8.8 COMMERCIAL SILENCERS

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Commercial silencers generally use designs that combine features from

basic side-branch, expansion chamber, and dissipative silencers. One

example of an industrial silencer is shown in Fig. 8-19. The silencer

involves two expansion chambers connected by a double-tube arrangement.

Absorbent material is provided to attenuate the noise in the higher

frequency range.

Some automotive silencers use a two-pass internal tube arrangement,

in which the inlet and outlet tubes are extended into the expansion volume,

and several holes are placed in the inlet and outlet tubes, as shown in Fig.

Silencer Design 389

Copyright © 2003 Marcel Dekker, Inc.

390 Chapter 8

FIGURE 8-19 Industrial silencer. (By permission on MAXIM Silencer Engineering,

Beaird Industries, Shreveport, LA.)

Copyright © 2003 Marcel Dekker, Inc.

8-20. This design involves both the side-branch principle and the wavereflection

principle discussed in previous sections.

Some geometries for commercial panel-type silencers are shown in Fig.

8-21. These units are primarily dissipative-type silencers. Water-filled tubes

have been included within the open spaces of the silencer to provide ‘‘heat

recovery’’ capabilities for the silencer, as well as attenuation of the noise

from a gas turbine located upstream of the silencer.

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