This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Theoretical and Experimental Analysis of the Siotted-Wall Flow Field in a Transonic Wind Tunnel
Annotation ability available
Sector:
Language:
English
Abstract
The necessity for accurately measuring the performance of aerospace vehicles became paramount with the advent of sustainable, high subsonic-speed flight. However, at these speeds, wind-tunnel test sections with solid-wall boundaries choked and those with open-jet boundaries proved unsteady and inefficient. Noting that wall corrections for solid-wall tunnels were opposite in sign to those applied to open-jet tunnels, research was directed at developing partially open slotted and perforated walls with the hope of eliminating, or at least reducing the magnitude of, the wall-induced error in the data. The success of these endeavors is history as all transonic tunnels today have slotted or perforated walls.
Even though research on these types of walls has continued for over four decades, the existing theory still does not adequately define the flow near the wall. One reason for this is there has been a lack of an experimental data base for analyzing the behavior of the wall flow field adjacent to perforated and slotted-wall geometry configurations. The purpose of this study is to theoretically analyze the slotted-wall flow field to determine the appropriate fundamental form of the boundary condition which exists there, determine the unknown coefficients in the boundary condition using a data base acquired in the Langley Research Center's 6- by 19-inch Transonic Tunnel, and, then, correlate these coefficients with wall-geometry variables and tunnel free-stream conditions.
Recommended Content
Technical Paper | A New Look At Wind Tunnel Flow Quality For Transonic Flows |
Technical Paper | Upgrade of the Pininfarina Wind Tunnel – The New “13-Fan” Drive System |
Technical Paper | On-Road Investigation of a Vehicle's Longitudinal Response to Wind Gusts |
Authors
Citation
Everhart, J., "Theoretical and Experimental Analysis of the Siotted-Wall Flow Field in a Transonic Wind Tunnel," SAE Technical Paper 871757, 1987, https://doi.org/10.4271/871757.Also In
References
- Garner H. C. Rogers E. W. E. Acum W. E. A. Maskell E. C. Subsonic Wind Tunnel Wall Corrections AGARDograph 109 October 1966
- Pindzola M. Lo C. F. Boundary Interference at Subsonic Speeds in Wind Tunnels with Ventilated Walls AEDC TR-69-47 1969
- Pope Alan Harper John J. Low-Speed Wind Tunnel Testing John Wiley & Sons, Inc. 1966
- Pankhurst R. C. Holder D. W. Wind-Tunnel Technique, An Account of Experimental Methods in Low- and High-Speed Wind Tunnels Sir Isaac Pitman & Sons LTD. 1952 1965
- Davis Don D. Sr. Moore Dewey Analytical Studies of Blockage and Lift-Interference Corrections for Slotted Tunnels Obtained by the Substitution of an Equivalent Homogeneous Boundary for the Discrete Slots NACA TM-L-53E075 1953
- Chen C. F. Mears J. W. Experimental and Theoretical Study of Mean Flow Boundary Conditions at Perforated and Longitudinally Slotted Wind Tunnel Walls Arnold Engineering and Development Center TR-57-20 1957
- Baldwin Barrett S. Jr. Turner John B. Knechtel Earl D. Wall Interference in Wind Tunnels with Slotted and Porous Boundaries at Subsonic Speeds NACA TN 3176 1954
- Goethert B. H. Properties of Test Section Walls with Longitudinal Slots in Curved Flow for Subsonic and Supersonic Velocities (Theoretical Investigations) AEDC TN-55-56 1957
- Wood W. W. Tunnel Interference from Slotted Walls Quart. J. Mech. Applied Math. 17 1964
- Berndt S. B. Sorensen Hans Flow Properties of Slotted Walls for Transonic Test Sections AGARD Conference Proceedings No. 174 Paper No. 17 1975
- Everhart Joel L. Barnwell Richard W. A Parametric Experimental Study of the Interference Effects and the Boundary-Condition Coefficient of Slotted Wind-Tunnel Walls Proceedings, AIAA Tenth Aerodynamic Testing Conference 1978
- Everhart Joel L. A Detailed Experimental Study of the Flow in the Vicinity of the Slotted Wall of a Wind Tunnel with Applications to the Homogeneous Slotted wall Boundary Condition 14th Aerodynamic Testing Conference 1986
- Everhart Joel L. Theoretical and Experimental Investigations of the Transonic Slotted-Wall Flow Field and Associated Slotted-Wall Boundary Conditions D. Sc. Dissertation George Washington Univ. Feb. 1988
- Liepmann H. W. Roshko A Elements of Gasdynamics John Wiley & Sons, Inc. 1957
- Barnwell Richard W. Improvements in the Slotted-Wall Boundary Condition Proceedings, AIAA Ninth Aerodynamic Testing Conference 1976
- Ramaswamy M. A. A New Hypothesis on the Cross Flow Characteristics of Slotted Walls 1st Asian Conference on Fluid Mechanics Bangalore, India December, 1980
- Ladson Charles L. Description and Calibration of the Langley 6- by 19-inch Transonic Tunnel NASA TN D-7182 1973
- Igoe William B. Flechner Stuart G.
- Baumeister Theodore Marks Lionel S. Mechanical Engineers' Handbook Sixth Mcgraw-Hill Book Company 1964
- Sedin Y. C.-J. Sorensen H. Computed and Measured Wall Interference in a Slotted Transonic Test Section AIAA 22nd Aerospace Sciences Meeting 1984
- Brownlee K. A. Statistical Theory and Methodology in Science and Engineering Second John Wiley & Sons, Inc. 1965
- Baronti P. Ferri A. Weeks T. Analysis of Wall Modifications in a Transonic Wind Tunnel Advanced Technology Laboratories, TR-181 1973
- Goethert B. H. Transonic Wind Tunnel Testing Nelson W. C. AGARDograph 49 Pergamon Press 1961
- Berndt S. B. Inviscid Theory of Wall Interference in Slotted Test Sections AIAA J. 15 9 September 1977 1278 1287
- Berndt Sune B. Flow Properties of Slotted-Wall Test Sections AGARD Fluid Dynamics Panel Specialist Meeting on Wall Interference in Wind Tunnels Paper No. [illegible] 1982