An investigation of the near noise fields of a choked axisymmetric air jet

Abstract

An experimental investigation was completed of the near sound field of a choked axisymmetric air jet of 2.25-in diameter. The results include surveys of tbe sound pres sure levels in the area surrounding the jet and the identification of various screech frequencies. A schlieren system with stroboscopic spark synchronisation was used to photograph an axisymmetric mode and a spiralling mode of the jet oscillations.