Abstract
In this present work the shape of piston crown is varied to obtain different types of combustion chamber shapes in direct injection engines . Combustion in I.C engine is generally considered the space between the crown of the piston and cylinder head. Pistons fail mainly due to mechanical stresses and thermal stresses. An experimental setup consisting of a computerized variable compression ratio diesel engine test rig with necessary instrumentation was established. A comprehensive load history in terms of pressure vs. crank angle(p-θ) diagram and (pressure vs. gas volume), speed, fuel and air consumption rates, turning moment etc., were obtained at compression ratio of 16.5 from the experimentation. Two pistons with different crown shapes, flat and hemispherical are designed by using Solid Works . Finite element analysis is performed in ANSYS , thermal-structural analysis carried out for two pistons by applying three different materials, From this analysis we observed that Thermal Conductivity and Factor of Safety plays a vital role in selecting the material for Piston. Hemispherical piston with Al 6061 alloy material having high factor of safety for a given loading condition.
Published Version
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