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Capabilities of wind tunnels with two-adaptive walls to minimize boundary interference in 3-D model testingAn initial wind tunnel test was made to validate a new wall adaptation method for 3-D models in test sections with two adaptive walls. First part of the adaptation strategy is an on-line assessment of wall interference at the model position. The wall induced blockage was very small at all test conditions. Lift interference occurred at higher angles of attack with the walls set aerodynamically straight. The adaptation of the top and bottom tunnel walls is aimed at achieving a correctable flow condition. The blockage was virtually zero throughout the wing planform after the wall adjustment. The lift curve measured with the walls adapted agreed very well with interference free data for Mach 0.7, regardless of the vertical position of the wing in the test section. The 2-D wall adaptation can significantly improve the correctability of 3-D model data. Nevertheless, residual spanwise variations of wall interference are inevitable.
Document ID
19890011590
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Rebstock, Rainer (NASA Langley Research Center Hampton, VA, United States)
Lee, Edwin E., Jr. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 5, 2013
Publication Date
March 1, 1989
Publication Information
Publication: Transonic Symposium: Theory, Application, and Experiment, Volume 1, Part 2
Subject Category
Research And Support Facilities (Air)
Accession Number
89N20961
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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