Influences of Molecular Rotation on Vibrational Kinetics and Dissociation of N2

Fujita, Kazuhisa

doi:10.2514/6.2010-1568

Cited by 2 publications

(1 citation statement)

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“…Other control temperature formulations have been suggested. 29 With accurate state-to-state rates from QCT for the O 2 -O system and rates from FHO for the O 2 -O 2 system, the best formulation can be selected. A range of translational and vibrational temperature combinations were used to determine the accurate total dissociation rate.…”

Section: B State-to-state Model (Sts)mentioning

confidence: 99%

Thermochemical Nonequilibrium Modeling for Hypersonic Flows Containing Oxygen

Neitzel

Andrienko

Boyd³

2016

46th AIAA Thermophysics Conference

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The simulation results for a set of thermochemical nonequilibrium models with a range of fidelity is compared to experimental data for shock tube and double-cone flows. The present work focuses solely on oxygen flows. The two-temperature (2T) model is the widely used approach for hypersonic analysis and is presented as the computationally efficient, lower fidelity modeling approach in this work. In contrast, the full state-to-state (STS), master equation approach is presented as the higher fidelity modeling approach. Both approaches have several available methods for obtaining rate data that are investigated. The STS method introduces a large master equation system that has been prohibitive due to its computational expensive for design applications. The present paper aims to understand the deficiencies of the standard 2T model when compared to detailed STS analysis. Additionally, the STS rates allow for detailed investigation of the effects that nonequilibrium and non-Boltzmann behavior have on the macroscopic behavior. This present work suggests a modified 2T model, the 2T-NENB (nonequilibrium, non-Boltzmann) model, that aims to capture STS model behavior in a computationally inexpensive, 2T model form. The performance of this modified model is compared with standard 2T model results, full STS model results, and experimental data. Additionally, areas of future improvement and computational expense are discussed. Nomenclature A, B Millikan-White coefficients E v Vibrational energy [J] E * v Equilibrium vibrational energy [J] K d Total dissociation rate [cm 3 /sec] k d,i Dissociation rate from ith vibrational state [cm 3 /sec] k v,v Transition rate from vibrational state v to v' [cm 3 /sec] µ Reduced mass [kg] P Pressure [atm] ρ Density [kg/m 3 ] T t Translational temperature [K] T v Vibrational temperature [K] τ v Vibrational relaxation time [sec] v Vibrational quantum state

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Section: B State-to-state Model (Sts)mentioning

confidence: 99%