Similarity criteria for the spectra of wall pressure fluctuations in a turbulent boundary layer

Experimental data on the spectra of wall pressure fluctuations in a turbulent boundary layer are presented in order to establish a generalized law governing wall pressure for determining aerodynamic parameters in wind tunnel tests. The wall pressure fluctuation spectra are presented over a wide range of Mach numbers (M = 0.015-4), Reynolds numbers (Re = 600 to 150,000), and Strouhal numbers (S = 0.2 to 1000) which are determined by means of a unified measurement procedure and a system of sensors with high spatial resolution. It is found that the calculations of pressure fluctuations in the audio frequency range are in good agreement with measurements of pressure fluctuations on the surface of a passenger aircraft fuselage in a wind tunnel test.