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The article considers possible methods for solving the problems arising during long-term operation of main ships engines in slow steaming modes, which necessity caused by the requirements of the new edition of Annex VI to the MARPOL 73/78 international convention for improving the vessel’s energy efficiency and reducing carbon dioxide emissions. With a decrease the speed of the vessel to 0.7 of full, the power of the main engine is reduced to 35% of the nominal. Long-term operation at this power leads to a decrease service life of mane engine. Studies show that an effective means of ensuring an optimal working process in a wide range of engine conditions is an adjustable turbocharging. It can be done either by installing a turbocharger with an adjustable cross-section of the turbine nozzle apparatus, or by using a register-type supercharging system. The efficiency of application of turbocharging with adjustable nozzle device, which allows to provide the optimum excess air ratio in a wide range of operating modes of the engine, is analyzed in the article. As a result, in the power range of 25 – 75 %, a reduced specific effective fuel consumption is provided, carbon dioxide and hydrocarbon compounds are reduced. The effectiveness of the application of the methods for optimizing the operation of engines considered in the article is analyzed. Analyzed of the data obtained from the results of numerical simulation using turbocharging with an adjustable cross-section of the turbine nozzle apparatus (Variable Turbine Area). Also, a comparative analysis of the parameters of bench tests and performance of the engine with the use of a turbocharger cut out system was performed. Conclusions are made about the efficiency of using, the considered methods of optimizing the main engine’s working processes during long-term operation at slow steaming modes.

vestnik gosudarstvennogo universiteta morskogo i rečnogo flota imeni admirala s. o. makarova/vestnik gosudarstvennogo universiteta morskogo i rečnogo flota imeni admirala s.o. makarova

APPLICATION OF ADJUSTABLE TURBOCHARGING FOR OPTIMIZATION OF WORKING PROCESSES OF MAIN SHIPS ENGINES DURING THE LONG-TERM OPERATION AT THE SMALL POWER MODES