The use of distributed pressure receivers based on elastic piezoelectric composite materials for measuring the hydrodynamic noise produced by a near-wall turbulence

Receiving electroacoustic transducers with sensing elements made of an elas tic piezoelectric composite material are described. The parameters of a com posite material that exhibits a bulk piezoelectric effect are presented. Re sults obtained by measuring the turbulent noise in a hydrodynamic channel w ith the use of piezoelectric composite receivers are reported. The results are compared with those of the noise measurements by a miniature piezoceram ic receiver and are considered in the light of the known models of near-wal l turbulence. (C) 2001 MAIK "Nauka/Interperiodica".