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The Structural Aspects of Jet Noise

Published online by Cambridge University Press:  28 July 2016

M. O. W. Wolfe
M. O. W. Wolfe*
Affiliation:
Structures Department, R.A.E.
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Extract

The increase in jet engine thrust has been accompanied by an increase in the noise generated by the jet stream to such an extent that the associated noise pressures are now capable of exciting vibrations in an aircraft structure which are potentially dangerous from the fatigue aspect. Several examples of fatigue damage of this kind have appeared already on aircraft in this country and in the United States.

The noise generated by a gaseous jet arises principally from disturbances caused by high velocity gradients at the jet boundary. Classical theoretical work on noise generated in this way has been done by Professor Lighthill. He introduced the concept of an “acoustic quadropole” as the elementary sound generator, and showed mathematically that the total acoustical power radiated by a jet varies directly as the eighth power of the jet exit velocity and the second power of the jet exit diameter.

Type
Jet Efflux - A Symposium
Information
The Aeronautical Journal , Volume 61 , Issue 554 , February 1957 , pp. 103 - 106
Copyright
Copyright © Royal Aeronautical Society 1957

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References

1. Lighthill, M. J. On Sound Generated Aerodynamically: I General Theory. Proceedings of the Royal Society, Ser. A. Vol. 211, 1952, pp. 564–587.Google Scholar
2. Lighthill, M. J. On Sound Generated Aerodynamically: II Turbulence as a Source of Sound. Proceedings of the Royal Society, Vol. 222, 1954, pp. 1–32 Google Scholar