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Muffler with Perforates

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Muffler with Perforates

Reflective mufflers are best suited for the low frequency range where only plane waves can propagate in the system, while dissipative mufflers with fibers are efficient in the mid-to-high frequency range. Dissipative mufflers based on flow losses, on the other hand, work also at low frequencies.

A typical automotive exhaust system is a hybrid construction consisting of a combination of reflective and dissipative muffler elements. The reflective parts are normally tuned to remove dominating low-frequency engine harmonics while the dissipative parts are designed to take care of higher-frequency noise.

The muffler analyzed in this model, is an example of a complex hybrid muffler in which the dissipative element is created completely by flow through perforated pipes and plates.

Streamline plot showing the intensity and pressure, and slice plot showing the acoustic pressure level.

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