The Structure of Turbulent Flow over Regularly Arrayed Rough Surfaces : Wind Tunnel Experiment

概要

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The results obtained in the present experiments are summarized as follows: 1) Nondimensional energy spectra vary with x gradually in the developing stage of turbulence, that is, (i) the value of spectrum G(n) at the peak frequency f_<max> decreases with x, (ii) the values of spectrum in both lower and higher frequency regions. increase with x, but do not in the fully developed one and tend to take an invariable shape. 2) The effect of the first strip remains to the wide streamwise region even in the case of regularly arrayed strips. 3) The shape of the generalized energy spectrum of u component of turbulence in the fully developed region in the wind tunnel is similar to that of w component in the atmosphere. 4) Kolmogorov constant cannot be definitely determined from the present experiment, although an average value of 0.55 is estimated. Further study about this problem will be necessary.
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