Predictive Simulation Of Analysing Orifice Noise In Exhaust System Of A Passenger Car

An IC Engine is major source of noise pollution, whereas exhaust noise play major contribution. Noise generated in engine is due to combustion of fuel & also Flow noise which is caused by turbulent gas which is one of the dominating noise sources on high performance turbo charged and naturally aspirated engines. Main function of Exhaust system is to expel the hot exhaust gases to the rear of vehicle (away from passenger compartment) & also to muffle the engine noise. Muffling of noise is majorly done by muffler/ Silencer, but other components of exhaust system also contribute in reducing the noise. This paper investigates the effect of Tail pipe on exhaust noise. The mechanisms of engine combustion noise via the exhaust system and flow excited noise are analysed. Several Geometric parameters such as pipe length, diameter, twin tail pipe and Y tail pipe have been changed simulation has been done to predict the effect on orifice noise. The length of tail pipe influences sound order distribution that influences customer responsiveness of sound.