ACOUSTIC ATTENUATION PERFORMANCE OF CIRCULAR EXPANSION CHAMBERS WITH SINGLE-INLET AND DOUBLE-OUTLET

✍ Scribed by A. SELAMET; Z.L. JI

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 240 KB
• Volume: 229
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.1999.2328

✦ Synopsis

Expansion chambers with single-inlet and double-outlet provide desirable broadband acoustic attenuation similar to simple (single inlet/outlet) chambers and reduce the #ow noise and back pressure in exhaust systems. The present study develops a three-dimensional analytical approach to determine the transmission loss of circular expansion chambers with single-inlet and double-outlet, which couples the continuity conditions of the acoustic pressure and particle velocity at the inlet and outlets with the orthogonality relations of Fourier}Bessel functions. The analytical results are compared with the boundary element predictions. The acoustic attenuation of the expansion chambers with single-inlet and double-outlet is then investigated in detail as a function of the chamber length and the locations of inlet and outlets.