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Coupled Fluids-Radiation Analysis of a High-Mass Mars Entry VehicleThe NEQAIR line-by-line radiation code has been incorporated into the DPLR Navier-Stokes flow solver such that the NEQAIR subroutines are now callable functions of DPLR. The coupled DPLR-NEQAIR code was applied to compute the convective and radiative heating rates over high-mass Mars entry vehicles. Two vehicle geometries were considered - a 15 m diameter 70-degree sphere cone configuration and a slender, mid-L/D vehicle with a diameter of 5 m called an Ellipsled. The entry masses ranged from 100 to 165 metric tons. Solutions were generated for entry velocities ranging from 6.5 to 9.1 km/s. The coupled fluids-radiation solutions were performed at the peak heating location along trajectories generated by the Traj trajectory analysis code. The impact of fluids-radiation coupling is a function of the level of radiative heating and the freestream density and velocity. For the high-mass Mars vehicles examined in this study, coupling effects were greatest for entry velocities above 8.5 km/s where the surface radiative heating was reduced by up 17%. Generally speaking, the Ellipsled geometry experiences a lower peak radiative heating rate but a higher peak turbulent convective heating rate than the MSL-based vehicle.
Document ID
20110015018
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Palmer, Grant (Engineering Research and Consulting, Inc. Huntsville, AL, United States)
Allen, Gary (Engineering Research and Consulting, Inc. Huntsville, AL, United States)
Tang, Chun (NASA Ames Research Center Moffett Field, CA, United States)
Brown, Jim (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 25, 2013
Publication Date
June 27, 2011
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
ARC-E-DAA-TN3787
Meeting Information
Meeting: 42nd AIAA Thermophysics Conference
Location: Honolulu, HI
Country: United States
Start Date: June 27, 2011
End Date: June 30, 2011
Sponsors: American Inst. of Aeronautics and Astronautics
Funding Number(s)
CONTRACT_GRANT: NNA10DE12C
Distribution Limits
Public
Copyright
Public Use Permitted.

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