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An Investigation of the Swirl in an S-Duct

Published online by Cambridge University Press:  07 June 2016

R.W. Guo  and
J. Seddon
R.W. Guo
Affiliation:
Department of Aeronautical Engineering, Bristol University; on sabbatical from Nanking Aeronautical Institute, China
J. Seddon
Affiliation:
Consultant to Department of Aeronautical Engineering, Bristol University
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Summary

Measurements are presented of the static pressure, total pressure, swirl and three-dimensional turbulence in the flow through an S-curved rectangular duct mounted in a wind tunnel at different incidences, yaw angles and mass flow ratios. The results show that at high incidence there is a large vortex around an area of flow separation after the first bend and a pair of contra-rotating vortices in the flow after the second bend. The distortion of total pressure at the exit of the S-duct is significantly high, and the corresponding three-dimensional turbulence is up to 16.7%. Appreciation of the existence of this type of flow is important in the field of air intake design for jet aircraft.

Type
Research Article
Information
Aeronautical Quarterly , Volume 33 , Issue 1 , February 1982 , pp. 25 - 58
Copyright
Copyright © Royal Aeronautical Society. 1982

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References

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