Modelling of the Arc-Jet Plasma Flow in the SR5 Nozzle Using a Thermochemical Nonequilibrium and a State-to-State Approach

Silva, M. Lino da; Passarinho, F.; Alexandrova, T.Yu.; Dudeck, Michel

doi:10.1063/1.1941695

Cited by 2 publications

(1 citation statement)

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“…[70] for a converging-diverging nozzle with conditions representative of those in reflected shock tunnels, and that reported by Ref. [76] for a converging-diverging nozzle with a condition representative of those in arc-jets.…”

Section: B Reducing Vvt Transitions To Vt Transitionssupporting

confidence: 55%

State-Specific Study of Air in the Expansion Tunnel Nozzle and Test Section

Hao

Wen

2022

AIAA Journal

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Thermochemical nonequilibrium in expansion tunnel nozzles is investigated numerically using a state-to-state description in one-dimension for representative air conditions. Limiting the multi-quantum jumps of VVT transitions to 3 in both N2 and O2 can accurately simulate the nonequilibrium nozzle flow. The reduction of VVT transitions to VT transitions works well. State-to-state modelling of an actual expansion tunnel nozzle condition yielded agreement with the measured static pressure. A study on the influence of different thermochemical excitation in the freestream at the test section shows that the post-shock radiation emissions can differ by more than 50 %. However, the non-Boltzmann distributions in the freestream has no influence. An evaluation of the discrepancy between the twotemperature and state-to-state models shows that the former generally predicts a faster thermochemical relaxation. Furthermore, the state-to-state results indicate that, in general, the molecular species all have a different vibrational temperature.

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Section: B Reducing Vvt Transitions To Vt Transitionssupporting

confidence: 55%