DESIGN AND ANALYSIS OF MUFFLER FOR TWO- WHEELER

Noise from automobiles is one of the components for noise pollution to environment. Exhaust noise is one of the main source of vehicle and exhaust systems are developed to attenuate noise meeting required levels and sound quality emissions based on environment norms. Muffler is important part of engine system and commonly used in exhaust system to minimize sound transmission caused by exhaust gases. So to deal with this problem, muffler should be modified. But again there is one problem that is selection of type of muffler either reactive or absorptive. Absorptive muffler has more weight than reactive type as it is consisted of wound material over perforated pipes. So in this study reactive type muffler is modified for 110 cm3 four stroke engine of two wheelers. But maximum noise reduction affect backpressure of engine. Also pressure drop is one of the parameter which influences backpressure of engine as minimum pressure drop indicates minimum backpressure. Depending on space availability for muffler on vehicle body, external dimensions of new muffler are kept same as that of existing one. In this paper, a muffler is analyzed for varying porosity of pipes and it's effect on pressure drop by simulation.