A comparison between the performance of different silencer designs for gas turbine exhaust systems

Ray Kirby , Paul Williams , James Hill

The dissipative silencers used to attenuate noise emanating from air moving devices such as fans are normally of a simple splitter design, with parallel baffles of absorbent material arranged over the width of a duct. However in more specialist applications, such as the exhaust systems of gas turbines, different silencer geometries are often used. One such geometry is a so-called bar silencer, in which rectangular bars, or bricks, of absorbing material are placed in a lattice arrangement over the duct cross section. The acoustic performance of these bar silencers is investigated here using a finite element based numerical mode matching scheme. The insertion loss of the bar silencers is then calculated and compared against traditional splitter designs in order to investigate the relative efficiency of each design.

Keywords: Exhaust silencers; Gas turbines

Domains: Acoustics [physics.class-ph]

Ray Kirby, Paul Williams, James Hill. A comparison between the performance of different silencer designs for gas turbine exhaust systems. Acoustics 2012, Apr 2012, Nantes, France. ⟨hal-00811106⟩