Experimental Simulation of a Galileo Sub-Scale Model at Ice Giant Entry Conditions in the T6 Free-Piston Driven Wind Tunnel

Paper


Steer, Joseph, Collen, Peter, Glenn, Alex, Sopek, Tamara, Hambidge, Christopher, Doherty, Luke, McGilvray, Matthew, Loehle, Stefan and Walpot, Louis. 2022. "Experimental Simulation of a Galileo Sub-Scale Model at Ice Giant Entry Conditions in the T6 Free-Piston Driven Wind Tunnel." 9th International Workshop on Radiation of High Temperature Gases for Space Missions (RHTG-9 2022). Azores, Portugal
Paper/Presentation Title

Experimental Simulation of a Galileo Sub-Scale Model at Ice Giant Entry Conditions in the T6 Free-Piston Driven Wind Tunnel

Presentation TypePaper
AuthorsSteer, Joseph (Author), Collen, Peter (Author), Glenn, Alex (Author), Sopek, Tamara (Author), Hambidge, Christopher (Author), Doherty, Luke (Author), McGilvray, Matthew (Author), Loehle, Stefan (Author) and Walpot, Louis (Author)
Journal or Proceedings TitleProceedings of the 9th International Workshop on Radiation of High Temperature Gases for Space Missions (2022)
Number of Pages11
Year2022
Web Address (URL) of Paperhttps://indico.esa.int/event/394/overview
Conference/Event9th International Workshop on Radiation of High Temperature Gases for Space Missions (RHTG-9 2022)
Event Details
9th International Workshop on Radiation of High Temperature Gases for Space Missions (RHTG-9 2022)
Event Location
Azores, Portugal
Abstract

Uranus and Neptune, known collectively as the Ice Giants, are the only two planets in the solar system that are yet to be explored with a dedicated mission. Planetary entry probe missions to the Ice Giants were proposed in 2010 by NASA and ESA which prompted a resurgence of interest in experimental simulation of the aero-heating environment that would be encountered by such a spacecraft. More recently, the 2023 - 2032 Decadal Survey recommended that NASA’s highest priority new flagship mission should be a Uranus orbiter and probe with a launch date in the early 2030s. The Oxford T6 Stalker tunnel is the only facility in Europe capable of replicating the high speeds required for Ice Giant entry and is therefore a key stepping stone on the path to realising the goal of an Ice Giant mission. In the present work, a 1:10 scaled model of the Galileo probe has been tested at Ice Giant entry conditions. Conditions for nominal composition (85%H215%He), Stalker substituted, and nominal composition with methane (0.5% and 5% CH4) gas mixtures have been developed and validated for use with a new expansion nozzle via a pitot rake survey. Test flows with flight equivalent velocities greater than 18 km/s have been produced with test times on the order of 30 µs. Heat flux into the model for the developed conditions has been inferred from temperature measurements with a series of coaxial thermocouples. High speed video has been captured to aid in characterisation of the test conditions.

Keywordshigh enthalpy; expansion tunnel; ice giants
ANZSRC Field of Research 2020400106. Hypersonic propulsion and hypersonic aerothermodynamics
510203. Nonlinear optics and spectroscopy
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Byline AffiliationsUniversity of Oxford, United Kingdom
German Aerospace Centre, Germany
European Space Agency, France
Institution of OriginUniversity of Southern Queensland
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