EFFECT OF CHEMICAL NON-EQUILIBRIUM ON FLOW PARAMETERS IN THE INTERMEDIATE HYPERSONIC REGIME

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.

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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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IITH Creators:
IITH CreatorsORCiD
Dongari, NishanthUNSPECIFIED
Item Type: Conference or Workshop Item (Paper)
Subjects: Others > Metallurgy Metallurgical Engineering
Divisions: Department of Mechanical & Aerospace Engineering
Depositing User: Team Library
Date Deposited: 08 Mar 2018 06:19
Last Modified: 08 Mar 2018 06:19
URI: http://raiithold.iith.ac.in/id/eprint/3816
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