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Gas-surface energy exchange characterization around a cone in the free-piston-driven shock tunnel

Deep, S and Jagadeesh, G (2021) Gas-surface energy exchange characterization around a cone in the free-piston-driven shock tunnel. In: Journal of Thermophysics and Heat Transfer, 35 (4). pp. 735-750.

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Official URL: https://doi.org/10.2514/1.T6016


This work describes numerical and experimental research in the Indian Hypersonic Shock Tunnel 3 on a blunt cone model and related computation of the facility parameters: nozzle reservoir conditions, nozzle transit time, and freestream conditions. Specialized codes accounting for real gas effects and nonequilibrium are used to obtain facility parameters. Starting at freestream conditions, a physicochemical model is developed in Fluent to simulate the dissociating environment within the shock layer over the model, assuming thermodynamic equilibrium. The model is validated, then invoked with a surface reaction of exothermic chromium oxidation, to study model erosion and gas-surface energy exchange. A mathematical analysis is performed to estimate surface oxidation rate, heat release, and its effect on shock layer temperature and aerodynamic heating. Both the quantities show considerable increase. Experimental measurement of surface heat flux and temperature using thin film gauges and two-color ratio pyrometry, respectively, also show an increase. The Fluent model with an iterative technique is used to show that the actual temperature at stagnation point is about 90 K higher than its counterpart based on line-of-sight averaged measurements. Finally, analytical calculations are performed to obtain the reaction rate parameter as a measure of the degree of dissociation in the shock layer. © 2021, AIAA International. All rights reserved.

Item Type: Journal Article
Publication: Journal of Thermophysics and Heat Transfer
Publisher: AIAA International
Additional Information: The copyright for this article belongs to AIAA International
Keywords: Heat flux; Iterative methods; Nozzles; Surface reactions; Temperature, Blunt cone; Energy exchanges; Experimental research; Fluents; Free piston; Freestream conditions; Numerical research; Reservoir conditions; Shock layer; Shock tunnel, Interfacial energy
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited: 26 Nov 2021 11:10
Last Modified: 26 Nov 2021 11:10
URI: http://eprints.iisc.ac.in/id/eprint/70458

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