The paper presents the results of a computational–experimental study of jet noise reduction using the screening effect. According to correlation theory, the noise sources of a single circular jet are represented by a set of uncorrelated quadrupoles. Using the basic relations of geometric diffraction theory (GDT), expressions are obtained for the sound field emitted by a point quadrupole source located near an acoustically rigid infinite half-plane. Using the expressions obtained in the framework of the GDT, the correlation model of the jet noise sources was adapted to the calculation of the sound field in the presence of a flat rectangular screen. A comparison of the calculated and experimentally measured spectra of sound pressure levels, performed at a given jet velocity and various screen positions, showed good qualitative, and for certain observation angles, quantitative agreement.

本文介绍了利用屏蔽效应进行的喷气降噪的计算机实验研究结果。根据相关理论，单个圆形射流的噪声源由一组不相关的四极杆表示。使用几何衍射理论（GDT）的基本关系，获得了位于声刚性无限半平面附近的点四极子源发出的声场的表达式。使用在GDT框架中获得的表达式，将射流噪声源的相关模型改编为在存在扁平矩形屏幕的情况下进行声场的计算。在给定的射流速度和不同的屏幕位置下，对声压级的计算谱和实验测量谱进行的比较显示出良好的定性，