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Title: Comparison of direct simulation Monte Carlo chemistry and vibrational models applied to oxygen shock measurements

Validation of three direct simulation Monte Carlo chemistry models—total collision energy, Quantum Kinetic, and Kuznetsov state specific (KSS)—is conducted through the comparison of calculated vibrational temperatures of molecular oxygen with measured values inside a normal shock wave. First, the 2D geometry and numerical approach used to simulate the shock experiments is verified. Next, two different vibrational relaxation models are validated by comparison with data for the M = 9.3 case where dissociation is small in the nonequilibrium region of the shock and with newly obtained thermal rates. Finally, the three chemistry model results are compared for M = 9.3 and 13.4 in the region where the vibrational temperature is greatly different from the rotational and translational temperature, and thus nonequilibrium dissociation is important. It is shown that the peak vibrational temperature is very sensitive to the initial nonequilibrium rate of reaction in the chemistry model and that the vibrationally favored KSS model is much closer to the measured peak, but the post-peak behavior indicates that some details of the model still need improvement.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [5]
  1. Asian Office of Aerospace Research and Development, AFOSR, Tokyo (Japan)
  2. ERC Inc, Edwards AFB, California 93524 (United States)
  3. (Russian Federation)
  4. Novosibirsk State University, Novosibirsk (Russian Federation)
  5. Institute of Theoretical and Applied Mechanics, Novosibirsk (Russian Federation)
Publication Date:
OSTI Identifier:
22257010
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Fluids (1994); Journal Volume: 26; Journal Issue: 4; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COLLISIONS; DISSOCIATION; MONTE CARLO METHOD; OXYGEN; PEAKS; SHOCK WAVES; SIMULATION; VALIDATION; VIBRATIONAL STATES