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The Speed of Sound and Mach Number Effects

Published online by Cambridge University Press:  04 July 2016

S. L. Bragg  and
S. F. Smith
S. L. Bragg
Affiliation:
Rolls-Royce Ltd.
S. F. Smith
Affiliation:
Rolls-Royce Ltd.
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Extract

In most aerodynamic problems the speed of sound, a, is naturally taken as or where p, ρ and T are static values, γ is the specific heat ratio and R is the gas constant. This particular speed, however, is specifically that of plane waves advancing uniformly into an infinite expanse of a homogeneous medium. There are many other situations where the medium is bounded or inhomogeneous, for instance, in which small pressure waves do not propagate at this speed relative to the medium. Phenomena such as choking can then be shown to occur, not when the flow velocity is exactly equal to but when it reaches the new wave speed appropriate to the local circumstances.

Type
Technical Notes
Information
The Aeronautical Journal , Volume 67 , Issue 634 , October 1963 , pp. 669 - 670
Copyright
Copyright © Royal Aeronautical Society 1963

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References

1.Pearson, H., Holliday, J. B. and Smith, S. F.Journal of the Royal Aeronautical Society, 62, 746, 1958.Google Scholar
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3.Pearson, H.Journal of the Royal Aeronautical Society, 67, 64, 1963.Google Scholar
4.Rayleigh, Lord. Theory of Sound, 2nd Ed., para 339, MacMillan, 1929.Google Scholar
5.Tyler, J. M. and Sofrin, T. G. S.A.E., Paper 345 D, 1961.Google Scholar