Performance failure simulation and characteristic analysis of marine diesel engine turbocharging and gas-exchange system under different running conditions
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초록
Taking a two-stroke marine diesel engine as an example, this study first builds up a thermodynamic simulation model of a turbocharging and gas-exchange system in MATLAB/Simulink, which is verified by the experimental results of a diesel engine under normal conditions. The boundary condition and corresponding model parameters are changed to simulate typical performance failures, including extremely high engine room temperature, intake filter blockage, intercooler fouling at the water side, overly high intercooler cooling water temperature, scavenging port fouling, clogged turbine nozzle, worn turbocharger bearing, and turbine exhaust passage fouling. The thermodynamic parameters of a diesel engine under different running conditions and performance failures are analyzed in terms of relative deviation, which demonstrates the relationship between the performance failures and thermodynamic parameters. This relationship could be mostly free of the engine running conditions. Finally, a normalization method is proposed to eliminate the influences of the engine room temperature and intercooler cooling water temperature. Thus, the performance failures could be detected according to the relative deviation of the proposed thermodynamic parameters under different running conditions throughout the entire engine working range. This method may provide a more practical foundation and possible breakthrough in the condition monitoring and failure diagnosis of marine diesel engines onboard ships.
Abstract
Taking a two-stroke marine diesel engine as an example, this study first builds up a thermodynamic simulation model of a turbocharging and gas-exchange system in MATLAB/Simulink, which is verified by the experimental results of a diesel engine under normal conditions. The boundary condition and corresponding model parameters are changed to simulate typical performance failures, including extremely high engine room temperature, intake filter blockage, intercooler fouling at the water side, overly high intercooler cooling water temperature, scavenging port fouling, clogged turbine nozzle, worn turbocharger bearing, and turbine exhaust passage fouling. The thermodynamic parameters of a diesel engine under different running conditions and performance failures are analyzed in terms of relative deviation, which demonstrates the relationship between the performance failures and thermodynamic parameters. This relationship could be mostly free of the engine running conditions. Finally, a normalization method is proposed to eliminate the influences of the engine room temperature and intercooler cooling water temperature. Thus, the performance failures could be detected according to the relative deviation of the proposed thermodynamic parameters under different running conditions throughout the entire engine working range. This method may provide a more practical foundation and possible breakthrough in the condition monitoring and failure diagnosis of marine diesel engines onboard ships.
참고문헌 (14)
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