NDLI: A two-dimensional adaptive-wall test section with ventilated walls in the ames 2- by 2-foot transonic wind tunnel

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A two-dimensional adaptive-wall test section with ventilated walls in the ames 2- by 2-foot transonic wind tunnel

Content Provider	NASA Technical Reports Server (NTRS)
Author	Lee, George McDevitt, T. Kevin Schairer, Edward T.
Copyright Year	1989
Description	The first tests conducted in the adaptive-wall test section of the Ames Research Center's 2- by 2-Foot Transonic Wind Tunnel are described. A procedure was demonstrated for reducing wall interference in transonic flow past a two-dimensional airfoil by actively controlling flow through the slotted walls of the test section. Flow through the walls was controlled by adjusting pressures in compartments of plenums above and below the test section. Wall interference was assessed by measuring (with a laser velocimeter) velocity distributions along a contour surrounding the model, and then checking those measurements for their compatibility with free-air far-field boundary conditions. Plenum pressures for minimum wall interference were determined from empirical influence coefficients. An NACA 0012 airfoil was tested at angles of attach of 0 and 2, and at Mach numbers between 0.70 and 0.85. In all cases the wall-setting procedure greatly reduced wall interference. Wall interference, however, was never completely eliminated, primarily because the effect of plenum pressure changes on the velocities along the contour could not be accurately predicted.
File Size	2509606
Page Count	64
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19900004091
Archival Resource Key	ark:/13960/t58d4t77r
Language	English
Publisher Date	1989-08-01
Access Restriction	Open
Subject Keyword	Research And Support Facilities (air) Transonic Flow Pressure Effects Laser Doppler Velocimeters Transonic Wind Tunnels Airfoils Velocity Distribution Wind Tunnel Walls Free Atmosphere Contours Far Fields Wall Flow Wind Tunnel Tests Aerodynamic Interference Mach Number Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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