Control of noise and temperature using radial air injection inside engine silencer

Abstract

Silencer is a device mainly used for attenuation of the engine exhaust noise. Several modifications were attempted to improve the performance of a silencer. In this paper experimental and simulation study was carried out to determine the effect of radial air injection on the temperature and sound pressure level. The radial air injection is introduced in the form of jets inside the silencer. The design of available silencer was studied, and the 3D model was prepared using CATIA software. Simulation study was carried out using ANSYS Fluent, to determine the temperature distribution inside the silencer with and without modification. The radial jets at different pressure were introduced inside the silencer at three different locations. To acquire sound pressure level and temperatures at different locations, Lab View software and FFT analyser were used. The performance of silencer is analysed by comparing temperature of exhaust gases and sound pressure level at constant speed of 3000 rpm. With radial air jets of 2 bar reservoir pressure at three different location Overall Sound Pressure Level reduces by 6 dB and 42 K reduction in temperature of exhaust gases.

Numerical investigation of multi-designed mufflers in internal combustion engines for noise reduction

“…The governing equation for acoustic analysis is the Helmholtz equation, which is expressed as follows [15,23].…”

“…The results showed that the noise can be reduced by up to 25 dB by using 4 cm of the proposed metamaterial. DESHMUKH and WAGHMODE [23] conducted experimental and numerical work on noise reduction. They investigated how air injection might contribute to noise pollution.…”