Publicou 6 edições por ano
ISSN Imprimir: 1948-2590
ISSN On-line: 1948-2604
DEVELOPMENT OF A MEASURING TECHNIQUE FOR THE LOW-WAVENUMBER COMPONENTS OF THE WAVENUMBER-FREQUENCY SPECTRUM OF TURBULENT WALL PRESSURE FLUCTUATIONS
RESUMO
The main sources of errors impeding measurement of the wavenumber-frequency spectrum of wall pressure fluctuations of turbulent boundary layers in low-wavenumber regions are analyzed. Such measurements are necessary for the calculation of fuselage skin vibrations related to its inertial excitation, and for the evaluation of noise levels in the cabin caused by these vibrations. The evaluations and the dependencies of flow parameters and the measuring system are obtained for each source of error. Based on models of the wavenumber-frequency spectrum, the author validates the applicability range of different antennas and develops an optimization method of arranging the pressure sensors which enables accurate measurements using the minimum number of transducers both for one- and two-dimensional cases.
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