Turbulent Aeroheating Measurements on a 7-deg Half-Angle Sphere-Cone in a High-Enthalpy CO2 Expansion Tunnel
| Autor: | Aaron Dufrene, Matthew MacLean, Michael Barnhardt, Brian R. Hollis, Timothy Wadhams |
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| Rok vydání: | 2018 |
| Předmět: |
Physics
020301 aerospace & aeronautics Turbulence Expansion tunnel Laminar flow 02 engineering and technology Mechanics Mars Exploration Program Exploration of Mars law.invention Physics::Fluid Dynamics 020303 mechanical engineering & transports Pressure measurement Experimental uncertainty analysis 0203 mechanical engineering law Intermittency Physics::Space Physics |
| Zdroj: | 2018 AIAA Aerospace Sciences Meeting. |
| Popis: | A database of heating and pressure measurements on a 7-deg half-angle cone in a highenthalpy expansion tunnel in CO2 has been generated to support development and validation of computational models to be employed in the design of future Mars missions. Laminar, transitional, and turbulent simulations were performed at the test conditions for comparisons with the data. Close agreement was obtained for both fully-laminar and fully turbulent conditions. For the remaining transitional/turbulent conditions, agreement to within, or slightly more than, the estimated experimental uncertainty was demonstrated. The influence of transition intermittency and transition length models on predicted heating levels was demonstrated, as were differences in turbulent heating predictions generated using various algebraic, one-equation, and two-equation turbulence models. These comparisons provide some measure of confidence in turbulent simulation capabilities; however, because the data were not obtained on a relevant entry vehicle geometry, it is not possible to fully quantify computational uncertainties for the definition of Mars mission aerothermodynamic environments at this time |
| Databáze: | OpenAIRE |
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