Gas flow silencer

摘要

A large number of parallel, thin-walled passageways 22 are arranged in a silencer body so that noise in the gas flow is silenced by viscous energy dissipation in the boundary layers on the passageways. The metal or moulded plastics defining the passageways 22 in an i.c. engine exhaust or intake silencer may have a wall thickness of 0.04 to 0.2 mm, with a passage length from 100 to 600 mm and a passage cross-sectional area from 1 to 3 mm<2>.