Effect of miller cycle and fuel injection strategy on performance of marine diesel engine

Sun, Xiuxiu and Liang, Xingyu and Zhou, Peilin and Qian, Yuehua and Liu, Teng and Liu, Bo (2017) Effect of miller cycle and fuel injection strategy on performance of marine diesel engine. In: 11th Asia-Pacific Conference on Combustion, ASPACC 2017, 2017-12-10 - 2017-12-14.

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    Abstract

    Computational fluid dynamics (CFD) is used to investigate the performance of a large two-stroke marine diesel engine. The simulated model is validated with experimental data. The in-cylinder pressure of the simulated model is in agreement with the experimental data. The errors of NOx and CO2 emissions are also within the accepted range. The effect of Miller cycle, injection sequence and pilot injection on combustion and emissions are investigated using this model. The results show that the in-cylinder pressure decreases with deeper Miller cycle level. However, NOx emissions are reduced only slightly to 8.95 g/kWh. This decrease in NOx emissions does not satisfy the requirements of Tier III. We also found that the injection interval angle between two injectors decreases the combustion pressure. However, the indicated specific fuel consumption is 7.3 g/kWh higher than the base value, when the injection interval angle is 8 °CA. Appropriate pilot injection strategy can decrease NOx emissions and indicated specific fuel consumption, such as P10I5. However, NOx emissions are not reduced sufficiently to meet the requirements of Tier III.