Hostname: page-component-848d4c4894-xfwgj Total loading time: 0 Render date: 2024-06-26T15:58:27.537Z Has data issue: false hasContentIssue false
  • English
  • Français

A Study of Slots, Rings & Boundary Layer Control by Blowing

Published online by Cambridge University Press:  28 July 2016

H. C. H. Townend
Get access Rights & Permissions [Opens in a new window]

Extract

In this paper a study has been made of certain cases of airflow in which various means are employed to control the behaviour of the air so as to prevent breakdown in the flow and the resulting turbulence. It is mainly an attempt to analyse the evidence which exists on such phenomena as slots, rings and boundary layer control by means of blowing through backwardly–directed slots in the surface, and to determine, if possible, the extent to which their apparent similarity corresponds, if at all, to an identity of physical principle.

A great deal of experimental work has been done at various times on such devices, and in this paper some of the published results are discussed and an attempt made to correlate them. In addition, some further experiments have been made to fill up gaps in the data available, or to extend their scope. They include other examples of control of airflow at sharp corners (Part I.); some of the cases considered differ widely from others, but all exhibit the reduction in eddying which results from assisting air to negotiate sharp corners or bluff obstacles with the least disturbance possible.

Type
Research Article
Information
The Aeronautical Journal , Volume 35 , Issue 248 , August 1931 , pp. 711 - 743
Copyright
Copyright © Royal Aeronautical Society 1931

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) N.A.C.A. Techl. Note No. 286. Preliminary Investigation on Boundary Layer Control by means of suction and pressure with the U.S.A. 27 aerofoil. E. G. Reid and M. J. Bamber.Google Scholar
(2) R.&M. 1100. Wind Tunnel experiments on the Effect on the maximum lift of withdrawing and discharging air from the upper surface of an aerofoil. W. G. A. Perring and G. P. Douglas.Google Scholar
(3) R.&M. 1267. Reduction of Drag of Radial Engines by the attachment of Rings of Aerofoil section, including interference experiments of an allied nature, with some further applications. H. C. H. Townend.Google Scholar
(4) N.A.C.A. Techl. Note No. 323. Wind Tunnel tests on Airfoil Boundary Layer control, using a backward opening slot. Montgomery Knight and M. J. Bamber.Google Scholar
(5) R.&M. 1063. Model experiments on R.A.F. 31 aerofoil with Handley Page Slot. H. B. Irving, A. S. Batson and D. H. Williams.Google Scholar
(6) R.&M. 1349. On rendering Airflow visible by means of hot wires. H. C. H. Townend.Google Scholar
(7) R.&M, 1209. Wool-tufts. A direct method of discriminating between steady and turbulent airflow over the wing surfaces of aircraft in flight; applied to explore the region of effect of the slot on a Bristol Fighter wing. Flt.-Lieut. J. A. G. Haslam.Google Scholar
(8) R.&M. 930. Summary of data on Slotted Wings obtained in the wind tunnel of Messrs. Handley Page, Ltd. H. B. Irving and A. S. Batson.Google Scholar
(9) Slotted Wings; F. Handley Page. Paper to International Air Congress, London, 1923.Google Scholar
(10) 16th Wilbur Wright Memorial Lecture. F. Handley Page. Journal of the Royal Aeronautical Society, August, 1928.Google Scholar
(11) N.A.C.A. Technical Note No. 308. Pressure distribution on a Slotted R.A.F. 31 airfoil in the Variable Density Wind Tunnel. E. N. Jacobs.Google Scholar
(12) R.&M. 1055. Tests on Handley Page Aerofoil A. 1. and R.A.F. 31. Messrs. Handley Page, Ltd.Google Scholar
(13) R.&M. 1225. Wind Tunnel tests of a R.A.F. 30 wing fitted with a self-setting slotted wing (Pilot Plane). F. B. Bradfield and S, Scott Hall.Google Scholar
(14) R.&M. 1145. Wind Tunnel tests on a R.A.F. 15 Aerofoil with Pilot Planes. F. B. Bradfield and K. W. Clark.Google Scholar
(15) R.&M. 1213. Wind Tunnel tests on aerofoils with Pilot Planes. F. B. Bradfield and K. W. Clark.Google Scholar
(16) R.&M. 1190. Wind Tunnel experiments on the design of an automatic slot for R.A.F. 31 section. F. B. Bradfield and F. W. G. Greener.Google Scholar
(17) R.&M. 1165. Wind Tunnel experiments on the design of an automatic slot for R.A.F. 28 section and on interconnection with ailerons. F. B. Bradfield and K. W. Clark.Google Scholar
(18) T. 2025. On the results of experiments on Slotted Wings. G. Lachmann. (Extract from Z.F.M. for May 26th, August 26th, and September 26th. 1924.)Google Scholar
(19) N.A.C.A. Report No. 271. Pressure distribution tests on PW-9 Wing Models, showing effects of biplane interference. A. J. Fairbanks.Google Scholar