Abstract
The flow downstream of a nozzle was disturbed by a ring of delta wings arranged so that their trailing vortices were approximately in the centre-line of the mixing layer that springs from the jet exit. This flow was considered somewhat similar to that from a noisesuppressing nozzle fitted with teeth. The mean flow and the turbulent velocities have been measured over the important noise-producing regions of a subsonic jet with and without the delta wings. In order to be able to draw conclusions about the differences in the noise generated from these two flows, the properties of the fluctuating turbulent stresses were also measured. Significant reductions were observed in the magnitude of the one fluctuating turbulent stress measured and its integral length scales with the delta wings present. The measured reduction in noise from the nozzle fitted with delta wings was attributed to these changes.
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