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Short duration force measurements in impulse facilities

Robinson, Matthew and Hannemann, Klaus (2006) Short duration force measurements in impulse facilities. In: AIAA Conference Proceedings (AIAA-2006-3439), p. 15. American Institute of Aeronautics and Astronautics. 25th AIAA Aerodynamic Measurement Technology and Ground Testing, 2006-06-05 - 2006-06-08, San Francisco, CA (USA).

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A new multiple component stress wave force balance has been designed, calibrated and tested in the High Enthalpy Shock Tunnel Göttingen (HEG) of the German Aerospace Center (DLR). The balance is able to measure forces of short duration (milliseconds) on instrumented models from angles of attack from -40 to 20 degrees. Two models, a blunt cone 303mm long and a standard force reference model (HB-2) of 70mm diameter, are used to establish the accuracy of the force balance. The blunt cone tests were conducted at two different test conditions with a constant Mach number of 7.8 and total enthalpies of 3.0 and 3.5MJ/kg. At 0 degrees angle of attack and an enthalpy of 3.0MJ/kg, the measured axial coefficient was recovered to within 6% when compared to computational fluid dynamic (CFD) simulations. At –10 degrees, the axial and normal coefficients were within 6% and 9% respectively of CFD predictions while the center of pressure (based on chord length) was within 2%. Tests with the HB-2 standard force reference model were conducted at enthalpies ranging from 12 to 22 MJ/kg at an angle of attack of 0 degrees. A linear variation of the axial coefficient with the viscous similarity parameter was predicted with non-equilibrium CFD simulations assuming a laminar boundary layer. The recovered axial force coefficient remained within 6% of the CFD predictions and compared well with experimental results from other wind tunnel facilities. Reasonable comparison of pressure and heat flux measurements along longitudinal symmetry lines of the model was obtained. The accuracy of the force balance is estimated at approximately 5% for the axial component and 4% for the normal and pitching moment components.

Item URL in elib:https://elib.dlr.de/43763/
Document Type:Conference or Workshop Item (Paper)
Title:Short duration force measurements in impulse facilities
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Journal or Publication Title:AIAA Conference Proceedings
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Page Range:p. 15
Publisher:American Institute of Aeronautics and Astronautics
Keywords:Short duration force measurement, shock tube
Event Title:25th AIAA Aerodynamic Measurement Technology and Ground Testing
Event Location:San Francisco, CA (USA)
Event Type:international Conference
Event Start Date:5 June 2006
Event End Date:8 June 2006
Organizer:American Institute of Aeronautics and Astronautics
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):W - Grundlagen Raumtransport - Anlagen und Messtechnik (old)
Location: Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Spacecraft
Deposited By: Brennecke-Hosseinzadeh, Dagmar
Deposited On:21 Aug 2007
Last Modified:24 Apr 2024 19:05

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