NDLI: Shock radiation tests for saturn and uranus entry probes

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Shock radiation tests for saturn and uranus entry probes

Content Provider	NASA Technical Reports Server (NTRS)
Author	Cruden, Brett A. Bogdanoff, David W.
Copyright Year	2014
Description	This paper describes a test series in the Electric Arc Shock Tube at NASA Ames Research Center with the objective of quantifying shock-layer radiative heating magnitudes for future probe entries into Saturn and Uranus atmospheres. Normal shock waves are measured in Hydrogen/Helium mixtures (89:11 by mole) at freestream pressures between 13-66 Pa (0.1-0.5 Torr) and velocities from 20-30 km/s. No shock layer radiation is detected below 25 km/s, a finding consistent with predictions for Uranus entries. Between 25-30 km/s, radiance is quantified from the Vacuum Ultraviolet through Near Infrared, with focus on the Lyman-alpha and Balmer series lines of Hydrogen. Shock profiles are analyzed for electron number density and electronic state distribution. The shocks do not equilibrate over several cm, and distributions are demonstrated to be non-Boltzmann. Radiation data are compared to simulations of Decadal survey entries for Saturn and shown to be significantly lower than predicted with the Boltzmann radiation model.
File Size	702109
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20160003113
Archival Resource Key	ark:/13960/t3sv2ks2f
Language	English
Publisher Date	2014-06-22
Access Restriction	Open
Subject Keyword	Saturn Probe Radiative Heating Shock Tube Normal Shock Waves Planetary Atmospheres Computational Fluid Dynamics Electron Density Concentration Hydrogen Shock Tests Helium Balmer Series Atmospheric Entry Gas Mixtures Saturn Planet Near Infrared Radiation Lyman Spectra Space Probes Far Ultraviolet Radiation Uranus Planet Shock Tubes Radiation Measurement Radiative Heat Transfer Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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