FEM analysis and experiment research on the cylinder liners of new medium-speed diesel engines

To investigate the thermal load features of new type marine medium-speed diesel engines' cylinder liners,two new-type medium-speed diesel engines of MAN BW6L16/24 and 8L21/31 were taken as research objects.The FEM models of the liners were built,and then the temperature fields of the liners were analyzed by using FEM software while some reasonable boundary conditions were considered.At the same time,the calculated results were verified by experiments with the thermal couples and rigidity-plugs.Results show that the temperature field of liners of new-type medium-speed diesel engines is optimized by the reasonable water jacket design,which can effectively satisfy the demand of high load density of modern diesel engine.