Using the thermodynamic processes features to assess the diesel power plants technical condition

Abstract

The results of studying the thermodynamic processes features and analyzing the prospects for using their characteristics to assess the technical condition of diesel power plants are contained in the paper. A structural diagram of a ship power plant, which is proposed to be considered consisting of separate components of mechanical part, thermodynamic part, fuel supply system and automatic speed control system equal in degree of influence on efficiency is proposed. The theoretical analysis results of the joint operation of the mechanical and thermodynamic components of the diesel power function have shown that the temperature of the working surfaces is an important characteristic of the power plant technical state. The concept of the thermodynamic component in this case refers to a combination of fuel combustion processes and combustion product expansion. To improve the design and efficiency of power plants operation, it is necessary to further study the in-cylinder fuel combustion processes and develop operational methods for monitoring the thermal state of diesel internal combustion engines. Control of changes in functional dependencies of working medium temperature on operating conditions and technical condition can in practice contribute to increase the efficiency of ship power plants operation. The experimental studies of the thermal imaging methods prospects to assess the diesel engines technical condition are carried out. It is found that the control reliability increases with an increase in the size of the diesel engine frame due to a decrease in the intensity of the dynamics of temperature equalization of individual cylinders. At the same time, the most expedient and informative is the control of the temperature of the diesel engine exhaust manifold, carried out during the heating of the cold engine or immediately after its completion.