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Research on Channel Wall Interference*

Published online by Cambridge University Press:  28 July 2016

J. H. Parkin
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Summary

An investigation of channel wall interference with the object of verifying experimentally the accuracy of the results given by the theory developed by Prandtl and extended by Glauert. Tests were made, with cylinders and aerofoils, using the “ mirror ” method, for some ten different channel sizes. The results show :

  1. 1. The presence of the channel walls results in an increase in the drag of a symmetrical body, such as a cylinder.

  2. 2. Agreement with the theoretial corrections for incidence and drag for channels of reasonable size.

  3. 3. The extent and nature of the wall interference effects on the aerodynamic characteristics of aerofoils in much restricted streams, beyond the limits of applicability of the theory.

Type
Research Article
Information
The Aeronautical Journal , Volume 31 , Issue 204 , December 1927 , pp. 1110 - 1149
Copyright
Copyright © Royal Aeronautical Society 1927

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Footnotes

*

Aeronautical Research Paper, No. 17 (Canada).

References

Note on page 1110 † Atmospheric pressure channels only are here considered.

Note on page 1117 * A list of symbols is given at the end of the report.

Note on page 1123 * For a description of the channel and apparatus, see Aeronautical Research Paper No. 16.

Note on page 1141 * The aerofoil here used is of the same section as that used previously for a research on thick aerofoils (see Aeronautical Research Paper No. 8, September, 1921). The models in this earlier research were of wood and were tested in the old 4ft. N.P.L. type wind channel at Toronto. The models in the present research are of metal, and tested in the new R.A.K. type channel, some four years later, by entirely different observers. Yet the agreement between the coefficients given in the earlier report and those here given for similar conditions, 40 f.p.s. and 4 by 4 channel, will be found, on comparison, to be surprisingly good. This affords some indication of the accuracy of the models used and the reliability of the observations.