same decrease.…”

Section: ͑21͒mentioning

confidence: 54%

Plasma expansion in the preshock region

Burm

Goedheer

Schram

2001

Journal of Applied Physics

View full text Add to dashboard Cite

The supersonic expansion of an underexpanding argon plasma from a high density arc source with small dimensions into a low-pressure vessel with large dimensions is studied by an extended one-dimensional nonlocal thermal equilibrium fluid model, called SPIRIT. In an expanding plasma the velocity increases and the pressure, the density, and the temperatures decrease severely. In this article the virtual source model is discussed first, which is a model describing the expanding plasma as originating from a virtual source. The virtual source model includes some viscosity and heat transport in simplified form, but most of the viscosity and heat transport contributions are neglected. The SPIRIT code includes the full energy and momentum balances. The inclusion of viscosity and heat sources may lead to deviations from an adiabatic and/or isentropic expansion. The SPIRIT code can analyze the deviations. When deviations are small, the isentropic expressions from gas dynamics can be used to model expanding plasma too. Model outcomes are compared with experimental data.

show abstract

Section: ͑21͒mentioning

confidence: 54%

Plasma expansion in the preshock region

Burm

Goedheer

Schram

2001

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…It should be noted that no systematic studies of the gasdynamic structure of rarefied high-temperature jets have been performed at all. At present there are only single papers 15,16 containing data on the measurement of the total pressure and density in individual modes of flow, and studies of the physical processes in gas streams expanding from a plasma source have been conducted without the necessary attention to the gasdynamic structure of the jets.…”

Section: Gasdynamic Structure Of Low-density Plasma Jetsmentioning

confidence: 98%

“…Under typical conditions with the use of plasma heaters the degree of ionisation is small as a rule and does not exceed 1%. 16 The recombination coefficient is on the order of 10 -10 12 cm /s 21,22 and the relaxation rate is low. 23 This gives reason to assume that the ionisation in the jet is practically "frozen-in" and, consequently, the adiabatic index along a streamline corresponds to a monatomic gas.…”

mentioning

confidence: 99%

<title>Measurement of the local density in rarefied flows by means of characteristic fluorescence</title>

Kuznetsov

Yarygin

1997

SPIE Proceedings

View full text Add to dashboard Cite

The new method is based on the interaction of fast beam electrons with electrons in the outer shells of atoms, which generates the characteristic X-ray radiation. The intensity of X-rays is proportional to the concentration of the atoms in investigated gas.The gasdynamic structures of rarefied argon jets were studied in the range of stagnation temperatures up to 5200 K using the this X-ray method. The experimental studies of the present work were performed in a low-density gasdynamic chamber. The arc heater was used as a gasdynamic source. The changes in the structure of a jet of monatomic gas beyond a sonic nozzle with variation in the rarefaction and the temperature factor have been clarified as a result of the experiments and generalisations performed.

show abstract

“…The stagnation temperature was calculated by using the simple choked flow relationship as given in [6]. Under our flow conditions, the Mach number was 4.0 at the nozzle exit and 4.4 at the blunt body position.…”

Section: Methodsmentioning

confidence: 99%

Spectroscopic Studies of the Dark Space ahead of a Shock Wave in an Argon Plasma Flow

Nishida

Nakajima

1983

Zeitschrift Für Naturforschung A

View full text Add to dashboard Cite

Spectroscopic studies of the dark space ahead of a detached shock wave caused by a blunt body were made in a partially ionized argon flow. From emission measurements, spatially resolved population densities of states 5p[3/2], 5p[5/2] and 4p[3/2] were determined at 20 stations in the flow, for both cases when the blunt body is placed in the flow and when it is withdrawn. The result shows that the population densities of the above mentioned states ahead of the shock wave are reduced when the body is placed in the flow. A prediction was obtained by assuming a steady state population for all levels higher than level 4 s. In the prediction the measured electron temperatures and densities were employed to determine collisional transition probabilities. From a comparison of the experiment with the prediction, it is considered that the dark space is caused by the elevation in the electron temperature ahead of the shock wave.

show abstract

Flow Properties of a Partially Ionized Free Jet Expansion

Cited by 38 publications

References 22 publications

Plasma expansion in the preshock region

Plasma expansion in the preshock region

<title>Measurement of the local density in rarefied flows by means of characteristic fluorescence</title>

Spectroscopic Studies of the Dark Space ahead of a Shock Wave in an Argon Plasma Flow

Contact Info

Product

Resources

About