Numerical investigation of natural gas-diesel dual-fuel engine with different piston geometries and radial clearances

Shen, Zhaojie; Wang, Xinyan; Zhao, Hua; Lin, Bo; Shen, Yitao; Yang, Jianguo

doi:10.1016/j.energy.2020.119706

Cited by 19 publications

(2 citation statements)

References 42 publications

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“…-optimization of the injection strategy by setting the timing of the Start of Injection (SOI), 31 the value of the rail pressure, and by splitting the fuel into multiple injections 32 ; -utilization of EGR 33 -optimization of the piston geometry and of the radial clearance between piston and liner. 34 When these measures are not sufficient, another way to extend the NG-diesel DF combustion mode at low loads could be the addition of a small amount of hydrogen (H 2 ) to the air-NG mixture. In fact, the presence of H 2 extends the Lower Flammability Limit (LFL) 35 of the premixed mixture thanks to the increase of the Hydroxyl radical (OH) concentration during the combustion process, which, in turn, promotes CO and UHC oxidation.…”

Section: Introductionmentioning

confidence: 99%

Influence of H₂ enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

Mattarelli

Rinaldini

Caprioli

et al. 2021

International Journal of Engine Research

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Dual Fuel (DF) combustion can help to reduce the environmental impact of internal combustion engines, since it may provide excellent Brake Thermal Efficiency (BTE) combined with ultra-low emissions. This technique is particularly attractive when using biofuels, or fuels with a low Carbon content, such as Natural Gas (NG). Unfortunately, as engine load decreases and the homogeneous NG-air mixture tends to become very lean, the high chemical stability of NG can be a serious obstacle to the completion of combustion. As a result, BTE drops and UHC and CO emissions become very high. A possible way to address this problem could be the addition of hydrogen (H2) to the NG-air mixture. In this paper, a numerical study has been carried out on an automotive Diesel engine, modified by the authors in order to operate in both conventional Diesel combustion and DF NG-diesel mode. A previous experimental characterization of the engine is the basis for the CFD-3D modeling and calibration of the DF combustion process, using a commercial software. The effects on combustion stability and emissions of different NG-H2 mixtures (six blends with 5%, 10%, 15%, 20%, 25%, and 30% by volume of hydrogen) are numerically investigated at a low load (BMEP = 2 bar, engine speed 3000 rpm). The results of the CFD-3D simulations demonstrate that NG-H2 blends are able to decrease strongly CO, UHC, and CO2 emissions at low loads. Advantages are also found in terms of thermal efficiency and NOx emissions.

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Section: Introductionmentioning

confidence: 99%

Influence of H₂ enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

Mattarelli

Rinaldini

Caprioli

et al. 2021

International Journal of Engine Research

View full text Add to dashboard Cite

show abstract

“…Muhssen et al [28] used FLUENT software to analyze and optimize the mixer of CNG-diesel dualfuel engine, and the mixture fuel showed good uniformity. Shen et al [29] had carried out numerical researches on four different piston clearances and piston geometry, pointing out that the main source of carbon hydride emission of NG-diesel dual-fuel engine was similar to spark-ignition engine mainly caused by piston gap. Yang et al [30] studied the mass, quantity, and particle size distribution characteristics of diesel NG dual-fuel engines under different NG air mixing conditions.…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Injection Strategies on Combustion and Emission Characteristics of Diesel Engine Fueled with Dual Fuel

et al. 2021

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In this work, an effective numerical simulation method was developed and used to analyze the effects of natural gas mixing ratio and pilot-main injection, main-post injection, and pilot-main-post injection strategies on the combustion and emission characteristics of diesel engine fueled with dual fuel. Firstly, the one-dimensional calculation model and three-dimensional CFD model of the engine were established by AVL-BOOST and AVL-Fire, respectively. In addition, the simplified chemical kinetics mechanism was adopted, which could accurately calculate the combustion and emission characteristics of the engine. The results show that the cylinder pressure and heat release rate decrease with the increase of the natural gas mixing ratio and the NOx emission is reduced. When the NG mixing ratio is 50%, the NOx and CO emission are reduced by 47% and 45%, respectively. When the SODI3 is 24 °CA ATDC, the NOx emission is reduced by 29.6%. In addition, with suitable pilot-main injection and pilot-main-post injection strategies, the combustion in the cylinder can be improved and the trade-off relationship between NOx and soot can be relaxed. Thus, the proper main-post injection strategy can improve the combustion and emission characteristics, especially the reduction in the NOx and CO emissions.

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Numerical and optimization modeling of dual-fuel natural gas–diesel engine at the idle load

Rezapour,

Deymi-Dashtebayaz

2024

J Therm Anal Calorim

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Numerical investigation of natural gas-diesel dual-fuel engine with different piston geometries and radial clearances

Cited by 19 publications

References 42 publications

Influence of H₂ enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

Influence of H₂ enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

Effects of Different Injection Strategies on Combustion and Emission Characteristics of Diesel Engine Fueled with Dual Fuel

Numerical and optimization modeling of dual-fuel natural gas–diesel engine at the idle load

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Numerical investigation of natural gas-diesel dual-fuel engine with different piston geometries and radial clearances

Cited by 19 publications

References 42 publications

Influence of H2 enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

Influence of H2 enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

Effects of Different Injection Strategies on Combustion and Emission Characteristics of Diesel Engine Fueled with Dual Fuel

Numerical and optimization modeling of dual-fuel natural gas–diesel engine at the idle load

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Influence of H₂ enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine

Influence of H₂ enrichment for improving low load combustion stability of a Dual Fuel lightduty Diesel engine