Abstract (Invited)

Sound and Pseudosound Generation in Turbulent Boundary Layer

S.A.Rybak (N.N. Andreyev Acoustics Institute, Moscow, Russia)

e-mail: rybak@akin.ru

Pressure fluctuations that occure in a turbulent boundary layer (TBL)as a result of the nonlinear interactions between the eddy field components are the object of many theoretical and experimental studies.At the same time,the mechanism of the linear transformation of vortex waves to longitudinal ones on a rigid or elastic wall in TBL is rather poorly understood.This report continues our previous study (K.A.Naugolnykh and S.A.Rybak.Tr.Akust.Inst.AN SSSR.No.16.129(1971).Sov.Phys.Acoust.26.502(1980).S.A.Rybak.Acoust.Phys.V.47.No.5.629-631.(2001).The last paper contains the formulae,which connects directly the shear stresses on the wall with potential waves pulsations.There is an important experimental confirmation of our results: B.M.Efimtsov and V.A.Sysoev.Acoust.Phys.43.307.(1997).

Section : 7