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The Evaluation of Cryogenic Force Balance Calibration Methodologies with Respect to Wind Tunnel ResultsIndependent tests of the NASA Common Research Model (CRM) at NASA's National Transonic Facility (NTF) and the European Transonic Windtunnel (ETW) revealed discrepancies at low operating temperatures and high Reynolds numbers that warranted further investigation. Since each facility used their own force balance for their tunnel entry, one suggestion for the discrepancy was the temperature compensation methodology developed and applied for each balance. This hypothesis is explored through simulation and experimentally. Independent calibrations of NASA's NTF-118A balance at NASA Langley and ETW reveal discrepancies in the thermal compensation of the normal force and pitching moment primary sensitivities with temperature, while the axial force primary sensitivities are in good agreement. The application of the force balance calibrations performed at NASA and ETW to the prior wind tunnel data suggests that the thermal compensation discrepancies are an order of magnitude less than the discrepancies observed between the wind tunnel aerodynamic coefficients.
Document ID
20190027135
Acquisition Source
Langley Research Center
Document Type
Conference Paper
Authors
Burns, Devin E.
(NASA Langley Research Center Hampton, VA, United States)
Toro, Kenneth G.
(NASA Langley Research Center Hampton, VA, United States)
Parker, Peter A.
(NASA Langley Research Center Hampton, VA, United States)
Rivers, S. Melissa
(NASA Langley Research Center Hampton, VA, United States)
Quix, Harald
(ETW (European Transonic Wind Tunnel) Cologne, Germany)
Wright, Martin
(ETW (European Transonic Wind Tunnel) Cologne, Germany)
Date Acquired
July 10, 2019
Publication Date
May 14, 2018
Subject Category
Aerodynamics
Report/Patent Number
NF1676L-29145
Meeting Information
Meeting: International Symposium on Strain-Gage Balances
Location: Cologne
Country: Germany
Start Date: May 14, 2018
End Date: May 17, 2018
Sponsors: ETW (European Transonic Wind Tunnel)
Funding Number(s)
WBS: 147016.03.07.01.13.02
Distribution Limits
Public
Copyright
Public Use Permitted.
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