Radiation of acoustic waves by a partially lined pipe with an interior perforated screen

• Published in: Journal of engineering mathematics Vol. 122; no. 1; pp. 17 - 29
• Main Author: Tiryakioglu, Burhan
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.06.2020; Springer Nature B.V
• Subjects: Acoustic noise; Acoustic waves; Aircraft engines; Applications of Mathematics; Automotive engines; Boundary conditions; Computational Mathematics and Numerical Analysis; Far fields; Linear algebra; Mathematical and Computational Engineering; Mathematical Modeling and Industrial Mathematics; Mathematics; Mathematics and Statistics; Noise reduction; Pipes; Theoretical and Applied Mechanics; Turbofan engines; Wave equations; Wiener Hopf equations; Pipe; Perforated screen; Mode matching; Wiener–Hopf; Acoustic wave
• ISSN: 0022-0833; 1573-2703
• DOI: 10.1007/s10665-020-10042-x

The paper presents analytical and numerical results of radiation phenomena at the far field and solution of the acoustic wave equation with boundary conditions imposed by the pipe wall. A semi-infinite pipe with partial lining and interior perforated screen is considered. The study is important because of its applications in noise reduction in exhausts of automobile engines, in modern aircraft jet and turbofan engines. This problem is described by a Wiener–Hopf equation and then solved numerically. The solution involves three infinite sets of coefficients satisfying three infinite systems of linear algebraic equations. Numerical solutions of these systems are obtained for various values of the parameters of the problem and their effects on the radiation phenomenon are shown graphically.