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Volume 67 - December 1963

Contents

Page 11 of 14

Technical Notes

  • Lift Produced by a Sonic Boom

  • A. Sigalla
  • Published online by Cambridge University Press:
    04 July 2016, p. 796

  • The Technical Note by C. H. E. Warren in the September Journal raises a question on the transfer of lift, of an aeroplane in supersonic flight, to the ground. This problem was considered in reference 2. It was shown that, as expected, the resultant of the pressure field produced by the aeroplane is equal to its lift. This apparent inconsistency with the N-wave pattern, predicted by Whitham stems from the fact that most applications of Whitham's theory are based on asymptotic forms for the velocity perturbations. Thus, the formula for the axial velocity perturbation is obtained by allowing (M2— l)l/2r/y to tend to infinity, where M is the flight Mach number, r the radial distance away from the aeroplane, y=x—(M2 — l)1/2, and x is the distance along the aeroplane flight direction. This approximation is valid in the vicinity of the shock waves emanating from the aeroplane.

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Library

The Library

Other

Reviews

The Library

Library

The Library

Technical Notes

  • The Speed of Sound and Mach Number Effects

  • B. S. Stratford
  • Published online by Cambridge University Press:
    04 July 2016, p. 797

  • In the October edition of the Journal Bragg and Smith contribute a stimulating article suggesting that in several examples of confined or two-dimensional flow pressure waves have a special velocity of propagation that is not equal to , the wave velocity in an infinite unbounded medium. Moreover phenomena such as choking can be said to occur at the special wave speed appropriate to the particular circumstances, so that it might appear sensible when describing the flow to use a Mach number based on the special wave propagation velocity rather than on They invite comments on this suggestion.

Reviews

The Library

Other

Reviews

The Library

Technical Notes

Front matter

  • AER volume 67 issue 626 Cover and Front matter

  • Published online by Cambridge University Press:
    04 July 2016, pp. f1-f2
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Page 11 of 14