Validation of vibration-dissociation coupling models in hypersonic non-equilibrium separated flows

Shoev, Georgy; Oblapenko, Georgii; Kunova, O.; Mekhonoshina, M.; Кустова, Е. В.

doi:10.1016/j.actaastro.2017.12.023

Cited by 40 publications

(12 citation statements)

References 38 publications

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“…Both curves experience a very rapid increase until the formation of a high-value plateau after the translational temperature of 15,000 K. Such temperatures, and higher, are obtained in the modeling studies reported in [1][2][3] for the shock wave produced by hypersonic objects in the atmosphere; thus, the formation of abundant atomic hydrogen considering the high chemical rate predicted by Equation ( 17) is a real possibility in the air around hypersonic objects. In a recent paper [30], a QCT study of the reaction (18) for a wide range of temperatures (300 ≤ T/K ≤ 20,000) was presented.…”

Section: Discussionmentioning

confidence: 56%

“…A and4 A surfaces. Independently of the quantitative differences which are expected for different systems, the qualitative similarities between the rate constants are remarkable.As expected, from the rapid expansion of the gas behind the shock wave, high thermal nonequilibrium conditions in the gas layer near the moving objects are reported in the mentioned papers[1][2][3]. To make a qualitative evaluation of the effect of the disequilibrium conditions on the atomic hydrogen formation, the curves calculated considering the hypothetical hot Boltzmann distribution shifted in 5000 K (brown curve) and 10,000 K (magenta curve) are represented in Panel (b) of the Figure6.…”

mentioning

confidence: 53%

“…Local temperatures in the range of 2000 ≤ T/K ≤ 45,000 can be produced in the Earth's atmosphere by the movement of relatively large meteorites, reentry space vehicles, and hypersonic missiles and planes [1][2][3][4]. For these temperatures, there is a relatively large number of molecules populating vibrationally excited levels.…”

Section: Introductionmentioning

confidence: 99%

“…For these temperatures, there is a relatively large number of molecules populating vibrationally excited levels. Then, for such conditions, it is necessary to consider the rate constants of different reactive and nonreactive processes involving vibrationally excited species in works devoted to modeling the movement of the already-mentioned artefacts [2,3,[5][6][7]. In particular, the molecular hydrogen, a minor atmospheric constituent (0.000053 mole percent) [8][9][10], shows small reactivity for relative low translational energies.…”

Section: Introductionmentioning

confidence: 99%

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A Theoretical Study of the N2 + H2 Reactive Collisions for High Vibrational and Translational Energies

Garrido

Ballester

2021

Atmosphere

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High translational temperatures appear in the air inside the shock waves layers created by relatively large meteorites, reentry space vehicles, and hypersonic missiles. Under these conditions, reactions between molecular nitrogen and hydrogen are energetically permitted. In the present work, a quasiclassical trajectories study of the N2(v′)+H2(v″) reaction for relative translational energies covering the range of translational energy 20.0≤Etr/kcalmol−1≤120.0 is presented. In the calculations, several values of vibrational quantum numbers v′=0,4,6,8,10,12 and v″=4,6,8,10,12 have been considered. To model the interatomic interactions, a six-dimension global potential energy surface for the ground electronic state of N2H2 was used. The specific initial state reaction cross-sections and rate coefficients are reported. The energy effects produced by the reaction that could influence the shock wave modeling are here considered. An analysis of the possible impact of these processes under the atmospheric composition is also presented.

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Section: Discussionmentioning

confidence: 56%

mentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Theoretical Study of the N2 + H2 Reactive Collisions for High Vibrational and Translational Energies

Garrido

Ballester

2021

Atmosphere

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“…За последние годы было выполнено большое количество исследований взаимного влияния моделей кинетических процессов в бинарных смесях, из которых можно выделить недавние, полученные в рамках многотемпературного подхода [2,3] и с использованием ПСМ метода [4]. В данной работе моделирование эксперимента в ударной трубе осуществлялось на основе поуровневого подхода с учетом возбуждения колебательных степеней свободы.…”

Section: Introductionunclassified

Validation of Models of State-to-State Oxygen Kinetics behind Shock Waves

Kunova¹,

Kustova²,

Melnik³

et al. 2018

PhChGD

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State-to-state vibrational-chemical kinetics of a binary mixture of oxygen molecules and atoms behind the shock wave is studied. The processes of vibrational energy exchange are described on the basis of the SSH theory and the forced harmonic oscillator model (FHO). Dissociation of oxygen molecules is simulated using the generalized Treanor-Marrone model (TM) with various values of the parameter U available in the literature. All numerical results are compared with experimental data. It is found that the use of the FHO model in combination with the TM model parameter U = 3T or the modified U parameter proposed by Pogosbekian, Sergievskaya (2018) based on trajectory calculations provides satisfactory agreement when compared with the experiment under conditions with the gas temperature behind the shock front greater than 7000 K. Under conditions with the temperature less than 7000 K, the FHO model in combination with the parameter U = ∞ or the modified parameter U proposed by Savelev (2016) give the best agreement when compared with the experiments.

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Uncertainty Quantification of Expanding High-Enthalpy Air Flows

Oblapenko,

Hannemann

2023

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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In the present work, we study the sensitivity of expanding hypersonic air flows in the HEG facility with respect to the thermochemical relaxation rates and reservoir conditions, along with the impact of uncertainties in the rates and reservoir conditions on uncertainties of the free-stream parameters. A simplified 1-D formulation of the flow equations is utilized to allow for simultaneous variation of a large number (10) of uncertain parameters. The simulation results show large uncertainties in the vibrational temperature of oxygen and molar fractions of oxygen-containing species, mainly due to uncertainties in the reservoir parameters and data on thermochemical relaxation rates of molecular oxygen.

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Validation of vibration-dissociation coupling models in hypersonic non-equilibrium separated flows

Cited by 40 publications

References 38 publications

A Theoretical Study of the N2 + H2 Reactive Collisions for High Vibrational and Translational Energies

A Theoretical Study of the N2 + H2 Reactive Collisions for High Vibrational and Translational Energies

Validation of Models of State-to-State Oxygen Kinetics behind Shock Waves

Uncertainty Quantification of Expanding High-Enthalpy Air Flows

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