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Volume 69 - August 1965

Contents

Page 12 of 15

Reviews

Library

The Library

Other

Reviews

Library

Research Article

  • A Correlation for the Effect of Control Deflection upon Pitching Moment

  • J. C. Gibbings
  • Published online by Cambridge University Press:
    04 July 2016, pp. 793-794

  • The rate of change of the pitching moment coefficient upon an aerofoil with respect to the deflection of a flap control—a quantity denoted by m2—is of interest in its effect upon the torsional twisting of an aerofoil and hence upon the wing reversal phenomenon. The value of m2 is very susceptible both to small aerofoil profile modifications and to boundary layer conditions. As a result this quantity is not very amenable to attempts to correlate experimental values and this is particularly so for the small values of the control chord that are typical of control tabs.

Reviews

Library

Other

Research Article

  • The Dependence of Diffuser Performance upon Inlet Flow Conditions

  • J. L. Livesey, J.T. Turner
  • Published online by Cambridge University Press:
    04 July 2016, pp. 794-795

  • It was recently stated by Cockrell, Diamond and Jones(1) that attempts to correlate diffuser loss coefficients with the inlet boundary layer momentum thickness were generally unsatisfactory. In particular, it had proved impossible to align various results from diffuser tests which had been made with differing inlet flow conditions. The two methods of thickening the diffuser inlet boundary layer, using either

    (a) a length of parallel pipe, or

    (b) screen rings at inlet to the diffuser

    led to a corresponding variation in diffuser performance.

    The conclusion was drawn that “the manner by which an inlet boundary layer has been thickened is as significant in determining diffuser performance as is the thickness of the layer. No satisfactory inlet flow parameter is at present known”.

Other

Reviews

Library

Other

Reviews

The Library

Library

Page 12 of 15