Design and Development of an Exhaust Muffler with Improved Transmission Loss for a Naturally Aspirated Diesel Engine

In the last two decades, most of the advances in exhaust systems such as acoustic filters and mufflers had been developed to attenuate noise levels and emissions as per environment norms. The purpose of this research work is to design, analyze and test an exhaust muffler in order to determine the pressure drop and noise reduction in the exhaust system. Computational Fluid Dynamic simulations were performed using ANSYS Fluent 16.2. The muffler diameter and length were chosen where as perforations and baffles were also considered so as to have the maximum pressure drop and noise reduction. This study is aimed at investigating a reactive perforated muffler. Several designs were considered for maximum pressure drop and the best was finally selected for manufacturing. Experimental testing was carried out with the finalized muffler prototype. Further the validation was done on a muffler in which the inlet pressure was found lower than that of the simulated results but the experimental outlet pressure was found higher than the simulated results. The backpressure was found to be less due to excess of air passage inside the muffler.