Design Development and Analysis of Reactive Type Resonator Chamber Muffler for IC Engines A Review

Reactive silencers, which are commonly used in automotive applications, reflect the sound waves back towards the source and prevent sound from being transmitted along the pipe. Reactive silencer design is based either on the principle of a Helmholtz resonator or an expansion chamber, and requires the use of acoustic transmission line theory. Structure of current silencers involves a drawback which is essentially focused on the fact that silencers are large if they are to be acoustically effective, which in turn means that they are heavy in relation to the power of engines. More specifically, this problem is because current silencers require a large volume of air to be able to dissipate the frequencies generated by the exhaust gases from the engine. Therefore, in order to obtain a certain acoustic performance a very large and therefore very heavy silencer is required. The dimensions required for silencers are also determined by the need to maintain certain counter pressure levels. The objective of the invention is to obtain a silencer with optimal acoustic performance in relation to its size or volume, as well as a reduction in the counter pressure to the flow of gases, i.e. while at the same time reducing the noise, it also minimizes the power it takes away from the engine of the vehicle. By Mathematical modeling we will calculate dimensions of the silencer; modeling will be done in CAD modeling package, stress analysis is to be done using Finite Element Analysis. Experimental analysis will be done on prototype by application of 35 cc engine to determine noise level (dB) and validate flow rate of exhaust gases, pressure drop across silencer, temperature gradient