English

Abstract

During the reciprocation motion of the piston in the cylinder, the piston exerts small amount of forces on the piston skirt due to the taper in the piston design. These forces tend to develop deflections on the cylinder liner. Because of these deflections there is every possibility of disturbance in the coolant around the cylinder liner. Because of this reason bubbles are formed and destroyed in the coolant. These bubbles are also formed due to excessive harmonic vibrations of the engine and also by loosely fitted liners. The continuous formation and destruction of bubbles in the cylinder liner coolant releases energy which will attack the cylinder liner and pitting action is caused. Because of this pitting action the life of the cylinder liner decreases. In this project study of these forces and vibrations are done using CAD/CAE softwares. The main objective of this project is to study the presence of cavitation and find the possible ways of increasing the life of the engine components. Modal analysis followed by harmonic analysis is carried out in the frequency range of 0100Hz.The thermal loads applied from the combustion chamber and fluid structure interaction is also considered for the analysis. The presence of cavitation is shown as negative pressure in the analysis. A model has been built out using Modeling software UNIGRAPHICS NX.Finite Element Analysis software Ansys is used to performharmonic analysis. The pressure distribution in the cylinder liner is plotted and discussed. FINITE ELEMENT ANALYSIS In this paper, A model to plot pressure distribution in the cylinder liner is carried out using CAD software, with the help of Finite Element Analysis,harmonic analysis and Fluid StructureInteraction Analysis is carried out. Some important results have been shown with the negative pressures which shows the presence of cavitation in the cylinder liner surface, stressing the importance of improving the piston and cylinder liner design. To show the presence of cavitation a coupled field analysis is done to transfer the temperature distribution on the liner structure. The analysis is then followed by harmonic analysis with fluid structure interaction (FSI) in the frequency range of 0100Hz. METHODOLOGY: