Optimisation of various thermodynamic parameters for minimum temperature gradient along cylinder liner

Abstract

In a piston cylinder assembly, high temperatures are found in cylinder combustion spaces and the cylinder temperature is maintained by the water flowing through the engine jacket. Heat transfer takes place from in-cylinder gases to liner, from the liner to the coolant in the jacket. Generally, the water is treated as the most effective coolant, but the boiling point is raised by the coolant which is glycol based. It also gives lubrication to the pump seal, reduces the liner deterioration/wear and inhibits/avoids freezing. In the current research, different coolant mixture fractions at different flow rates, at various crank angles, are investigated for the control of the cooling rate which subsequently reduces liner distortion. The three-dimensional computational fluid dynamic (CFD) simulation is done here. Here the conjugate heat transfer analysis is used to investigate the heat transfer rate during the cooling in jacket of the engine by means of CFD. The CFD simulation results were certified/confirmed by laboratory tests performed in similar conditions.