Design and CFD Analysis of Exhaust Manifold for the Four - Cylinder SI Engine using Alternate Fuels

Abstract

One of the most crucial components of the engine is the exhaust manifold which incorporates the exhaust gases from the various different cylinders and sends it to the final exhaust pipe. The exhaust manifold is an important component of the automotive engine and hence it directly impacts the engine performance. The way of functioning of exhaust manifold is very intricate and the working efficiency of the exhaust manifold is dependent on various parameters like exit velocity of the exhaust gases, back pressure etc. This project emphasizes on the study of the thermal and flow characteristics of the exhaust manifold as well as the study of the backpressure effect onto the exhaust manifold. The exhaust manifold is analyzed using the distinct fuels namely alcohol, gasoline as well as LPG. The exhaust manifold chosen for the study is generic manifold used in the four-stroke gasoline engine. The project encompasses the design modelling which is performed in the CATIA software along with the theoretical analysis of the exhaust manifold thereby using ANSYS software. After the execution of the simulations, the conclusions are drawn regarding the effect of the various parameters on the efficiency of the exhaust manifold. Along with that, the fuels are also compared to determine the most suitable fuel used for the higher efficiency of the exhaust manifold. 

Keywords: Exhaust manifold, back pressure, exhaust gas velocity, CFD analysis, AutoCAD, ANSYS, fuel, gasoline, LPG, Alcohol