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213092 results in Engineering

Page 2012 of 10655

  • Abstracts of Patent Specifications

  • Journal:
    The Aeronautical Journal / Volume 37 / Issue 274 / October 1933
    Published online by Cambridge University Press:
    28 July 2016, pp. 900-908
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  • AER volume 56 issue 494 Cover and Front matter

  • Journal:
    The Aeronautical Journal / Volume 56 / Issue 494 / February 1952
    Published online by Cambridge University Press:
    28 July 2016, p. f1
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  • Correspondence

  • G. Jessop
  • Journal:
    The Aeronautical Journal / Volume 41 / Issue 313 / January 1937
    Published online by Cambridge University Press:
    28 July 2016, p. 66
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  • AER volume 51 issue 444 Cover and Front matter

  • Journal:
    The Aeronautical Journal / Volume 51 / Issue 444 / December 1947
    Published online by Cambridge University Press:
    28 July 2016, pp. f1-f20
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  • On the Noise from Supersonic Jets*

  • E. J. Richards
  • Journal:
    The Aeronautical Journal / Volume 61 / Issue 553 / January 1957
    Published online by Cambridge University Press:
    28 July 2016, pp. 43-45

  • 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.

  • A New Concept in the Design of Jet Engine Mufflers and Test Cells

  • E. J. Richards, D. J. Evans
  • Journal:
    The Aeronautical Journal / Volume 61 / Issue 561 / September 1957
    Published online by Cambridge University Press:
    28 July 2016, pp. 619-630

  • A new concept is put forward which should help materially in the design of engine test cells and ground mufflers. It is suggested that a relatively small spreader can be added behind a jet nozzle which changes, the shape of the jet from circular to a long annular slot. The frequency rise which may be obtained in this way is used to reduce low frequency noise, possibly at the expense of more easily attenuated high frequency noise. As a modest example, tests are described on one particular version which gives an attenuation in the most important low frequency range of nearly 20 decibels. It is shown that the back pressure on the engine is negligible even with a cooling flow equal to the engine mass flow. Other applications are discussed and tested, while suggestions for full scale installations are made.

  • Metal Construction

  • Dermot J. Mooney
  • Journal:
    The Aeronautical Journal / Volume 38 / Issue 277 / January 1934
    Published online by Cambridge University Press:
    28 July 2016, pp. 68-69
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  • Fuels for Aircraft Engines

  • E. L. Bass
  • Journal:
    The Aeronautical Journal / Volume 39 / Issue 298 / October 1935
    Published online by Cambridge University Press:
    28 July 2016, pp. 879-962

  • It is unnecessary to enlarge on the importance of the fuels used in aviation in a paper before this Society. Not only is fuel quality the most important individual factor to be considered in the economics of civil aviation, but engine development, aircraft design and performance depend upon it.

    An apology is offered, in view of the title of the paper, that as it is barely possible in the confines of a single paper to deal adequately with the volatile fuels (known as petrols and gasolines) used in the normal carburettor or homogeneous charge engines, other types of fuels have necessarily been omitted.

Page 2012 of 10655