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Abstract

In this work a model for fine-scale turbulent noise predictions from non-axisymmetric, heated and unheated jets is developed. This model, called GENO, improves upon the previous noise prediction methods JeNo and MGBK by including the effects of mean flow refraction from non-circular geometry, as well as a more complete model for the self, shear, and enthalpy noise sources. The Green's function for non-axisymmetric flows is determined by solving the Lilley-Goldstein equation in terms of coupled azimuthal modes. Additionally, the noise source model evaluates the fourth order velocity correlation tensor I_ijkl for the general case and the relationship between non-zero components is found. This is combined with an empirical noise source model for heated jets. Acoustic results using GENO are shown for aspect ratio 2:1 and 4:1 rectangular jets, under unheated (SP7) and heated (SP46) conditions, and the comparisons agree favorably with experimental data.

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Fine-Scale Turbulent Noise Predictions from Non-Axisymmetric Jets

Abstract

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