A series of experiments in the interaction and self-action of intense acoustic wave beams is described. The experimental technique used makes it possible to investigate the propagation of beams at large acoustic Reynolds numbers with high spatial and frequency resolution. The degenerate parametric interaction of intense acoustic beams is considered, the nonlinear amplification of a weak signal on a subharmonic is considered, and the evolution of noise quasimonochromatic beams at large Reynolds numbers is studied.
$^1$Federal State Budgetary Scientific Institution "Federal Research Center The Institute of Applied Physics of the Russian Academy of Sciences" (IAP RAS)\
$^2$N.I. Lobachevsky Nizhny Novgorod State University
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