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A mathematical model has been used to study the vaporization process of fuel film spread out on the combustion chamber surfaces in diesel engines, which consists of a system of differential equations of heating and vaporizing of the fuel film. The fuel film vaporization process is characterized as the coupling heat and mass transfer process. A corresponding calculation code is programmed using FORTRAN language. As an application example, the vaporization process of the fuel film on the combustion chamber surface in a 6E150C diesel engine is investigated quantitatively, and the effects of different parameters on the fuel film vaporization process are discussed. The experimental data support the calculated results. A drawing software is completed using C language, which can be combined with the above calculation software and receive the data from the calculated results.

A solution for cylinder wall scuffing is researched. By means of the finite element method, a mathematical model to investigate the temperature field and thermal deformation of the piston is established, which can be used for predicting the cylinder wall scuffing in both the design process of a new diesel engine and the improvement process of the combustion system of an operating diesel engine. The experimental data support the calculated results obtained by using the model. As an application example, the temperature fields and thermal deformations of the piston in the 6E150C diesel engine, which suffers from the cylinder wall scuffing during the period of operation, are analyzed quantitatively by using the mathematical model. After an improved piston with new structure and good cooling system is used in the 6E150C diesel engine, the cylinder wall scuffing no longer occurs.