| Abstract: | The cross-correlated power spectrum of wall pressure fluctuations and the derivative of the turbulent velocity component normal to the wall is measured at a longitudinal coordinate; this spectrum, along with the mean shear, determines the contribution of the mean-shear-turbulence interaction to pressure fluctuations at a wall under a turbulent boundary layer. The spectrum is used to calculate the power spectrum and the transverse cross-correlated power spectrum of pressure fluctuations at the wall. Comparison of calculated and directly measured pressure spectra indicates that wall pressure fluctuations are almost completely determined by the mean-shear-turbulence interaction.Translated from Izvestiya Akademii Nauk SSSR, Mekhanika Zhidkosti i Gaza, No. 4, pp. 28–34, July–August, 1976.The author thanks G. P. Morozov-Rostovskii and Yu. A. Konokhov for fabricating a miniature hot-wire anemometer and help in carrying out the experiment. |
