Second Symposium on Turbulence and Shear Flow Phenomena
DOI: 10.1615/TSFP2
SHOCK MOTION AND STATE OF TURBULENCE IN A PERTURBED FLOW OVER A SPHERE, AT SUPERSONIC SPEED
pages 335-339
DOI: 10.1615/TSFP2.1300
ABSTRAKT
A flow at M=2.29 around a sphere, perturbed by a horizontal sonic jet placed on its axis of symmetry is explored experimentally by visualizations and wall pressure measurements. The motion of the resulting shock in connection with the laminar or turbulent state of the boundary layer is considered. It is found that, for some jet pressure, the shock system produced ahead of the sphere becomes unsteady; correlatively, strong pressure fluctuations are measured at the sphere surface. It is shown that jets located at other places are less efficient to produce shock unsteadiness, and that a jet at a Mach number close to 2 produces the same qualitative behaviour.