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Computational investigation of a large containership propulsion engine operation at slow steaming conditions

机译：在慢速汽蒸条件下大型集装箱船推进发动机运行的计算研究

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In this article, the operation of a large containership main engine was investigated with emphasis at slow steaming conditions. A cycle mean value approach implemented in the MATLAB/Simulink environment was adopted to simulate the two-stroke marine diesel engine due to the fact that it combines simplicity with adequate prediction accuracy. For accurately representing the compressor performance when the engine operates at low loads, the extension of the compressor map at the low rotational speed region was carried out based on a non-dimensional parameters method incorporating a novel way of calculating the compressor isentropic efficiency. The compressor map extension method results were validated using a corrected similarity laws approach. The engine steady state operation for various loads was simulated and the predicted engine performance parameters were validated using shop trial measurements. Furthermore, the engine transient operation in the load region below 50% was studied and the simulation results including the compressor operating points trajectory are presented and discussed. Based on the obtained results, the influence of the activation/deactivation of the installed electric driven blowers and the turbocharger cut-out on the engine operation was analysed.
机译：在本文中，研究了大型集装箱船主机的运行，重点是在缓慢的蒸汽条件下。由于其结合了简单性和足够的预测精度，因此采用了在MATLAB / Simulink环境中实现的循环均值方法来模拟二冲程船用柴油机。为了准确地表示发动机在低负载下运行时的压缩机性能，基于无量纲参数方法结合了一种新的计算压缩机等熵效率的方法，在低转速区域扩展了压缩机特性图。压缩机图扩展方法的结果使用校正的相似性法验证。模拟了各种负载的发动机稳态运行，并使用车间试验测量结果验证了预测的发动机性能参数。此外，研究了低于50％负载区域的发动机瞬态运行，并给出了包括压缩机运行点轨迹在内的仿真结果。基于所获得的结果，分析了已安装的电动鼓风机的启用/停用和涡轮增压器的切断对发动机运行的影响。

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