Parametric investigation of a large marine two-stroke diesel engine equipped with exhaust gas recirculation and turbocharger cut out systems

Lu, Daoyi; Theotokatos, Gerasimos; Zhang, Jundong; Zeng, Hong; Cui, Keying

doi:10.1016/j.applthermaleng.2021.117654

Cited by 18 publications

(8 citation statements)

References 34 publications

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“…The GT-SUITE software [55], which offers the tools and functionalities to enable effective engine modelling, was employed in this study to develop models of the zero/one-dimensional type that sufficiently represent both of the investigated engine configurations. These models were based on an existing model for the engine cylinders assembly (previously developed by the authors and reported in [49]). This model was subsequently expanded to incorporate the sub-models for the turbocharging and EGR systems.…”

Section: Engine Modelling Descriptionmentioning

confidence: 99%

“…The optimisation function in the ADO was employed to carry out simulations in all considered operating points (25%, 50%, 75%, and 100% loads) at each iteration, the results of which were used to calculate the average RMSE. The modelling details of the air cooler, the auxiliary, the scavenging receiver, exhaust receiver, and the connecting piping were previously described [49,61].…”

Section: Engine Core Component Modellingmentioning

confidence: 99%

“…The detailed descriptions of these two configurations are provided in Lu et al [49], whereas their layouts are presented in Figure 1. The studies discussed in the preceding paragraphs [35][36][37][38]42,43,[45][46][47], as well as more recent studies [50][51][52], focused on the BL-EGR configuration for marine diesel engines equipped with one TC unit.…”

mentioning

confidence: 99%

“…Kaltoft et al [41] reported the shipboard testing and the corresponding results for a large marine two-stroke engine, whereas Kim and Kim [53] investigated the shafting system torsional vibrations and the carbon emissions. In a previous authors' study [49], the capacity ratio between the large turbocharger (TC-L) and the small turbocharger (TC-S) was parametrically investigated, quantifying the effects of the TC selection on the engine performance parameters. However, comprehensive assessments of the BL-EGR and AL-EGR engine configurations, as well as studies to optimise the systems settings, are not available in the literature.…”

mentioning

confidence: 99%

“…Hence, this study, although it employs similar modelling tools as the previous authors' study [49], investigates different scenarios and cases studies with different operating modes and parametric optimisation. This study's novelty is associated with the following activities: (a) the parametric study of a large marine two-stroke diesel engine equipped with two parallel TCs of the same size (BL-EGR engine configuration); (b) the optimisation of the EGR and cylinder bypass rates for the BL-EGR engine configuration; (c) the quantification of the impact of the AL-EGR configuration settings on the performance and NOx emissions; (d) the recommendation of the most fuel-efficient operating modes for the AL-EGR engine configuration; and (e) a comparative assessment of the BL-EGR and AL-EGR engine configurations.…”

mentioning

confidence: 99%

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Comparative Assessment and Parametric Optimisation of Large Marine Two-Stroke Engines with Exhaust Gas Recirculation and Alternative Turbocharging Systems

Theotokatos

Zhang

et al. 2022

JMSE

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Although the exhaust gas recirculation (EGR) technology has been proven effective to decrease the marine engine’s nitrogen oxides (NOx) emissions, it is associated with a considerable fuel consumption increase and challenges to the engine–turbocharger matching. This study aims to parametrically optimise the EGR and turbocharging system settings of a large marine two-stroke engine with the objective of obtaining the highest engine efficiency whilst ensuring compliance with the prevailing NOx emissions limits. Two typical configurations of the investigated engine (baseline and alternative) are modelled in the GT-SUITE software. Parametric simulations are performed with EGR rates up to 40% along with cylinder bypass rates up to 50%, and the simulation results are analysed to quantify the impact of the engine operation with EGR on the performance and NOx emissions parameters. For the baseline engine configuration, the EGR rate increase considerably deteriorates the brake specific fuel consumption (BSFC), which is attenuated by opening the cylinder bypass valve. The optimal combinations of the EGR and cylinder bypass rates for each operating point are identified for both configurations. Following the comparative assessment between the two engine configurations, recommendations for the engine operating modes are proposed, leading to BSFC improvement in the region of 0.7 to 2.9 g/kWh. This study provides insights for the operational settings optimisation of two-stroke engines equipped with EGR systems, contributing towards the reduction of the associated environmental carbon footprint.

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Section: Engine Modelling Descriptionmentioning

confidence: 99%

Section: Engine Core Component Modellingmentioning

confidence: 99%