Study of the influence of instability wave scattering on the efficiency of jet noise shielding within the geometric theory of diffraction

TL;DR

This study develops a theoretical model using the Geometrical Theory of Diffraction to analyze how instability wave scattering affects jet noise shielding efficiency near a rigid screen, aligning well with experimental results.

Contribution

The paper introduces a GTD-based model that incorporates scattering of hydrodynamic fluctuations and diffraction of acoustic waves, advancing understanding of jet noise shielding mechanisms.

Findings

Model accurately predicts low-frequency noise amplification.

Model captures high-frequency noise reduction.

Results agree with experimental data for jet-plate configurations.

Abstract

The paper presents the results of a theoretical study of the noise shielding effect of a subsonic turbulent jet located near a rigid screen. The developed theoretical model, based on the methods of the Geometrical Theory of Diffraction (GTD), takes into account the effects of scattering of the hydrodynamic fluctuations of the jet near field at the edges of the screen and diffraction of acoustic perturbations generated by small-scale turbulence. Small-scale turbulent noise radiating pulsations are described within the framework of the correlation theory of jet noise in the form of compact quadrupole sources distributed along the jet axis. Hydrodynamic near-field fluctuations are approximated as a superposition of Kelvin-Helmholtz instability wave packets of different azimuthal numbers. Typical parameters of both types of fluctuations are adjusted using experimental data on the near and far fields of a free jet issuing from a profiled nozzle with a diameter of 0.04 m at a velocity of 181 m/s. The result of the jet noise shielding efficiency calculation, using the developed model, is in good agreement with the experimental data obtained for the jet-plate configuration, including correct reproduction of the low-frequency noise amplification (jet-plate installation noise) and the effect of high-frequency noise decrease (shielding itself).