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Wind tunnel interference in dynamic measurements

Published online by Cambridge University Press:  04 July 2016

W. Q. Molyneux
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Extract

The main object of tests on models in wind tunnels is to obtain results of direct application to aircraft in flight. Unfortunately, the flow about a model in a wind tunnel is subject to constraints that are absent in flight, and so allowance must be made for these wind tunnel interference effects for the results to be meaningful.

There is a considerable body of information on the sources of wind tunnel interference and, so far as effects in steady flow are concerned, methods of estimating the corrections to be applied are generally available. They enable results of wind tunnel tests to be reduced to equivalent flight results with some measure of confidence. The situation is far less satisfactory for oscillating models. The additional interference effects due to frequency of the motion may be of too complex a nature or require too tedious a computation (particularly for a deforming model) for a reliable reduction of the results to flight conditions to be practicable.

Type
Technical notes
Information
The Aeronautical Journal , Volume 76 , Issue 739 , July 1972 , pp. 426 - 432
Copyright
Copyright © Royal Aeronautical Society 1972 

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References

1. Pankhurst, R. C. and Holder, D. W. Wind tunnel technique. Chapter 8. Pitman and Sons, London.Google Scholar
2. Goethert, B. H. Transonic wind tunnel testing. AGARD 49. Pergamon Press, London.Google Scholar
3. Glauert, H. Wind tunnel interference on wings, bodies and airscrews. ARC R & M 1566, 1933.Google Scholar
4. Jones, W. P. Wind tunnel interference effects on the values of experimentally determined derivative coefficients for oscillating aerofoils. ARC R & M 1912, 1943.Google Scholar
5. Jones, W. P. Wind tunnel interference effects on measurements of aerodynamic coefficients for oscillating aerofoils. ARC R & M 2786, 1958.Google Scholar
6. Acum, W. E. A. Wall corrections for wings oscillating in wind tunnels of closed rectangular section. Part I— Theory and tables. ARC 19593, October 1957. Part II— Applications to a delta planform in a 9X7 tunnel. ARC 19756, January 1958.Google Scholar
7. Acum, W. E. A., and Garner, H. C. Approximate wall corrections for an oscillating swept wing in a wind tunnel of closed circular section. ARC CP 184, January 1954.Google Scholar
8. Goodman, T. R. The upwash corrections for an oscillating wing in a wind tunnel. J. Ae. Sc, June 1963.Google Scholar
9. Acum, W. E. A. A note on the estimation of the effect of wind tunnel walls on the forces on slowly oscillating slender wings. NPL Aero Note 1014 (ARC 24732), April 1963.Google Scholar
10. Runyan, H. L. and Watkins, S. W. Considerations of the effects of wind tunnel walls on oscillating air forces for two-dimensional compressible flow. NACA Report 1150. 1953.Google Scholar
11. Jones, W. P. Wind tunnel interference effects on oscillating aerofoils in subsonic flow. ARC R & M 2943, 1953.Google Scholar
12. Runyan, H. L., Woolston, D. S. and Rainey, A. G. Theoretical and experimental investigation of the effect of tunnel walls on the forces acting on an oscillating airfoil in two-dimensional compressible flow. NACA Report 1262, 1956.Google Scholar
13. Widmayer, E., Clevenson, S. A. and Leadbetter, S. A. Some measurements of aerodynamic forces and moments at subsonic speeds on a rectangular wing of aspect ratio 2 oscillating about the midchord. NACA TN 4240, May 1958.Google Scholar
14. Marschner, B. W. The flow over a body in a choked wind tunnel and in a sonic free jet. J. Ae. Sc. Vol 23, April 1956.Google Scholar
15. Ritchie, V. S. and Pearson, A. O. Calibration of slotted test section of the Langley 8 ft transonic tunnel and preliminary experimental investigations of boundary-layer-reflected disturbances. NACA RML-51K14, July 1952.Google Scholar
16. Acum, W. E. A. Resonance for subsonic flow in wind tunnels with slotted walls. NPL Aero Rep 1012. (ARC 23717), April 1962.Google Scholar
17. Drake, D. G. The oscillating two-dimensional aerofoil between porous walls. The Aeronautical Quarterly. Vol VIII, August 1957.Google Scholar
18. Drake, D. G. Wind tunnel interference for oscillating wings at transonic speeds. ARC 21489, December 1959.Google Scholar
19. Wight, K. C. A review of slotted-wall wind tunnel interference effects on oscillating models in subsonic and transonic flows. NPL Aero Report 1074, (ARC 25138), September 1963.Google Scholar
20. Bratt, J. B. and Wight, K. C. Measurements of pitching oscillation derivatives at subsonic and transonic speeds for an M-wing. ARC 21661, February 1960.Google Scholar
21. Batchelor, G. K. Sound in wind tunnels. Australian Council for Aeronautics Rep. 18, June 1945.Google Scholar
22. Van Damme, J. Elimination of sound vibrations in the 15 ft spinning tunnel. Nat. Res. Counc. Canada Rep. MA-117, 1943.Google Scholar
23. Jordan, P. F. The harmonically oscillating wing with finite vortex trail. ARC R & M 3038, July 1953.Google Scholar
24. Jones, J. P. The influence of the wake on the flutter and vibration of rotor blades. ARC 18173, January 1956.Google Scholar
25. Loewy, R. G. A two-dimensional approximation to the unsteady aerodynamics of rotary wings. J. Ae. Sc, Vol 24, February 1957.Google Scholar
26. Molyneux, W. G. An approximate theoretical approach for the determination of the oscillatory aerodynamic coefficients for a helicopter rotor in forward flight. The Aeronautical Quarterly, Vol XIII, ARC 22424, December 1960.Google Scholar
27. Molyneux, W. G. The stability of a wind tunnel model on flexible supports. Journal of the Royal Aeronautical Society, Tech Note Structures 348, February 1964.Google Scholar