What is the use of an exhaust silencer?

The exhaust silencer plays an incredibly important part to muffle the noise coming in the blasts inside a combustion engine .It's also used to cleanse the exhaust gases using the help of a catalytic converter. Get a lot more information regarding vent silencers

The exhaust design,as you may have noticed,includes a bulge towards the end. The explanation behind building this bulge should be to present a bigger cavity for the exhaust gases to flow,this mellows the sound coming directly in the engine and operates around the principle of a Helmholtz resonator.

One other design form, that my physics teacher taught me about ,contains splitting the exhaust stream into two using the help of a secondary channel emerging in the pipe after which reconnecting it back .the length of this secondary channel is such that when the two sound streams meet again ,they may be 180 degrees out of phase with respect to each other,this causes destructive interference at this junction! Therefore muffling the sound.

The catalytic converter catalyzes the redox reaction of ‘carbon monoxide-hydrocarbons’(ox) and ‘nitrogen oxides’(red) ,which essentially helps in converting pollutants to much less harmful gases.

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