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On the Noise from Supersonic Jets*

Published online by Cambridge University Press:  28 July 2016

E. J. Richards
E. J. Richards*
Affiliation:
University of Southampton
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Extract

In parallel with the work undertaken at the University of Southampton on the study of the noise from subsonic jets, a further investigation has been made into the noise from supersonic or choked jets. Whereas in the former case the noise is due to the turbulent velocity fluctuations and thus contains a wide spectrum of random frequencies, the latter case contains, in addition to this wide spectrum, noise caused by turbulence-shock wave inter-action.

Once the critical pressure ratio of a jet has been attained, i.e. that pressure ratio which produces sonic or supersonic flow in the jet pipe just before the orifice, the structure of the jet depends crucially upon the nozzle shape.

Information

Type
Research Article
Information
The Aeronautical Journal , Volume 61 , Issue 553 , January 1957, pp. 43 - 45
Copyright
Copyright © Royal Aeronautical Society 1957

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Footnotes

*

This paper was read at the Second International Congress on Acoustics, at Cambridge, Mass., in July 1956.

References

1. Powell, A. (1952). On the Mechanism and Reduction of Choked Jet Noise. Part 1. A.R.C. 15 623, F.M. 1858, December 1952.Google Scholar
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6. Powell, A. (1955). A Note on the Sound from Weak Disturbances of a normal Shock Wave. A.R.C, C.P. 194, 1955.Google Scholar