Modelling of arc jet plasma flow in transitional regime by Navier Stokes and state-to-state coupling

Alexandrova, T.Yu.; Izrar, Boujema; Silva, M. Lino da; Dudeck, Michel

doi:10.1063/1.1941685

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…It is possible to consider carrying loosely-coupled calculations using a precise Navier-Stokes description of the flow macroscopic parameters, alongside a detailed description of the reactions and interactions between the flow species internal modes. Other preliminary results have already been obtained for a calculation using a loosely-coupled Navier-Stokes and state-tostate description for N 2 -O 2 flows [36], and will be extended to the description of CO 2 -N 2 flows [37].…”

Section: Discussionmentioning

confidence: 93%

Modelling of a CO2-N2 Plasma Flow in a Supersonic Arcjet Facility

Silva

Passarinho

Dudeck

2006

Journal of Thermophysics and Heat Transfer

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The Martian-type CO 2 -N 2 plasma flow obtained in the plasma generator of the SR5 arcjet facility has been simulated using two complementary fluid descriptions. An inviscid multitemperature monofluid description has firstly been used to evaluate the importance of the different chemical and exchange processes between the flow species. Then, a one-temperature Navier-Stokes description has been used to evaluate the influence of viscous and rarefaction effects. In the nozzle throat region, heat addition from the arc firstly leads to the establishment of a translation-vibration disequilibrium. Near the end of the nozzle throat, temperature and pressure increases allow more efficient exchange processes and lower this disequilibrium. In the nozzle diverging region, chemical and vibrational processes are quickly frozen as the flow strongly expands. Furthermore, a translation-rotation disequilibrium also occurs near the nozzle exit. Navier-Stokes simulation results evidence a quick increase of the diverging section boundary layers, and therefore most of the diverging section is in a fully viscous interaction regime. Moreover, rarefaction effects are predicted to appear near the nozzle exit walls. The experimental measurements carried near the nozzle exit confirm the thermal disequilibrium regime of the flow, predicted by the simulation results. Nomenclature anode = nozzle anode arc = nozzle electrical arc cathode = nozzle cathode chamber = facility vacuum chamber Da = Damköler number gas = facility gas flow generator = conditions upstream of the nozzle throat h = flow enthalpy, MJ=kg i = chemical species index Kn = Knudsen number k B = Boltzmann constant, 1:38065 10 23 J=K L = characteristic length, m M = flow Mach number _ m = mass flow, kg=s _ Q = heat transfer rate, kJ=s p = flow pressure, Pa R-T = rotation-translation processes T = flow translational temperature, K T rot = species rotational temperature, K T vib = species vibrational temperature, K T w = nozzle wall temperature, K V-D = vibration-dissociation processes V-el = vibration-electron processes V-T = vibration-translation processes V-V = vibration-vibration processes v = flow velocity, m=s ZT; T vib = nonequilibrium coupling factor for dissociation Z 1 = Parker rotational collision number E = energy transfer rate, kW = arc energy transfer efficiency = flow density, kg=m 3 = collisional cross-section, m 2 F = flow characteristic time, s vib = vibrational relaxation characteristic time, s

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Section: Discussionmentioning

confidence: 93%

Modelling of a CO2-N2 Plasma Flow in a Supersonic Arcjet Facility

Silva

Passarinho

Dudeck

2006

Journal of Thermophysics and Heat Transfer

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“…The StS model was also applied to nozzle expansion [16], including processes involving electronically excited states [17]. In the new millennium, the StS approach was used by different groups [18,19,20,21,22], but its diffusion remained limited, even if it was proved the validity of this approach. The reason of the limited use of StS model can be found in the large diffusion of multi-temperature (MT) models [23,24].…”

Section: Introductionmentioning

confidence: 99%

Problems and perspectives of state-to-state kinetics for high enthalpy plasma flows (Invited)

Colonna

2014

AIP Conference Proceedings

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State-to-state kinetic description of non-equilibrium radiative gas flow AIP Conf.Abstract. The paper will present a brief overview of the applications of state-to-state kinetics in modeling fluid dynamics. The research activities ranges from hypersonic entry (boundary layer, shock wave) to ground test facilities, from MHD interaction to DBD flow control. The state-to-state model in fluid dynamics in the last years is rapidly diffusing, promising new interesting developments in the next future.

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Modelling of an argon plasma jet generated by a dc arc

Kaminska

López

Izrar

et al. 2008

Plasma Sources Sci. Technol.

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The modelling of a dc plasma source operating at low power and at low mass flow rate is presented. The physical description of the electric arc in volume with chemical and thermal non-equilibrium conditions is given: two-temperature model, ionization-neutralization process and arc-gas interactions are discussed. The modelling assumptions are justified by the local non-dimensional numbers characterizing the system (Damkhöler, Reynolds and Knudsen numbers). Special attention is focused on the influence of the arc power on the thermal non-equilibrium between electrons and heavy particles and the resulting ionization rate. The kinetic thermal non-equilibrium is shown as a decreasing function of the arc discharge current and it is established that the electron density never reaches equilibrium conditions, even at the throat exit. Calculations have been performed for a stationary arc confined to the throat. The gas is argon and the flow is axisymmetric and stationary.

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Modelling of arc jet plasma flow in transitional regime by Navier Stokes and state-to-state coupling

Cited by 3 publications

References 2 publications

Modelling of a CO2-N2 Plasma Flow in a Supersonic Arcjet Facility

Modelling of a CO2-N2 Plasma Flow in a Supersonic Arcjet Facility

Problems and perspectives of state-to-state kinetics for high enthalpy plasma flows (Invited)

Modelling of an argon plasma jet generated by a dc arc

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