The exhaust silencer plays a really vital part to muffle the noise coming from the blasts inside a combustion engine .It's also used to cleanse the exhaust gases together with the help of a catalytic converter. Get extra information about fan silencer
The exhaust design,as you may have noticed,has a bulge towards the end. The cause behind producing this bulge is usually to give a bigger cavity for the exhaust gases to flow,this mellows the sound coming straight from the engine and performs around the principle of a Helmholtz resonator.
One other design kind, that my physics teacher taught me about ,consists of splitting the exhaust stream into two with all the aid of a secondary channel emerging from the pipe after which reconnecting it back .the length of this secondary channel is such that when the two sound streams meet again ,they're 180 degrees out of phase with respect to each other,this causes destructive interference at this junction! Hence muffling the sound.
The catalytic converter catalyzes the redox reaction of ‘carbon monoxide-hydrocarbons’(ox) and ‘nitrogen oxides’(red) ,which basically helps in converting pollutants to significantly less harmful gases.
