Evaluation of fuel combustion characteristics in the marine diesel engine cylinder
DOI:
https://doi.org/10.24866/2227-6858/2025-1/105-113Keywords:
marine diesel engine, thermodynamic process, heat transfer, fuel combustion, combustion chamberAbstract
The characteristics of fuel combustion processes have a significant impact on the external performance of marine diesel engines. The lack of widely applicable methods for analyzing thermodynamic processes occurring in the cylinders of thermal engines does not fully reveal the possibilities of modernization and organization of technical monitoring of internal combustion engines. The purpose of this work is to justify the theoretical prerequisites for the analysis of the dependence of the characteristics of heat generation during fuel combustion on the angular velocity of the crankshaft, based on the analysis of indicator charts. Equations forming the basis of fuel combustion processes modeling are presented, the practical application of which can be useful in designing and monitoring the technical condition of marine engines. In contrast to traditional approaches, the paper proposes the representation of the space between the piston bottom and the upper part of the combustion chamber in the form of a slot channel and modeling of thermodynamic processes in the form of heat transfer by heat conduction and convection through the wall of the combustion chamber. Formula allowing to calculate amount of heat transferred to walls of combustion chamber and walls of cylinder bushing at movement of piston and at corresponding angle of crankshaft turn is presented. Using mathematical methods of estimating the amount of heat transfer through the walls of the combustion chamber, it is possible to determine the values of a reasonable ratio between the calculated heat generated during combustion and the chemical energy of fuel entering the engine cylinder in each cycle, as well as to assess the technical condition of the ship's power plant.
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