Vibrational relaxation measurements in an expanding flow using spontaneous Raman scattering

Sharma, Surendra P.; Ruffin, Stephen M.; Gillespie, Walter D.; Meyer, Scott A.

doi:10.2514/3.479

Cited by 74 publications

(20 citation statements)

References 9 publications

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“…Details about the used thermochemical models and numerical method can be found in [16]. The numerical prediction aims at reproducing one of the experiments conducted in the NASA Ames EAST facility nozzle by Sharma, et al [17,18]. The working gas is pure nitrogen and the stagnation conditions for the considered experiment are defined in Table 3, which correspond to case B of reference [19].…”

Section: State-to-state Computationsmentioning

confidence: 99%

Different Approximation Levels in Using CFD for the Design of Hypersonic Vehicles

Schettino¹,

D’Ambrosio²

2014

TOPPJ

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Abstract:In this paper the importance of using accurate CFD simulations in the design of hypersonic vehicles is stressed. The attention is focused on the one hand on the need to providing the vehicle designer with the estimated error bars together with the nominal values of the design parameters. On the other hand it is underlined how, in the different design phases, different levels of accuracy can be used, from simple inviscid computations to complex viscous non-equilibrium modellization, depending on the problem that must be solved. Then, the attention is focused on the kinetic models, from the classic macroscopic to the advanced models based on the state-to-state approach. Some examples of test cases that were used in the last years to validate CFD codes with respect to the kinetic modeling are presented, with the aim of emphasizing the potential advantages in using the state-to-state approach. Finally, preliminary results of the numerical rebuilding of wind tunnel test cases that are currently being performed in the framework of the Phys4Entry Project for code validation are shown.

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Section: State-to-state Computationsmentioning

confidence: 99%

Different Approximation Levels in Using CFD for the Design of Hypersonic Vehicles

Schettino¹,

D’Ambrosio²

2014

TOPPJ

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“…The method has been used to study the vibrational relaxation of nitrogen in a converging-diverging nozzle of the NASA Ames Research Center Electric Arc-Driven Shock Tube (EAST) Facility [14].…”

Section: Introductionmentioning

confidence: 99%

3D nozzle flow simulations including state-to-state kinetics calculation

Cutrone

Tuttafesta

Capitelli

et al. 2014

AIP Conference Proceedings

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In supersonic and hypersonic flows, thermal and chemical non-equilibrium is one of the fundamental aspects that must be taken into account for the accurate characterization of the plasma. In this paper, we present an optimized methodology to approach plasma numerical simulation by state-to-state kinetics calculations in a fully 3D Navier-Stokes CFD solver. Numerical simulations of an expanding flow are presented aimed at comparing the behavior of state-to-state chemical kinetics models with respect to the macroscopic thermochemical non-equilibrium models that are usually used in the numerical computation of high temperature hypersonic flows. The comparison is focused both on the differences in the numerical results and on the computational effort associated with each approach.

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“…34,35 The stagnation conditions for the considered experiment are defined in Table 7. It corresponds to case B of Ref.…”

Section: Va Considered Test Casesmentioning

confidence: 99%

Consistent Comparison of Macroscopic and State-to-State Kinetics in Hypersonic Flows

Colonna¹,

D’Ambrosio

Capitelli

2007

39th AIAA Thermophysics Conference

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We present a comparison of numerical results in strongly expanding hypersonic flows that have been obtained using state-to-state and macroscopic thermochemical models. The macroscopic model, which includes direct cross coupling between chemical and vibrational relaxation, has been derived directly from the state-to-state kinetic rates. This makes the comparison the most consistent possible, as differences cannot be ascribed to original discrepancies in the used rates. The comparison is conducted in a N2-N system using the test conditions of the EAST facility nozzle experiment, for which experimental data are available. Nomenclature

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Vibrational relaxation measurements in an expanding flow using spontaneous Raman scattering

Cited by 74 publications

References 9 publications

Different Approximation Levels in Using CFD for the Design of Hypersonic Vehicles

Different Approximation Levels in Using CFD for the Design of Hypersonic Vehicles

3D nozzle flow simulations including state-to-state kinetics calculation

Consistent Comparison of Macroscopic and State-to-State Kinetics in Hypersonic Flows

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