Multi-field coupling modeling and analysis of cylinder liner deformation

To improve the analysis technology of the cylinder liner deformation, on the basis of one V type diesel engine, the finite element analysis model of cylinder liner deformation was built, in which nonlinear temperature effect of materials and nonlinear contact effect between the structures were taken into account. With fluid solid coupling method, the water jacket wall heat transfer boundary conditions were obtained. The temperature field of cylinder head and cylinder liner were coupled to the deformation calculation to get the deformation of cylinder liner section. Using the discrete Fourier transform analysis method, cylinder deformation was decomposed, the characteristic of cylinder liner deformation was defined, and the impact factors of the deformation were analyzed. The correlation between inlet temperature of the cooling water jacket and cylinder liner deformation was discussed, and impact rules of cylinder liner deformation were summarized. Results show that, the deformation of cylinder liner top section was affected by temperature and cylinder head bolt preload. Middle and lower part section of cylinder liner deformation was little affected by temperature. Deformation of cylinder liner could be effectively controlled by choosing proper inlet temperature of cooling water jacket. This analysis method provides a reference for the multi-field coupling analysis.