Thermal Mapping and Cooling optimization of three-cylinder SI Engine using Computer Aided Engineering

Abstract

As an appreciable amount of heat is transferred through the I. C. engine which effects the engine performance, it is therefore essential to look forward to analyze the modes of heat transfer and temperature variations in the engine components. About 35% of the total chemical energy that enters an engine is converted to crankshaft work, & about 30% of the fuel energy is carried array from the engine in the exhaust flow. This leaves about one third of the total energy that must be dissipated to the surrounding by some mode of heat transfer. Temperatures within the combustion of an engine reach values on the order 2700 K and above. Materials in the engine cannot tolerate this kind of temperature & would quickly fail if proper heat transfer did not occur. Removing heat is highly critical in keeping an engine & engine lubricant away from thermal failure. On the other hand it is desirable to operate an engine as hot as possible to maximize thermal efficiency. It must be remembered that the reliability of an engine depends not so much, it is true on the proportion of the total heat converted into useful work, but rather upon the proportion of the total heat which is not so converted & which is left over to make trouble. This means that the cooling of an IC Engine should be optimisedto avoid overheating and overcooling. Efforts are taken to analyse the potential of CAE to optimize the Cooling of multicylinder SI Engine and the results are discussed.