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Pressure Distributions and Forces on Rectangular and D-shaped Cylinders

Published online by Cambridge University Press:  07 June 2016

B R Bostock  and
W A Mair
B R Bostock
Affiliation:
Engineering Department, Cambridge University
W A Mair
Affiliation:
Engineering Department, Cambridge University
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Summary

Measurements in two-dimensional flow on rectangular cylinders confirm earlier work of Nakaguchi et al in showing a maximum drag coefficient when the height h of the section (normal to the stream) is about 1.5 times the width d. Reattachment on the sides of the cylinder occurs only for h/d < 0.35.

For cylinders of D-shaped section (Fig 1) the pressure distribution on the curved surface and the drag are considerably affected by the state of the boundary layer at separation, as for a circular cylinder. The lift is positive when the separation is turbulent and negative when it is laminar. It is found that simple empirical expressions for base pressure or drag, based on known values for the constituent half-bodies, are in general not satisfactory.

Information

Type
Research Article
Information
Aeronautical Quarterly , Volume 23 , Issue 1 , February 1972 , pp. 1 - 6
Copyright
Copyright © Royal Aeronautical Society. 1972

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References

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