Modeling of high enthalpy flows for hypersonic re-entry and ground-based arc-jet testing

High enthalpy flows;Hypersonic entry;Arc-jet;Finite Element

Sahai, Amal

关键词: High enthalpy flows;    Hypersonic entry;    Arc-jet;    Finite Element;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/78575/SAHAI-THESIS-2015.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

This work presents a simulation framework for modeling high enthalpy ionized gas flows during planetary entry flights and ground-based arc-jet testing. The system of Favre-averaged Navier-Stokes equations in thermo-chemical non-equilibrium with Spalart-Allmaras turbulence closureis outlined, along with models for thermodynamics, chemical kinetics, transport properties, and the applied electric field. The electric field and the Joule heating term are computed using a Poisson equation and the generalized Ohm's law. A standard two-temperature model is implemented to account for non-equilibrium effects. A numerical method based on the streamline upwind Petrov-Galerkin (SUPG) finite element formulation is utilized. A two-way loose coupling strategy between the flow solver and the electric field is introduced to achieve convergence. The methodology is first tested by modeling hypersonic axisymmetric flows over a blunt body for a range of increasingly complex flight conditions. We then apply it to simulate the flow-field and electrical discharge inside the 20 MW NASA Ames Aerodynamic Heating facility (AHF) to further confirm the capabilities and robustness of the developed framework.