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A Note on the Effect of Surface Finish on the Thrust of a Supersonic Conical Nozzle

Published online by Cambridge University Press:  04 July 2016

P. N. Rowe
P. N. Rowe*
Affiliation:
(Formerly High Speed Fluid Kinetics Laboratory, Department of Chemical Engineering, Imperial College, now Chemical Engineering Division, A.E.R.E., Harwell.)
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Extract

The Propelling Nozzles tested are turned from brass and the interior surface finish shows a centre line average of about 15 micro inches when examined on a Taylor Hobson machine. This is fairly rough compared with the estimated boundary layer thickness and it was required to know whether this in fact affected the thrust. The thrust of a nozzle manufactured by the usual process was measured before and after a polishing process. An improvement of one half per cent was recorded.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 62 , Issue 575 , November 1958 , pp. 829
Copyright
Copyright © Royal Aeronautical Society 1958

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References

1.Fraser, R. P., Rowe, P. N. and Coulter, M. O. (1957). The Efficiency of Supersonic Nozzles for Rockets and Some Unusual Designs. Proceedings of the Institution of Mechanical Engineers, 171, p. 553, 1957.Google Scholar
2.Rowe, P. N. (1957). A Balance Method of Measuring the Thrust Reaction of an Air Jet. M.O.S. Report J.R.L. 38, October 1957.Google Scholar