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Laminar Boundary Layers over Permeable Curved Surfaces

Published online by Cambridge University Press:  07 June 2016

B. R. Clayton  and
B. S. Massey
B. R. Clayton
Affiliation:
Department of Mechanical Engineering, University College London
B. S. Massey
Affiliation:
Department of Mechanical Engineering, University College London
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Summary

Steady, constant-density, two-dimensional flow in a laminar boundary layer is considered over a permeable curved surface, for conditions such that the equation of motion has similar solutions. Account is also taken of the displacement of the main stream by the boundary layer.

Integration of the equation of motion on a digital computer yields results indicating that, for given values of curvature and longitudinal pressure gradient, suction reduces the boundary-layer thickness and increases skin friction. Blowing has the reverse effects. The amount of suction or blowing required to produce neutral stability is independent of curvature and so may be deduced from data for flat surfaces.

For a given curvature, blowing reduces, whereas suction increases, the magnitude of the adverse pressure gradient which the boundary layer can withstand before separation occurs. For a surface through which there is blowing or only a small amount of suction, convex curvature also reduces the magnitude of the adverse pressure gradient producing separation; but for larger amounts of suction the effect of surface curvature on separation is reversed.

Type
Research Article
Information
Aeronautical Quarterly , Volume 20 , Issue 3 , August 1969 , pp. 259 - 280
Copyright
Copyright © Royal Aeronautical Society. 1969

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References

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