Numerical research of the in-cylinder natural gas stratification in a natural gas-diesel dual-fuel marine engine

Lu, Zhen; Ma, Menghao; Wang, Tianyou; Lu, Tianlong; Wang, Huaiyin; Feng, Yizhuo; Shi, Lei

doi:10.1016/j.fuel.2022.126861

Cited by 18 publications

(3 citation statements)

References 52 publications

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“…Liu experimentally investigated the variation patterns of NG energy substitution rate and pilot diesel injection time under single injection strategy and split injection strategy 32 , 33 . The low-pressure post-injection (LPPI) strategy was proposed by Lu 34 . They compared the LPPI with the low-pressure injection (LPI) strategy.…”

Section: Introductionmentioning

confidence: 99%

The impact of scavenging air state on the combustion and emission performance of marine two-stroke dual-fuel engine

Yu,

Gao,

Zhang

et al. 2024

Sci Rep

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The scavenging process significantly affects the combustion and emission performance of marine low-speed two-stroke dual-fuel engines. Optimizing scavenging air pressure and temperature can enhance the engine's combustion efficiency and emission control performance, thereby achieving more environmentally friendly and efficient operation of dual-fuel engines. This study focuses on marine low-speed two-stroke dual-fuel engines, analyzing the effects of scavenging air pressure (3.0 bar, 3.25 bar, 3.5 bar, and 3.75 bar) and scavenging air temperature (293 K, 303 K, and 313 K) on engine performance and emission products. The results indicate that scavenging air pressure has a greater impact on engine performance than scavenging air temperature. An increase in scavenging air pressure leads to higher thermal efficiency and power. As the scavenging air pressure increases from 3 to 3.75 bar, the indicated thermal efficiency (ITE) increases from 44.02 to 53.26%, and indicated mean effective pressure (IMEP) increases by approximately 0.35 MPa. Increased scavenging air pressure improves nitrogen oxide (NOx) and hydrocarbons (HC) emissions. For every 0.25 bar increase in scavenging air pressure, NOx emissions decrease by 3.53%, HC emissions decrease by 33.35%, while carbon dioxide (CO2) emissions increase by 0.71%. An increase in scavenging air temperature leads to lower ITE and IMEP. As the air temperature changes from 293 to 313 K, the ITE decreases by approximately 1%, and IMEP decreases by about 0.04 MPa. Increased scavenging air temperature improves CO2 emissions. For every 10 K increase in the air temperature, the CO2 emissions decrease by 0.02%, while NOx emissions increase by 4.84%, HC emissions increase by 34.39%. Therefore, controlling scavenging air pressure is more important than scavenging air temperature in the operational management of marine two-stroke engines. Higher power and lower NOx and HC emissions can be achieved by increasing the scavenging air pressure.

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Section: Introductionmentioning

confidence: 99%

The impact of scavenging air state on the combustion and emission performance of marine two-stroke dual-fuel engine

Yu,

Gao,

Zhang

et al. 2024

Sci Rep

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“…The experimental results showed that the fuel is distributed more randomly under low swirl ow while it is mainly concentrated on the le side of the combustion chamber under high swirl conditions. Lu et al 35 used an articial neural network (ANN) combined with a genetic algorithm (GA) to explore the appropriate swirl ratio and the corresponding spray angle for a large-diameter marine diesel engine. The thermal efficiency and output power of the best case are improved by 4.86% and 5.2%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effects of piston shapes and swirl ratios on combustion and emissions of a micro diesel pilot-ignition natural gas engine

Zhou

et al. 2023

Sustainable Energy Fuels

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“…As a result, various types of alternative fuels have experienced rapid development and application, with natural gas demonstrating significant advantages in terms of its economic viability and social benefits [3,4]. As a fuel, natural gas (the main component is methane) possesses the following advantages: firstly, it is a low-carbon fuel that can reduce carbon dioxide (CO 2 ) emissions [5]; secondly, it enables clean combustion, effectively reducing pollutant emissions, especially particulate matter emissions [6]; thirdly, natural gas has a high octane rating, exhibiting excellent resistance to knock [7]; fourthly, it mixes well with air, further expanding the operating range; and finally, natural gas reserves have been proven to be relatively abundant [8]. Therefore, natural gas holds vast prospects for application, and the development of natural gas engines represents an effective approach to achieve energy conservation, emissions reduction, and a decrease in CO 2 emissions [9,10].…”

Section: Introductionmentioning

confidence: 99%

Optical Study on the Effects of Methane Equivalence Ratio and Diesel Injection Mass on Diesel-Ignited Methane Combustion Process

Tian,

Cui,

Xiao

et al. 2023

Processes

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Pilot diesel ignition is an effective approach for achieving efficient and clean combustion of natural gas. In this study, a rapid compression and expansion machine (RCEM) was constructed for examining diesel-ignited premixed methane combustion. The effects of the methane equivalence ratio and pilot diesel mass on the combustion process of diesel-ignited premixed methane gas were investigated. The results show that the combustion process can be divided into two stages: diesel dominance and premixed methane combustion. An increase in the methane equivalence ratio inhibits diesel combustion, leading to delayed CA10 and OH radical generation. However, it enhances premixed methane flame propagation and improves the heat release rate, resulting in a shorter combustion duration. An increase in the pilot diesel mass contributes to a larger flame area and higher OH generation intensity in the ignition region; however, too large a diesel mass inhibits methane flame propagation towards the diesel nozzle due to an extended injection duration. In conclusion, a larger pilot diesel mass can achieve better overall combustion performance, but excessive amounts may be counterproductive.

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Numerical research of the in-cylinder natural gas stratification in a natural gas-diesel dual-fuel marine engine

Cited by 18 publications

References 52 publications

The impact of scavenging air state on the combustion and emission performance of marine two-stroke dual-fuel engine

The impact of scavenging air state on the combustion and emission performance of marine two-stroke dual-fuel engine

Effects of piston shapes and swirl ratios on combustion and emissions of a micro diesel pilot-ignition natural gas engine

Optical Study on the Effects of Methane Equivalence Ratio and Diesel Injection Mass on Diesel-Ignited Methane Combustion Process

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