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

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.