On velocity of sound and transition to turbulence

It is shown that some zones of acoustic conductivity appear in centre of canal and near to the wall, when Reynolds numbers correspond to transition to turbulence. The sound velocity in the zones is higher than adiabatic value. Acoustic disturbances propagate in these conductivity zones with higher velocity. It leads to appearance of transverse pressure gradients in the canal and symmetric vortex structures. The results of computing and physical experiments are presented.