Comparison of Numerical Simulations and PLIF Imaging Results of Hypersonic
Reactive Flows around Blunt Projectiles
K. Toshimitsu (Kyushu Univ.),
A. Matsuo (Keio Univ.),
M. R. Kamel (Stanford Univ.),
C. I. Morris (Stanford Univ.),
and
R. K. Hanson (Stanford Univ.)
Abstract
This paper shows comparisons between computational fluid dynamics (CFD)
calculations and PLIF and Schlieren measurements of inert and reactive
hypersonic flows around 2D and axisymmetric bodies. In particular, both
hydrogen-oxygen and methane-oxygen chemical reactions are considered for
the shock-induced combustion in hypersonic flows. The hydrogen-oxidation
mechanism consists of an existing mechanism of 8 reacting species and 19
elementary reactions. The reduced model of the methane-oxidation mechanism
is newly derived from the GRI-Mech 1.2 optimized detailed chemical reaction
mechanism, and consists of 14 species and 19 chemical reaction steps. Both
chemical reaction mechanisms are combined with a point-implicit Euler CFD
code. The OH species density distributions of the present numerical calculations
and imaging experiments for both mixtures are found to be in qualitative
agreement.
Graphcal Examples
Comparison of OH species density distributions and bow
shock profiles by CFD calculation, OH PLIF and Schlieren imaging results
around the hemispheric body.
-
H2-O2 Combustion:
Conditions are as follows; Upstream Mach Number = 5.2 (1960m/s), Upstream
Stagnation Pressure = 0.112atm, Upstream Stagnation Temperature = 350K,
Mixutre of species (H2/O2/N2, Mole fraction) = 10/5/85, D =19mm
-
CH4-O2 Combustion:
Conditions are as follows; Upstream Mach Number = 6.7 (2150m/s), Upstream
Stagnation Pressure = 0.064atm, Upstream Stagnation Temperature = 260K,
Mixutre of species (CH4/O2/N2, Mole fraction) = 16.7/33.3/50.0, D =19mm
Reference:
Kazu Toshimitsu, Akiko Matsuo, Michel R. Kamel, Christopher I. Morris
and Ronald K. Hanson, Comparison of Numerical Simulations and PLIF Imaging
Results of Hypersonic Inert and Reactive Flows around Blunt Projectiles,
Ram Accelerators, Springer-Verlag, 1998, pp. 235-242.
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