Research on effects of early intake valve closure (EIVC) miller cycle on combustion and emissions of marine diesel engines at medium and low loads

Wei, Shengli; Zhao, Xiqian; Liu, Xin; Qu, Xiaonan; He, Chunhui; Leng, Xianyin

doi:10.1016/j.energy.2019.01.110

Cited by 30 publications

(9 citation statements)

References 18 publications

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“…The research shows that due to the relatively low engine output nitric oxide (NO) emission, the introduction of EGR allows the engine to operate with higher corrected net indicated efficiency (NIE) or lower specific total fluid consumption than the benchmark without EGR. Wei et al [25] analyzed the influence of early inlet valve closing (EIVC) Miller cycle on low and medium load combustion and emission of marine diesel engines. The research showed that appropriate EIVC would reduce the pressure, temperature, and NO emission in the cylinder.…”

Section: Of 25mentioning

confidence: 99%

Study on Performance of Locomotive Diesel Engine Fueled with Biodiesel Using Two Miller Cycle Technologies

Jiang

Zhou

et al. 2022

Processes

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In this paper, the simulation model was established based on GT-Power software, and a scheme using the Miller cycle based on biodiesel was proposed. Taking diesel engine 16V265H as the research object, the accuracy of the simulation model was verified by experiments. Combined with the comparison of physical and chemical characteristics of biodiesel and the experimental analysis of biodiesel under three different combinations, it was concluded that low ratio biodiesel was the best choice to meet the power, economy, and emission performance of diesel. Through the simulation scheme of the two Miller cycles for pure diesel (B0) and biodiesel (B10) under different load conditions at 1000 rpm, the NOx emission performance of pure diesel in a Miller cycle was significantly improved. On this basis, the comprehensive performance of the two Miller cycles was compared with biodiesel. The results showed that both the Miller cycles could reduce NOx emission. Combined with other key performances of a diesel engine, the best scheme to improve the performance of the diesel engine was to burn B10 biodiesel and overlap angle the Miller cycle of the variable valve at 30 °CA. The scheme has guiding significance for the application of the 16V265H diesel engine.

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Section: Of 25mentioning

confidence: 99%

Study on Performance of Locomotive Diesel Engine Fueled with Biodiesel Using Two Miller Cycle Technologies

Jiang

Zhou

et al. 2022

Processes

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“…Miller cycle has been widely concerned and studied because of its ability to reduce thermal load and fuel consumption. [17][18][19][20][21][22][23][24][25][26][27][28] Miller cycle forms high expansion ratio and low compression ratio working cycle through early or late closing of intake valve, which has obvious effect on reducing combustion pressure and temperature in cylinder. Nevin et al 29 studied the effect of the closing phase of the intake valve on the performance of a four-valve direct injection single-cylinder diesel engine.…”

Section: Introductionmentioning

confidence: 99%

Influence of Miller cycle on thermal load of high-boosted diesel engine

Wen

et al. 2022

Advances in Mechanical Engineering

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With the increase of the engine intensified degree, mechanical load and thermal load become to the two main factors limiting the engine to intensify. Application of Miller cycle, which can be realized by late intake valve closing (LIVC) and deeper late intake valve closing (DLIVC), has the potential to reduce the effective CR, mechanical load, and thermal load. In this paper, the effects of LIVC and DLIVC on the mechanical load and thermal load of a boosted DI diesel are experimentally compared. Compared to the original base case, the average cylinder temperature of LIVC and DLIVC is reduced by 90 and 52 K. The exhaust temperature of LIVC and DLIVC decreased by 26 and 14 K, and the maximum combustion pressure of LIVC and DLIVC decreased by 1.6 and 9.7 bar. The pumping losses of LIVC and DLIVC are reduced by more than 25%, while the actual cycle power does not decrease due to the late closing of the inlet valve. The fuel consumption rate decreased from 250.1 g/kWh of base case to 240 g/kWh of LIVC, reduced by 4.0%. The indicated thermal efficiency increased from 41.9% of base case to 43.7% and 42.5% of LIVC and DLIVC. Miller loss is only 2.55% with Miller inlet phase.

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“…Matsuo et al 12 showed that the Atkinson cycle engine of fourth-generation Prius is the world’s first gasoline engine to achieve 40% thermal efficiency. Wei et al 13 investigated the combustion process of a Miller cycle engine at low and medium loads, and achieved high-efficiency combustion. Pertl et al 14 studied combustion and fuel consumption of the Atkinson cycle engine and claimed that the small-sized Atkinson cycle engine may be a substitute for the future application of internal combustion engines.…”

Section: Introductionmentioning

confidence: 99%

Effects of intake valve opening duration on performance optimization of an Atkinson cycle engine under part load

Niu

Sun

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part D:

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A comprehensive analysis of the intake valve opening duration (IVOD) effects on the performance of an Atkinson cycle engine is conducted in this work using numerical simulation and experimental validation. Through one-dimensional simulation, the relationship between the range of IVOD and the compression ratios is firstly investigated under the constraint of compression pressure. Two representative IVOD, 295 and 314°CA, are then respectively applied to the performance simulation and experiment of a practical Atkinson cycle engine. The simulation shows the combination of a late intake valve opening timing (IVO) angle and a late exhaust valve opening timing (EVO) angle is profitable for improving the fuel economy under part load operating conditions (i.e. 2000 rpm@2 bar and 3000 rpm@3 bar). The experimental results present the Atkinson cycle engine under both IVOD scenarios considerably improves the brake specific fuel consumption (BSFC) and reduces the pumping mean effective pressure (PMEP) compared to those of the original Otto cycle engine. Meanwhile, the comparison between two IVOD scenarios show that the shorter IVOD leads to an improvement of indicated thermal efficiency, especially at lower load. Considering fuel economy, a shorter IVOD is more favorable at part load for the Atkinson cycle engine. Two main contributions of this work are to numerically quantify the IVOD range for the Atkinson cycle engine under part load, and to experimentally validate the effectiveness of simulation. The findings of this work are expected to support the design of Atkinson cycle engines and provide a guideline of IVOD optimization under part load.

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Research on effects of early intake valve closure (EIVC) miller cycle on combustion and emissions of marine diesel engines at medium and low loads

Cited by 30 publications

References 18 publications

Study on Performance of Locomotive Diesel Engine Fueled with Biodiesel Using Two Miller Cycle Technologies

Study on Performance of Locomotive Diesel Engine Fueled with Biodiesel Using Two Miller Cycle Technologies

Influence of Miller cycle on thermal load of high-boosted diesel engine

Effects of intake valve opening duration on performance optimization of an Atkinson cycle engine under part load

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