Abstract
A verification of some of the predictions of the theory of Phillips (1955) is presented, and the relation between one-dimensional and two-dimensional wavenumber spectra is discussed. The convection velocity of the irrotational field deduced from measurements of the frequency spectrum alone appears to be about 0.9U1in the frequency range carrying most of the energy. It follows that the pressure-fluctuation spectrum is proportional to the velocity-fluctuation spectrum and varies as ω2at low frequency. The discrepancy between this result and measurements of wall-pressure spectra is plausibly attributed to extraneous sound.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Reference28 articles.
1. Liepmann, H. W. 1962 Mécanique de la turbulence, Marseilles , 1961,Colloques Internat. du C.N.R.S. (Paris).
2. Wooldridge, C. E. & Willmarth, W. W. 1962 Univ. of Michigan,ORA Rep. no. 02920.
3. Jeffreys, H. & Jeffreys, B. S. 1956 Methods of Mathematical Physics .Cambridge University Press.
4. Phillips, O. M. 1955 Proc. Camb. Phil. Soc. 51,220.
5. Wills, J. A. B. 1965 Private communication.
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