Design and Analysis of Exhaust System for Ultra-fuel Efficient Vehicles

Abstract

Exhaust systems for Internal Combustion (I.C) engines have been finding their significance in the performance of an engine from its inception. One of the detrimental factors for the performance of exhaust is the amount of backpressure building through the flow. This study focuses on reducing backpressure occurring in the exhaust and increasing the ease of manufacturability for a 50 cm3 single cylinder Spark Ignition (S.I.) engine used in an ultra-fuel efficient vehicle. The flow of the exhaust gases from the engine are analyzed with the help of ram induction theory. Computational Fluid Dynamics has been employed to facilitate the study of turbulent flow in the exhaust and obtain results close to a streamlined flow. Parameters such as dimensions, operating pressures and velocities are calculated to understand the flow characteristics. The results strengthen the bilateral scopes of study here being, smooth flow of exhaust gases and greater manufacturability. The bend and end cone angles are defined in such a way that the wastage of material is least and complexity of the geometry is moderate. The exhaust has been designed keeping the chassis and engine complacency constraints in concern. The results of this study can be useful in manufacturing and integration with light gasoline engines, but of the same orientation as the one discussed here, for prototyping purposes.