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Two-dimensional wind-tunnel interference from measurements on two contoursThis paper describes how wall-induced velocities near a model in a two-dimensional wind tunnel can be estimated from upwash distributions measured along two contours surrounding a model. The method is applicable to flows that can be represented by linear theory. It was derived by applying the Schwarz Integral Formula separately to the two contours and by exploiting the free-air relationship between upwashes along the contours. Advantages of the method are that only one flow quantity need by measured and no representation of the model is required. A weakness of the method is that it assumes streamwise interference velocity vanishes far upstream of the model. This method was applied to a simple theoretical model of flow in a solid-wall wind tunnel. The theoretical interference velocities and the velocities computed using the method were in excellent agreement. The method was then used to analyze experimental data acquired during adaptive-wall experiments at Ames Research Center. This analysis confirmed that the wall adjustments reduced wall-induced velocities near the model.
Document ID
19840051672
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Schairer, E. T.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 12, 2013
Publication Date
June 1, 1984
Publication Information
Publication: Journal of Aircraft
Volume: 21
ISSN: 0021-8669
Subject Category
Aerodynamics
Accession Number
84A34459
Distribution Limits
Public
Copyright
Other

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