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Development of a multicomponent force and moment balance for water tunnel applications, volume 2The principal objective of this research effort was to develop a multicomponent strain gauge balance to measure forces and moments on models tested in flow visualization water tunnels. Static experiments (which are discussed in Volume 1 of this report) were conducted, and the results showed good agreement with wind tunnel data on similar configurations. Dynamic experiments, which are the main topic of this Volume, were also performed using the balance. Delta wing models and two F/A-18 models were utilized in a variety of dynamic tests. This investigation showed that, as expected, the values of the inertial tares are very small due to the low rotating rates required in a low-speed water tunnel and can, therefore, be ignored. Oscillations in pitch, yaw and roll showed hysteresis loops that compared favorably to data from dynamic wind tunnel experiments. Pitch-up and hold maneuvers revealed the long persistence, or time-lags, of some of the force components in response to the motion. Rotary-balance experiments were also successfully performed. The good results obtained in these dynamic experiments bring a whole new dimension to water tunnel testing and emphasize the importance of having the capability to perform simultaneous flow visualization and force/moment measurements during dynamic situations.
Document ID
19950012541
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Suarez, Carlos J. (Eidetics International, Inc. Torrance, CA, United States)
Malcolm, Gerald N. (Eidetics International, Inc. Torrance, CA, United States)
Kramer, Brian R. (Eidetics International, Inc. Torrance, CA, United States)
Smith, Brooke C. (Eidetics International, Inc. Torrance, CA, United States)
Ayers, Bert F. (Eidetics International, Inc. Torrance, CA, United States)
Date Acquired
September 6, 2013
Publication Date
December 1, 1994
Publication Information
Publisher: NASA
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NAS 1.26:4642-VOL-2
H-2030-VOL-2
NASA-CR-4642-VOL-2
Accession Number
95N18956
Funding Number(s)
CONTRACT_GRANT: NAS2-13571
PROJECT: RTOP 505-59-53
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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