Abstract: Results are presented from an experimental investigation of the behavior of a two-dimensional random frequency generator. Typical flow fields obtained from tdifferent venturi contours are examined. Characteristics of the shock oscillation under certain operating conditions are described. The boundary condition at the exit section can be either sonic flow or constant pressure. While this boundary condition has been known to have major influence on the oscillation characteristics of the shock wave and extent of the flow separation, its effect on the flow field at exit is surprisingly negligible. Shaping screens which are often used in such generators to produce desired total pressure contours can drastically reduce turbulence intensity at the exit. This undesirable effect can be avoided by using a simulator plate instead.