Measurement of the vibrational temperature of oxygen behind a shock wave front under thermal and chemical nonequilibrium conditions

Забелинский, И. Е.; Ibraguimova, L. B.; Shatalov, O. P.

doi:10.1134/s0015462810030154

Cited by 15 publications

(2 citation statements)

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“…At low kinetic temperatures, the population of rovibrational states converges to equilibrium significantly faster than the dissociation process takes place [3,37]. At higher temperatures, dissociation and thermal relaxation occur within the same timescale, and these processes have to be studied in a coupled manner.…”

Section: B Master Equationsmentioning

confidence: 99%

Master Equation Study of Vibrational and Rotational Relaxations of Oxygen

Andrienko

Boyd

2016

Journal of Thermophysics and Heat Transfer

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Transition rates in O 2 -O collisions for each vibrational and rovibrational state are generated by means of the quasiclassical trajectory method using potential energy surfaces of different fidelities. The first potential energy surface, obtained via the double many-body expansion method, is adopted to obtain vibrational transition rates assuming transrotational equilibrium. The trajectory simulation on a simpler potential surface, based on the two-body pairwise interaction, generates a complete set of rates for each internal state. Vibrational and rotational relaxations of oxygen in a heat bath of parent atoms are modeled by a system of master equations at translational temperatures between 1000 and 20,000 K. It is shown that the vibrational relaxation becomes less efficient at high temperatures, in contrast with the conventional equation for relaxation time proposed by Millikan and White ("Systematics of Vibrational , Paper 3209). Rotational and vibrational relaxation times are the same order of magnitude in the range of temperatures observed in hypersonic flows. The excitation of the vibrational mode in O 2 -O collisions under typical postshock conditions occurs earlier than in other molecular systems. The exchange channel plays an important role in the internal energy randomization.

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Section: B Master Equationsmentioning

confidence: 99%

Master Equation Study of Vibrational and Rotational Relaxations of Oxygen

Andrienko

Boyd

2016

Journal of Thermophysics and Heat Transfer

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“…The equations of conservation of mass (1), (2), momentum (3), and translational-rotational energy (4) are solved by the main solver, and the equation of relaxation of vibrational energy (5) of polyatomic components of the gas mixture is added by using the option T a b l e 2 Parameters of chemical reactions[24,25] …”

mentioning

confidence: 99%

Development and testing of a numerical simulation method for thermally nonequilibrium dissociating flows in ANSYS Fluent

Shoev

Bondar

Oblapenko

et al. 2016

Thermophys. Aeromech.

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Various issues of numerical simulation of supersonic gas flows with allowance for thermochemical nonequilibrium on the basis of fluid dynamic equations in the two-temperature approximation are discussed. The computational tool for modeling flows with thermochemical nonequilibrium is the commercial software package ANSYS Fluent with an additional userdefined open-code module. A comparative analysis of results obtained by various models of vibration-dissociation coupling in binary gas mixtures of nitrogen and oxygen is performed. Results of numerical simulations are compared with available experimental data.

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Non-equilibrium Kinetics behind Shock Waves Experimental Aspects

Ibraguimova

Shatalov

2012

High Temperature Phenomena in Shock Waves

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Measurement of the vibrational temperature of oxygen behind a shock wave front under thermal and chemical nonequilibrium conditions

Cited by 15 publications

References 1 publication

Master Equation Study of Vibrational and Rotational Relaxations of Oxygen

Master Equation Study of Vibrational and Rotational Relaxations of Oxygen

Development and testing of a numerical simulation method for thermally nonequilibrium dissociating flows in ANSYS Fluent

Non-equilibrium Kinetics behind Shock Waves Experimental Aspects

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