NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Assessment of CFD Hypersonic Turbulent Heating Rates for Space Shuttle OrbiterTurbulent CFD codes are assessed for the prediction of convective heat transfer rates at turbulent, hypersonic conditions. Algebraic turbulence models are used within the DPLR and LAURA CFD codes. The benchmark heat transfer rates are derived from thermocouple measurements of the Space Shuttle orbiter Discovery windward tiles during the STS-119 and STS-128 entries. The thermocouples were located underneath the reaction-cured glass coating on the thermal protection tiles. Boundary layer transition flight experiments conducted during both of those entries promoted turbulent flow at unusually high Mach numbers, with the present analysis considering Mach 10{15. Similar prior comparisons of CFD predictions directly to the flight temperature measurements were unsatisfactory, showing diverging trends between prediction and measurement for Mach numbers greater than 11. In the prior work, surface temperatures and convective heat transfer rates had been assumed to be in radiative equilibrium. The present work employs a one-dimensional time-accurate conduction analysis to relate measured temperatures to surface heat transfer rates, removing heat soak lag from the flight data, in order to better assess the predictive accuracy of the numerical models. The turbulent CFD shows good agreement for turbulent fuselage flow up to Mach 13. But on the wing in the wake of the boundary layer trip, the inclusion of tile conduction effects does not explain the prior observed discrepancy in trends between simulation and experiment; the flight heat transfer measurements are roughly constant over Mach 11-15, versus an increasing trend with Mach number from the CFD.
Document ID
20110013213
Document Type
Conference Paper
Authors
Wood, William A. (NASA Langley Research Center Hampton, VA, United States)
Oliver, A. Brandon (NASA Johnson Space Center Houston, TX, United States)
Date Acquired
August 25, 2013
Publication Date
June 27, 2011
Subject Category
Space Transportation and Safety
Report/Patent Number
AIAA Paper 2011-3327
NF1676L-10834
Meeting Information
42nd AIAA Thermophysics Conference(Honolulu, HI)
Funding Number(s)
WBS: WBS 599489.02.07.07.04.11.22
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

NameType 20110013213.pdf STI