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On the acoustic radiation from boundary layers and jets

Liepmann, H. W. (1954) On the acoustic radiation from boundary layers and jets. California Institute of Technology , Pasadena, CA. (Unpublished)

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In the following a general discussion of aerodynamically created sound is given. The study is essentially theoretical in nature, but arrives at a description of the physical phenomena in such a fashion as to yield an immediate access to experiments. First, the problem of aerodynamic noise is defined and two simple mechanical analogues discussed. Then, the general equations of motion of a viscous, compressible fluid are rearranged in a form suitable for a comparison with Lighthill's approach. However, this approach is not being followed through. Instead, the concept of induced velocities due to displacement effects is put forward and carried through for noise produced by boundary layer flow. The same concept is then extended to describe the sound field created by a jet.

Item Type:Report or Paper (Technical Report)
Additional Information:Submitted to the National Advisory Committee for Aeronautics in Partial Fulfillment of Contract NAw-6288. This study was sponsored by the National Advisory Committee for Aeronautics. The author gratefully acknowledges the help of Drs. P.A. Lagerstrom and J.D. Cole. Guggenheim Aeronautical Laboratory, California Institute Of Technology, Pasadena, California, August, 1954. GALCIT report No. 79
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National Advisory Committee for AeronauticsNAw-6288
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Other Numbering System NameOther Numbering System ID
GALCIT Report79
Record Number:CaltechAUTHORS:LIEgalcit54
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:12113
Deposited By: Archive Administrator
Deposited On:23 Oct 2008 23:07
Last Modified:03 Oct 2019 00:25

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