Modeling of NO radiation from unsteady and steady shocks using DSMC

Tong Zhu, Zheng Li, Deborah Levin Fliflet

Research output: Contribution to conferencePaper

Abstract

Radiation of the NO gamma band emitted from nonequilibrium hypersonic bow shock flows in air has been studied for both unsteady one-dimensional reflected shock and steady flow over a cylinder cases and compared with experiments. The Larsen-Borgnakke model was used for internal energy relaxation and the total collision energy model is used with five chemical species (N2, O2, N, O and NO). The quasi-steady state (QSS) assumption was used in calculating the neutral-impact excitation of NO and the associated radiation. The calculated radiations are in good agreement with the experimental data of Gorelov for shock speeds below 7 km/s in the unsteady shock study. The calculated radiation is lower than the experimental data for even higher shock speeds. For the steady flow over a cylinder simulation, the shapes of the calculated scanned specific intensity profiles are in agreement with those of preliminary measured spectra in LENS-XX. The magnitudes of the calculated radiation along the line of sight to the stagnation point are about 1~2 orders of magnitude higher than the data and need to be studied further.

Original languageEnglish (US)
StatePublished - Sep 11 2013
Externally publishedYes
Event44th AIAA Thermophysics Conference - San Diego, CA, United States
Duration: Jun 24 2013Jun 27 2013

Other

Other44th AIAA Thermophysics Conference
CountryUnited States
CitySan Diego, CA
Period6/24/136/27/13

Fingerprint

shock
Radiation
radiation
steady flow
Steady flow
quasi-steady states
stagnation point
hypersonics
Hypersonic aerodynamics
bows
internal energy
line of sight
collisions
air
profiles
Air
excitation
simulation
Experiments
energy

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanical Engineering
  • Condensed Matter Physics

Cite this

Zhu, T., Li, Z., & Levin Fliflet, D. (2013). Modeling of NO radiation from unsteady and steady shocks using DSMC. Paper presented at 44th AIAA Thermophysics Conference, San Diego, CA, United States.

Modeling of NO radiation from unsteady and steady shocks using DSMC. / Zhu, Tong; Li, Zheng; Levin Fliflet, Deborah.

2013. Paper presented at 44th AIAA Thermophysics Conference, San Diego, CA, United States.

Research output: Contribution to conferencePaper

Zhu, T, Li, Z & Levin Fliflet, D 2013, 'Modeling of NO radiation from unsteady and steady shocks using DSMC', Paper presented at 44th AIAA Thermophysics Conference, San Diego, CA, United States, 6/24/13 - 6/27/13.
Zhu T, Li Z, Levin Fliflet D. Modeling of NO radiation from unsteady and steady shocks using DSMC. 2013. Paper presented at 44th AIAA Thermophysics Conference, San Diego, CA, United States.
Zhu, Tong ; Li, Zheng ; Levin Fliflet, Deborah. / Modeling of NO radiation from unsteady and steady shocks using DSMC. Paper presented at 44th AIAA Thermophysics Conference, San Diego, CA, United States.
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