Gijare, H and Bhagat, A and Dongari, Nishanth
(2018)
EFFECT OF CHEMICAL NON-EQUILIBRIUM ON FLOW
PARAMETERS IN THE INTERMEDIATE HYPERSONIC REGIME.
In: Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017), 27-30, December 2017, BITS-Pilani, Hyderabad.
Abstract
The new solver hypersonicIithFoam has been developed in
the OpenFOAM framework. OpenFOAM has rhoCentralFoam
which is a density based N-S solver, is used as a base solver.
Additional features are incorporated to model reacting flows,
variable multi-species diffusion and thermodynamic proper-
ties of high-temperature air. The solver is implemented to
model the transport properties based on a kinetic theory for its
widespread applicability. Viscosity and Thermal conductivity are
obtained using the model based on Lennard-Jones potential, and
Chapman-Enskog diffusivity model is used to compute binary dif-
fusion coefficient. Multicomponent mixture properties are calcu-
lated based on a mole fraction. All species are assumed to be in
thermodynamic equilibrium, so the state of the gas is governed
by single equilibrium temperature. The solver is tested with the
available experimental data for Heat flux and coefficient of pres-
sure Cp distribution over a surface of ELECTRE article. The hy-
personic solver is shown significant improvement over a conven-
tional compressible solver. Simulations are carried out for the
flow over a sphere at different altitudes using both the conven-
tional and the hypersonic solver for qualitative and quantitative
comparisons. Post shock temperature and peak heat flux values
are remarkably reduces due to the implementation of real gas ef-
fects and air chemistry. Rarefaction effects become significant
from 70 km.
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