Accession Number : ADA532060


Title :   Ionizing Shocks in Argon. Part 2: Transient and Multi-Dimensional Effects (Preprint)


Descriptive Note : Journal article


Corporate Author : AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE


Personal Author(s) : Kapper, M G ; Cambier, J -L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a532060.pdf


Report Date : 09 Sep 2010


Pagination or Media Count : 11


Abstract : We extend the computations of ionizing shocks in argon to unsteady and multi-dimensional, using a collisional-radiative model and a single-fluid, two-temperature formulation of the conservation equations, described in part 1 of this article. We show that the fluctuations of the shock structure observed in shock-tube experiments can be reproduced by the numerical simulations, and explained on the basis of the coupling of the non-linear kinetics of the collisional-radiative model with wave propagation within the induction zone. The mechanism is analogous to instabilities of detonation waves and also produces a cellular structure commonly observed in gaseous detonations. We suggest that the detailed simulations of such unsteady phenomena can yield further information for the validation of non-equilibrium kinetics.


Descriptors :   *SHOCK TUBES , *ARGON , VALIDATION , MODELS , EXPERIMENTAL DESIGN , NUMERICAL ANALYSIS , GASES , NONLINEAR SYSTEMS , WAVE PROPAGATION , SHOCK , KINETICS , NONEQUILIBRIUM FLOW , CONSERVATION , EQUATIONS , INSTABILITY , MULTIPURPOSE , DETONATIONS , INDUCTION SYSTEMS , CELL STRUCTURE , DETONATION WAVES , TRANSIENTS , RADIATION


Subject Categories : Inorganic Chemistry
      Test Facilities, Equipment and Methods


Distribution Statement : APPROVED FOR PUBLIC RELEASE