Spectroscopic Analysis of Titan Atmospheric Plasmas

Playez, M.; Fletcher, Douglas G.

doi:10.2514/1.30442

Cited by 4 publications

(2 citation statements)

References 27 publications

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“…It has also been predicted that, below an entry speed of about 7 km/s, nearly all of the radiative heating is due to the CN violet (B 2 Σ + → X 2 Σ + ) and red (A 2 Π → X 2 Σ + ) bands [3]. An accurate estimate of this radiative heat flux is therefore necessary for a proper design of the thermal protection system (TPS) [4][5][6][7][8]. Moreover, the radiation emission is strongly dependent on the non-equilibrium conditions present behind the shock wave, which requires implementation of thermochemical models for accurate prediction of the emitted radiation.…”

Section: Introductionmentioning

confidence: 99%

Measurements of non-equilibrium and equilibrium temperature behind a strong shock wave in simulated martian atmosphere

Lin

et al. 2012

Acta Mech Sin

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Non-equilibrium radiation measurements behind strong shock wave for simulated Martian atmosphere are presented in this paper. The shock wave is established in a hydrogen oxygen combustion driven shock tube. Timeresolved spectra of the Δv = 0 sequence of the B 2 Σ + → X 2 Σ + electronic transition of CN have been observed through optical emission spectroscopy (OES). A new method, which is based on fitting high resolution spectrum for rotational and vibrational temperatures measurement, is proposed to diagnose temperature distribution behind the shock wave. It is estimated that the current scheme has the maximum deviation less than 8% (1σ) for vibrational temperature measurement through detailed analysis of the influence of the uncertainties of spectroscopic constants and spectral resolution. Radiation structure of the shock layer, including induction, relaxation and equilibrium process, and corresponding rotational and vibrational temperatures are obtained through time gating OES diagnostics with sub-microsecond temporal resolution. The present extensive results will strongly benefit the reaction rate estimation and computational fluid dynamics (CFD) code validation in high enthalpy Mars reentry chemistry.

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Section: Introductionmentioning

confidence: 99%

Measurements of non-equilibrium and equilibrium temperature behind a strong shock wave in simulated martian atmosphere

Lin

et al. 2012

Acta Mech Sin

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“…A comparison of our rotational and vibrational temperatures for the CN violet system with those obtained by Labracherie [12] in a free piston wind tunnel and reflected shock has been made and shows good agreement for the rotational temperature. Emission spectroscopy measurements carried out at the VKI (Von kàrmàn Institute) Minitorch facility, which is an inductively coupled plasma (ICP) wind tunnel, have recently been presented by Playez and Fletcher [13] for the spectroscopic analysis of Titan atmospheric plasmas. Unfortunately, they did not explore the CH and NH spectra for comparison purposes.…”

Section: Introductionmentioning

confidence: 99%

Optical spectroscopy investigation of N₂–CH₄plasma jets simulating Titan atmospheric entry conditions

Ndiaye¹,

Lago²

2011

Plasma Sources Sci. Technol.

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Planetary probes penetrating at supersonic speed into high atmosphere require the development of composite materials for thermal protection of the surface exposed to a high enthalpy flux. Rarefied arc plasmas can be used to simulate the atmospheric re-entry plasmas. The aim of this paper is to describe the latest results of optical emission measurements of the CH (A-X) system, the CN violet (B-X) bands and the NH (A-X) electronic transitions in a N 2 -CH 4 plasma source (Titan's atmosphere) and in a gas mixture of Ar-CH 4 . In order to deduce the plasma parameters, such as rotational and vibrational temperatures, of these molecular species in the plasma environment, numerical simulation codes have been implemented. In this context, rotational temperatures near 7000 K for CN and 3500 K to 2800 K for the hydrides NH and CH, respectively, are observed. The vibrational temperature of the CH molecule is around 3800 K while those of the CN and NH molecules are 9500 K and 7900 K, respectively.

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Review of the VKI research on nonequilibrium phenomena in hypersonics

Magin

Chazot

2012

50th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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Spectroscopic Analysis of Titan Atmospheric Plasmas

Cited by 4 publications

References 27 publications

Measurements of non-equilibrium and equilibrium temperature behind a strong shock wave in simulated martian atmosphere

Measurements of non-equilibrium and equilibrium temperature behind a strong shock wave in simulated martian atmosphere

Optical spectroscopy investigation of N₂–CH₄plasma jets simulating Titan atmospheric entry conditions

Review of the VKI research on nonequilibrium phenomena in hypersonics

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Spectroscopic Analysis of Titan Atmospheric Plasmas

Cited by 4 publications

References 27 publications

Measurements of non-equilibrium and equilibrium temperature behind a strong shock wave in simulated martian atmosphere

Measurements of non-equilibrium and equilibrium temperature behind a strong shock wave in simulated martian atmosphere

Optical spectroscopy investigation of N2–CH4plasma jets simulating Titan atmospheric entry conditions

Review of the VKI research on nonequilibrium phenomena in hypersonics

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Optical spectroscopy investigation of N₂–CH₄plasma jets simulating Titan atmospheric entry conditions