IMPROVEMENT OF THE FUEL COMBUSTION MODEL IN A DIGITAL TWIN APPLICATION FOR DIESEL ENGINES
Abstract
Introduction. The application of digital twins represents a promising solution for enhancing the efficiency of marine power installations, particularly their vital components – marine internal combustion engines (ICE). A digital twin, implemented on a dedicated server or as part of an engine monitoring system, is employed for automated data processing from sensors installed on the engine. It accumulates statistics, determines the current technical condition of the engine, assesses its operational efficiency, identifies potential malfunctions, and produces decision-making regarding modifications to operational programs. The key element of the digital twin is the mathematical model of the operating cycle of a marine diesel engine. This work focuses on a specific aspect of the performance type digital twin application developed for monitoring the technical condition and diagnosing faults in marine ICMEs, specifically addressing the synthesis of heat release characteristics within the engine cylinder. Purpose. The purpose of this study is to increase capabilities of the fuel combustion model applied for synthesizing heat release characteristics by considering the variable mean droplet diameter of the fuel spray during the injection process. This is crucial as the spray atomization conditions deteriorate at the beginning and end of the injection process. Results. As a result of the research, the mechanism of how the mean droplet diameter influences the interrelated processes of fuel evaporation and combustion is revealed. It is demonstrated that accounting for the variable nature of spray atomization significantly affects both the heat release processes and the formation of harmful substances. Conclusions. As the conclusion, incorporating the variable mean droplet diameter throughout the injection process allows for a more accurate representation of real operating processes, enhancing the adjustability and adaptability of the digital twin. However, complete utilizing the additional capabilities of the model requires the evaluation or measurement of fuel injection characteristics during engine operation, marking a prospect for future research.
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