Hostname: page-component-cd9895bd7-8ctnn Total loading time: 0 Render date: 2024-12-26T08:19:13.167Z Has data issue: false hasContentIssue false
  • English
  • Français

The Effect of a Rear-Mounted Disc on the Drag of a Blunt-Based Body of Revolution

Published online by Cambridge University Press:  07 June 2016

W. A. Mair
W. A. Mair*
Affiliation:
Engineering Laboratory, Cambridge
Get access

Summary

Experiments have shown that the drag of a body of revolution with a blunt base can be substantially reduced by mounting behind the body a disc of rather smaller diameter than the body. With a single disc the base drag was reduced by about 35 per cent and with two discs a reduction of 55 per cent was obtained. When the cavity between the body and the best single disc was filled in to form a solid boat-tailed afterbody there was an even greater reduction of drag.

A single disc mounted nearer to the body than the position giving low drag gave a large increase of drag with severely unsteady flow. The nature of the flow in both the low-drag and high-drag régimes is discussed.

Type
Research Article
Information
Aeronautical Quarterly , Volume 16 , Issue 4 , November 1965 , pp. 350 - 360
Copyright
Copyright © Royal Aeronautical Society. 1965

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1. Rohsenow, W. M., Fink, C. H. and Pollis, S. R. Flow Through Two Orifices in Series. American Society of Mechanical Engineers Paper No. 51-A-87, 1951.Google Scholar
2. Burrows, F. M. On Some Problems Concerning High Lift Suction Aircraft. Ph.D. Dissertation, University of Cambridge, 1961.Google Scholar
3. Migay, V. K. Study of Ribbed Diffusers (in Russian). Teploenergetika, No. 10, 1962. English Translation issued as A.R.C. Paper 25,382, 1963.Google Scholar
4. Pankhurst, R. C. and Holder, D. W. Wind-Tunnel Technique. Pitman, London, 1952.Google Scholar
5. Maskell, E. C. A Theory of the Blockage Effects on Bluff Bodies and Stalled Wings in a Closed Wind Tunnel. A.R.C. R. & M. 3400, 1965.Google Scholar
6. Lock, C. N. H. and Johansen, F. C. Drag and Pressure-Distribution Experiments on Two Pairs of Streamline Bodies. A.R.C. R. & M. 1452, 1933.Google Scholar
7. Ringleb, F. O. Separation Control by Trapped Vortices. Boundary Layer and Flow Control (Ed. Lachmann, G. V.), pp. 265–294. Pergamon Press, 1961.Google Scholar