Turbulent acoustic streaming excited by resonant gas oscillation with periodic shock waves in a closed tube

摘要

Resonant gas oscillations with periodic shock waves in a closed tube are studied by executing large-scale computations of the compressible 2-D Navier–Stokes equations with a finite-difference method. In a quasisteady state of oscillation, acoustic streaming (mean mass flow) of large Rs is excited, where Rs is the streaming Reynolds number based on a characteristic streaming velocity, the tube length, and the kinematic viscosity. When Rs=560, relatively strong vortices are localized near the tube wall. The resulting streaming pattern is almost stationary but quite different from that of the Rayleigh streaming. The streaming of Rs=6200 involves unsteady vortices in a region near the center of the tube. Turbulent streaming appears in the result of Rs=56000, where vortices of various scales are irregularly generated throughout the tube. ©1999 Acoustical Society of America.