Evaluation of measured-boundary-condition methods for 3D subsonic wall interference

Evaluation of measured-boundary-condition methods for 3D subsonic wall interference

Labrujère, T.E.
Maarsingh, R.A.
Smith, J.

National Aerospace Laboratory NLR

1988-03-31

Measurements on a simple aircraft model in both an appropriately sized and a relatively large, low-speed, solid-wall test section were used to analyse the accuracy and consistency of measured-boundary-condition (MBC) methods. For completeness, the classical method of images, with two different correction procedures, was also analysed. For the MBC methods, large reductions in the amount of in situ measured boundary data turn out to be possible, while almost retaining the accuracy obtained from abundant boundary data. In addition, high computing efficiency was achieved allowing on-line wall interference assessment and correction during a wind tunnel test. Surprisingly, the classical assessment method turns out to be competitive with the MBC methods for the mode and test conditions considered (CL < 2, no massive flow separation). However, it must be stressed, that its applicability is limited, like any method reduiring a theoretical representation of the mode flow. Some attention was paid to the definition of the reaction of the model to the wall-induced velocity field, i.e. the correction procedure. The analyses suggest that improvements and/or adaptations in this report are desirable.

Wind tunnel walls
Aerodynamic interference
Correction
Subsonic flow
Solid surfaces
Wall pressure
Wind tunnel tests
Slots
Algorithms
Three dimensional flow
Boundary volume problems
Schwartz method
Flow velocity
Runtime (computers)

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Nationaal Lucht- en Ruimtevaartlaboratorium

Campus only

NLR-TR 88072 U

Aerospace Engineering Reports

report

(c)1988 National Aerospace Laboratory NLR