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The Static Hole Pair as a Skin Friction Meter

Published online by Cambridge University Press:  04 July 2016

J. Duffy  and
J. F. Norbury
J. Duffy
Affiliation:
Department of Mechanical Engineering, Liverpool College of Technology
J. F. Norbury
Affiliation:
Department of Mechanical Engineering (Fluid Mechanics), University of Liverpool
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Extract

In a recent technical note Rajaratnam has pointed out the possibility of using the pressure difference measured between two static pressure holes of different diameter as a means of determining skin friction. The device exploits the fact that for any hole there is an error in measurement of static pressure which depends both on the hole diameter and on local skin friction, as Shaw has demonstrated. Consequently the difference in pressure measured between two adjacent holes of different diameter will be a function of the skin friction. In this note the device will be called a “static hole pair”. The larger hole will be referred to as the “test” hole, and the smaller hole as the “reference” hole.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 71 , Issue 673 , January 1967 , pp. 55 - 56
Copyright
Copyright © Royal Aeronautical Society 1967

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References

1.Rajaratnam, N.A Note on the Static Hole Error Problem. J. Roy. Aero. Soc, Vol. 70, p 370, 1966.CrossRefGoogle Scholar
2.Shaw, R.The Influence of the Hole Dimensions on Static Pressure Measurements. J Fl Mech, Vol. 7, Pt. 4, 1960.CrossRefGoogle Scholar
3.Duffy, J. and Norbury, J. F. The Measurement of Skin Friction in Favourable Pressure Gradients Using Wall Static Holes and Preston Tubes. (To be published.)Google Scholar
4.Bradshaw, P.Wind Tunnel Screens: Flow Instability and Its Effect on Aerofoil Boundary Layers. .J. Roy. Aero. Soc., Vol. 68, p 198, 1964.CrossRefGoogle Scholar
5.Head, M. R. and Rechenberg, I.The Preston Tube as a Means of Measuring Skin Friction. Journal of Fluid Mechanics, Vol. 14, p 1, 1962.Google Scholar