The effect of diesel pilot injection strategy on combustion and emission characteristic of diesel/methanol dual fuel engine

Tao, Wenhui; Sun, Tao; Guo, Wenjun; Lu, Kangbo; Shi, Lei; Lin, He

doi:10.1016/j.fuel.2022.124653

Cited by 16 publications

(3 citation statements)

References 31 publications

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“…25 Tao et al found that the NOx and smoke emissions can be reduced by 88% and 61% respectively by advancing the PIT. 26 Li et al improved the BTE to 46.58% by delaying the PIT and optimizing the PIR, while the emissions were maintained at a low level. 27 The pre-injection strategy with more flexible injection control parameters can reduce the rise rate of the maximum pressure in the cylinder and improve the combustion noise level.…”

Section: Introductionmentioning

confidence: 99%

The effect of a pine oil/diesel blend on the particulate emission characteristics of a diesel engine under a pre-injection strategy with EGR

Chen

Guo

Huang

et al. 2023

Sustainable Energy Fuels

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Section: Introductionmentioning

confidence: 99%

The effect of a pine oil/diesel blend on the particulate emission characteristics of a diesel engine under a pre-injection strategy with EGR

Chen

Guo

Huang

et al. 2023

Sustainable Energy Fuels

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“…Tao [29] experimentally investigated the effects of diesel pre-injection timing on combustion. The results indicate that the ignition is delayed and that the thermal efficiency decreases as the pre-injection time advances.…”

Section: Introductionmentioning

confidence: 99%

Effects of Methanol Addition on the Combustion Process of the Methanol/Diesel Dual-Fuel Based on an Optical Engine

Liu,

Guo,

Wei

2023

Energies

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The combustion process of traditional diesel engines is mainly determined by the injection timing of diesel. There is a trade-off relationship between the soot and NOx (nitrogen oxides) during this combustion process, making it difficult to reduce these two emissions simultaneously. The use of methanol can not only solve the above problem, but also replace some fossil fuels. However, the effects of methanol injection into the intake duct on the flame propagation in diesel/methanol dual-fuel engines is not yet clear, and there is relatively little research on it. The effects of methanol addition on the combustion process of diesel/methanol dual fuel (DMDF) were achieved based on a modified optical engine in this paper. One injector is installed on the intake inlet to inject methanol, and the other injector is installed in the cylinder to inject diesel in two stages before the top dead center of compression. There are three tests conducted separately in this paper. Firstly, the effects of the methanol ratio (40%, 50%, 60%, and 70%) on the combustion process are investigated, with the total heat remaining unchanged. Secondly, the effects of the pre-injection mass of diesel (20%, 30%, 40%, and 50%) on the combustion process are investigated, which keeps the total diesel mass unchanged. Finally, the effects of the total mass of diesel on the combustion process are investigated while maintaining the mass of methanol unchanged. The dual-fuel combustion process is recorded by a high-speed camera. A combustion analyzer and other equipment were used to analyze the combustion. The results showed that CA10 is delayed, the pressure and the heat release rate (HRR) are reduced, and the number of pixels of the KL factor (KL) decreases significantly with the increasing methanol ratio. CA10 and CA50 are advanced, the pressure and HRR decrease, and the KL increases when the mass of pre-injected diesel increases. CA10 and CA50 are advanced, respectively, and CA90 is postponed due to the increase in diesel mass. The pressure and HRR increase, and the KL increases when the total mass of diesel increases.

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“…Direct blending means methanol is emulsified and mixed with diesel to form a diesel-methanol mixture as an engine fuel [6][7][8]. Port injection methanol-diesel engine is to inject methanol into the intake port, where it is mixed with air before entering the cylinder during the intake process, while the diesel fuel is injected directly into the cylinder before the top dead center (TDC) for igniting the methanol [9][10][11][12]. Direct injection methanol-diesel engine is to inject both methanol and diesel directly into a cylinder.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Performance of Marine Diesel Engines Running on Diesel/Methanol and Diesel/Natural Gas Mode

Yao,

Ding,

Ben

et al. 2023

Moses

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With the increasingly stringent requirements of international decarbonization regulations, the shipping industry has accelerated the pace of exploiting low-carbon fuels. Methanol is one of the most prospective substitute fuels featured with low-carbon content, clean combustion and easy storage. For marine diesel/methanol dual-fuel engine applications, a certain quantity of diesel is typically used to ensure a stable ignition and combustion. However, the combustion and emission characteristics as well as the stable operation window of marine diesel/methanol dual-fuel engines under different operating loads have not yet been well investigated. In this study, a marine diesel/natural gas dual-fuel engine was used as a prototype to develop a 3D simulation model using CONVERGE, which was then validated using experimental data under different operating loads. The validated model was then employed to investigate the effects of methanol substitution rate (MSR) on the combustion and emission characteristics under the diesel/methanol operation mode. By monitoring the abnormal combustion phenomena such as misfire and knocking, the maximum MSR under different operating conditions was identified. Finally, the engine performances of diesel/natural gas and diesel/methanol modes were compared in terms of combustion and emission characteristics. The results show that the maximum MSR tends to increase first (from 5% to 43% under operation load from 25% to 75%) and then decrease (from 43% to 20% under operation load from 75% to 100%) with increasing operating load owing to the misfire limitation at low load and knocking limitation at high load, respectively. Comparing to the prototype diesel/natural gas mode, the diesel/methanol mode exhibited a shorter combustion duration with increased NOx emissions. The results obtained from this study are expected to guide the operation management of marine diesel/methanol dual fuel engines, and thus help reduce ships’ CO2 emissions.

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The effect of diesel pilot injection strategy on combustion and emission characteristic of diesel/methanol dual fuel engine

Cited by 16 publications

References 31 publications

The effect of a pine oil/diesel blend on the particulate emission characteristics of a diesel engine under a pre-injection strategy with EGR

The effect of a pine oil/diesel blend on the particulate emission characteristics of a diesel engine under a pre-injection strategy with EGR

Effects of Methanol Addition on the Combustion Process of the Methanol/Diesel Dual-Fuel Based on an Optical Engine

Comparative Study on the Performance of Marine Diesel Engines Running on Diesel/Methanol and Diesel/Natural Gas Mode

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