Suppression of large-scale structures in a gas-saturated impact jet

The suppression of large-scale vortex formations under gas-saturation condi tions is detected on the basis of measurements of the pulsation component o f the surface friction when an axisymmetric hot jet of a fluid impinges on an obstacle. The conditions for the resonant enhancement of coherent struct ures and the suppression of broad-band turbulence are determined for single -phase and gas-saturated impact jets. The evolution of various pulsation co mponents in the gradient region of an impact jet is analyzed. (C) 1999 Amer ican Institute of Physics. [S1063-7850(99)01505-0].