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oai:www.ideals.illinois.edu:2142/78575 2023-07-11 col_2142_5131 col_2142_14800 com_2142_5130 com_2142_14799 com_2142_234

Sahai, Amal 2015-07-22T22:18:23Z 2015-07-22T22:18:23Z 2015-05 2015-05-01 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 closure is 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. Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2015-07-22 without embargo terms The student, Amal Sahai, accepted the attached license on 2015-05-01 at 13:35. The student, Amal Sahai, submitted this Thesis for approval on 2015-05-01 at 14:01. This Thesis was approved for publication on 2015-05-01 at 14:23. DSpace SAF Submission Ingestion Package generated from Vireo submission #8233 on 2015-07-22 at 10:35:21 Made available in DSpace on 2015-07-22T22:18:23Z (GMT). No. of bitstreams: 5 SAHAI-THESIS-2015.pdf: 6825535 bytes, checksum: f3a6ebc7b83b17a893774fd608d9a19b (MD5) amal.tex: 141251 bytes, checksum: 5c8f431243fc367d0438e8168e7c74ef (MD5) figures.zip: 29137917 bytes, checksum: 34a6fe4bd0c2ddb3b61302fc3a449dc9 (MD5) references.bib: 18198 bytes, checksum: f03c9518fab8bf0afeb0dccaafe006e2 (MD5) LICENSE.txt: 4207 bytes, checksum: 2bd8cc46541fb9cad55dfca474222534 (MD5) Previous issue date: 2015-05-01 application/pdf http://hdl.handle.net/2142/78575 en Copyright 2015 Amal Sahai High enthalpy flows Hypersonic entry Arc-jet Finite Element Modeling of high enthalpy flows for hypersonic re-entry and ground-based arc-jet testing text text 2015-5 Aerospace Engineering Aerospace Engineering University of Illinois at Urbana-Champaign Thesis M.S.