Effect of position of radial air injection for reduction of temperature and emission levels in a conventional silencer

Abstract

The silencer has been a device mainly used for attenuating engine exhaust noise. Several modifications have been attempted to make silencers more efficient. The performance of a silencer has been measured by the amount of reduction in sound pressure level. The aim of this study has been to determine the effect of radial injection of air in the silencer on temperature, sound pressure level, and emission levels. To carry out this study, the design of the available silencer has been examined, and a 3D model has been prepared in ANSYS. A simulation study has been conducted to determine the temperature distribution inside the silencer, the effect of radial air injection along the length of the silencer, and the reduction of emission gases. The simulation study has also been carried out to evaluate the temperature distribution inside the silencer. The input parameters to the silencer have been determined through the simulation study of an I.C. engine. It has been observed from the simulation results that a temperature reduction of 312 K has been achieved with three radial air jets. Furthermore, a reduction in CO emissions has also been observed due to radial air injection.