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Radiative Heating Indicators and Uncertainty Analysis for Mars 2020This paper will present analysis to evaluate a functional form and associated parameters to determine the radiative heating at various back-shell locations of the Mars 2020 aeroshell. The radiative heating indicators are used for preliminary vehicle design, and to determine the worst-case trajectories for peak radiative heat flux and load. Historically, the functional form for radiative heating is based on free-stream parameters of density, velocity and a length scale, typically the nose-radius (or equivalent). However, a fit of this form has been shown to not provide significant enough accuracy when compared to simulation results. Therefore, a fit based on post-shock equilibrium calculations of CO and CO2 number density, temperature and pressure has been devised. The results from the TPS 15 01 trajectory were used to develop the fit. The fit was then applied to the MSL best estimated trajectory (BET). Furthermore, the paper will quantify the uncertainty in simulations of the radiative heating for Mars 2020.
Document ID
20180007851
Acquisition Source
Ames Research Center
Document Type
Presentation
Authors
Aaron Michael Brandis (Analytical Mechanics Associates (United States) Hampton, Virginia, United States)
Christopher O Johnston (Langley Research Center Hampton, Virginia, United States)
Karl T Edquist (Langley Research Center Hampton, Virginia, United States)
Date Acquired
November 27, 2018
Publication Date
June 25, 2018
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
ARC-E-DAA-TN58070
Meeting Information
Meeting: 2018 AIAA AVIATION Forum
Location: Atlanta, GA
Country: US
Start Date: June 25, 2018
End Date: June 29, 2018
Sponsors: American Institute of Aeronautics and Astronautics
Funding Number(s)
CONTRACT_GRANT: NNA15BB15C
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
Mars 2020
radiation
indicators
uncertainty

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