Abstract
It is well known that sources of jet noise are described by a variety of models; thus there is no unique source distribution. If no assumptions are made about the nature of the sources, then one can infer virtual source distributions from certain farfield measurements. Here, however, the source locations are deduced directly from acoustic intensity measurements near an axisymmetric jet flow. The magnitude and direction of the acoustic intensity vector are found to be functions of position and source frequency. Acoustic intensity is measured along three directions in a plane of the jet axis; data are analyzed in 1/3 octave bands. The measurements are performed sufficiently far from the jet flow to avoid air flow over the probe. Clearly, the resolution of the source location scheme suffers with increasing probe-source separation: Thus a compromise is struck. The measured data permit the reconstruction of certain properties of the acoustic farfield and appear to demonstrate closure. [Work funded by Natural Sciences and Engineering Research Council of Canada.]
Published Version
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