This study deals with the prediction of the heat flow and temperature of an IC engine piston having different types of cooling methods. This decade has seen a very significant increase in the load rating of the internal combustion engines. There is a marked shift in the current engines from the conventional NA (Naturally Aspirated) engines. The presence of turbo chargers and super chargers has improved the power output by more than two times. The engines develop a pressure upto 180 bar and release very high heat energy. This has resulted in a piston crown temperature to the tune of 350 Deg. Centigrade. The increase in temperature will have a very serious effect on the lubricating oil, as at elevated temperature oil will have greatly reduced viscosity. Therefore, it is essential to bring the temperature down by having a proper cooling arrangement for the piston system. Two design options of cooling the piston are studied in this paper. In the first option piston is cooled by forcing a jet of oil towards the under-crown portion of the piston. The second option is having a cavity popularly known as cooling gallery, through which the jet of oil is allowed to circulate. The predictive study is carried out by using Finite Element Analysis Techniques. The numerical results obtained for the two options are compared with the base line configuration and the effects of the modifications are discussed in detail. In addition transient thermal analysis is done to predict the transient thermal hoop stress developed in the piston bowl. Since transient hoop stress is the main cause for fatigue failure of the piston bowl, a parametric study is carried out to study the effect of cooling methods on thermal hoop stress.

This content is only available via PDF.
You do not currently have access to this content.