Report
Report

Author: United States. National Advisory Committee for Aeronautics

Publisher:

Published:

Total Pages: 32

ISBN-13:

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Approximation of the Spanwise Distribution of Wind-tunnel-boundary Interference on Lift of Wings in Rectangular Perforated-wall Test Sections
Approximation of the Spanwise Distribution of Wind-tunnel-boundary Interference on Lift of Wings in Rectangular Perforated-wall Test Sections

Author: Ray H. Wright

Publisher:

Published: 1968

Total Pages: 42

ISBN-13:

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An approximation method has been developed for calculating the spanwise distribution of wind-tunnel-boundary upwash interference on lift of wings in rectangular perforated-wall test sections. This method is applied to square test sections with an assumed effective permeability constant of 0.6. A problem of considerable difficulty in practical application of the method presented is the estimation of an effective permeability constant. Because of the variation of the upwash interference with Mach number and of the influence of boundary layer on the effective permeability factor, the boundary interference in a perforated-wall wind-tunnel test section at high subsonic Mach numbers is likely to be of the nature of that in an open-throat tunnel.

High Speed Problems of Aircraft and Experimental Methods
High Speed Problems of Aircraft and Experimental Methods

Author: Allen F. Donovan

Publisher: Princeton University Press

Published: 2015-12-08

Total Pages: 1021

ISBN-13: 140087503X

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Volume VIII of the High Speed Aerodynamics and Jet Propulsion series. This volume includes: performance calculation at high speed; stability and control of high speed aircraft; aeroelasticity and flutter; model testing; transonic wind tunnels; supersonic tunnels; hypersonic experimental facilities; low density wind tunnels; shock tube; wind tunnel measurements; instrumented models in free flight; piloted aircraft testing; free flight range methods. Originally published in 1961. The Princeton Legacy Library uses the latest print-on-demand technology to again make available previously out-of-print books from the distinguished backlist of Princeton University Press. These editions preserve the original texts of these important books while presenting them in durable paperback and hardcover editions. The goal of the Princeton Legacy Library is to vastly increase access to the rich scholarly heritage found in the thousands of books published by Princeton University Press since its founding in 1905.

Test Sections for Small Theoretical Wind-tunnel-boundary Interference on V/STOL Models
Test Sections for Small Theoretical Wind-tunnel-boundary Interference on V/STOL Models

Author: Ray H. Wright

Publisher:

Published: 1968

Total Pages: 92

ISBN-13:

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A wind-tunnel test section with closed upper wall, slotted side walls, and open lower boundary was found theoretically to produce zero tunnel-boundary lift interference on a small wing with horizontal wake mounted at the center of the test section. For this test section the variation of the interference with angle of the vortex wake behind a high-lift-coefficient model was not large. Because of the small slot widths required for zero interference and of the effects of boundary layer, the theory is regarded as unreliable for predicting the slot widths required; however, the variation of the interference with the slot width for widths somewhat greater than those needed for zero interference was found to be small. The interference in the region likely to be occupied by the tall of a model was investigated in some detail and was found to change with slot width and with wake angle more strongly than did the interference at the lifting element. A limited investigation of the lift interference in a test section with closed upper wall and slotted side and lower boundaries was made to obtain the theoretically indicated slot width required for zero lift interference at a center-mounted wing with the wake horizontal.

Wind-tunnel Lift Interference on Sweptback Wings in Rectangular Test Sections with Slotted Top and Bottom Walls
Wind-tunnel Lift Interference on Sweptback Wings in Rectangular Test Sections with Slotted Top and Bottom Walls

Author: Ray H. Wright

Publisher:

Published: 1966

Total Pages: 28

ISBN-13:

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A theory is presented for the boundary-induced up-wash interference on a sweptback lifting wing mounted at the center of a rectangular wind-tunnel test section with slotted top and bottom walls and closed side walls. A sample calculation for a wing spanning 0.7 of the width of a square tunnel shows the span-wise variation in the interference characteristic of this type of test section. For this example, the wing sweep did not have a large effect on the interference.