Abstract
In the modeling of the noise sources in turbulent jets two open questions are still remain. The first, what is the multipole type of the sources? The second, what kind of stochastic fields can be used for the noise source description. These issues are analyzed in this work. Two-point cross-correlation of the jet noise is used to determine the multipole type of sources. Modeling of the cross-correlation provides clear evidence in favor of the quadrupole type of the jet noise sources. In the context of the second issue the recently developed two-stage correlation model is tested on the basis of measurements of azimuthally decomposed jet noise. The results show a promising agreement in a wide range of parameters.
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