This study aims at the parametric investigation of the gas injection system settings of a large marine two-stroke dual fuel engine by using a developed and customized CFD method in the ANSYS Fluent software. The investigated engine injection system parameters include the gas injection timing, the gas injection duration, the gas injector lateral angle, and the gas injector holes number. Based on the comparison of the predicted performance parameters for the closed-cycle processes, the results indicate that the gas injector lateral angle is the most significant parameter that affects the engine power as well as the NO and CO2 emissions. For satisfying the contradictory objectives of retaining the engine power and reducing the NO and CO2 emissions, appropriate design settings for the gas injection are recommended for the investigated engine operation in the gas mode at 75% load.

中文翻译：

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基于计算流体动力学的大型二冲程船用高压直喷发动机参数研究

本研究旨在通过在 ANSYS Fluent 软件中使用开发和定制的 CFD 方法对大型船用二冲程双燃料发动机的气体喷射系统设置进行参数研究。研究的发动机喷射系统参数包括气体喷射时间、气体喷射持续时间、气体喷射器侧角和气体喷射器孔数。基于闭环过程的预测性能参数的比较，结果表明气体喷射器侧向角是影响发动机功率以及 NO 和 CO2 排放的最重要参数。为了满足保持发动机功率和减少 NO 和 CO2 排放的矛盾目标，