Pre-chamber combustion system for heavy-duty engines for operating dual fuel and diesel modes

Shin, Jisoo; Choi, Jonghui; Seo, Jeong Woo; Park, Sungwook

doi:10.1016/j.enconman.2022.115365

Cited by 23 publications

(4 citation statements)

References 19 publications

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“…Under hightemperature and high-pressure conditions inside the cylinder, the nitrogen contained in the air is oxidized, and thermal NOx is generated. 29,30 As shown in Figure 5, the amount of oxides (O 2 ) emitted by the LPDI is greater than or equal to that emitted by the GDI. This phenomenon indicates that unburned O 2 was emitted because sufficient fuel was not supplied to the engine owing to the fuel conversion.…”

Section: Performance Verification Of Lpg Conversion Enginementioning

confidence: 93%

Feasibility evaluation and optimization of liquefied petroleum direct injection (LPDI) conversion engine for low pollutant emission vehicles

Woo

Kwon

et al. 2023

International Journal of Engine Research

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Owing to environmental regulations and energy issues, the development of low-emission and high-efficiency vehicles is required. Liquefied petroleum gas (LPG) is a representative low-pollutant fuel and the third most commonly used fuel for internal combustion engines worldwide. In this study, we propose to convert the existing gasoline direct injection (GDI) to liquefied petroleum direct injection (LPDI) as the simplest way to reduce pollutant emissions from the exhaust gases of internal combustion engine vehicle (ICEV). The conventional GDI engine fuel system was converted to an LPG system, and the pollutant emissions and three-way catalyst conversion efficiency were analyzed. As a result of fuel conversion, a phenomenon occurred in which the three-way catalyst did not operate normally under some operating conditions. By calibrating the fuel pressure signal by signal converter to increase the pressure in the high pressure fuel rail, the three-way catalyst was normalized. Finally, by adjusting the fuel rail pressure of the LPDI conversion engine, the optimization was performed, and the engine performance was evaluated.

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Section: Performance Verification Of Lpg Conversion Enginementioning

confidence: 93%

Feasibility evaluation and optimization of liquefied petroleum direct injection (LPDI) conversion engine for low pollutant emission vehicles

Woo

Kwon

et al. 2023

International Journal of Engine Research

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“…Therefore, to obtain the influence law of diesel combustion on the flame propagation and development in a cylinder, researchers conducted relevant experimental and simulation studies on the effects of pilot fuels on ignition and combustion [11][12][13]. Simpson [14] and Shin [15] investigated the influence of pre-combustion chamber structural parameters and nozzle design on the development of flame. They found that the nozzle parameters have a direct impact on the combustion stability and NOx emissions.…”

Section: Introductionmentioning

confidence: 99%

Research on the Ignition Strategy of Diesel Direct Injection Combined with Jet Flame on the Combustion Character of Natural Gas in a Dual-Fuel Marine Engine

Liu,

Liu

2024

JMSE

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In large-bore two-stroke diesel/nature gas dual-fuel marine engines, a certain quantity of diesel is injected into the cylinder to satisfy the full-power output engine rated power of the gas mixture. However, the ignition and flame propagation process based on the injection strategy of diesel direct injection combined with diesel jet flame on the ignition and combustion of natural gas is unclear, which directly affects the power and the thermal efficiency of engine and emissions. Therefore, this work numerically investigates the flame propagation characteristic under the strategy of the main and pilot diesel modes. The influence of the injection timing and proportion of diesel on combustion and emission performance are further analyzed. The results show that the influence of the injection timing of main diesel (MDIT) on the combustion process and emission performance is more obvious than that of the injection timing of pilot diesel (PDIT). The results indicate that the MDIT increased from −2°CA to −8°CA, the power increased by 316 kW, and the thermal efficiency improved by 1.5%. However, the CO2 emissions increased by 10.5 g/kWh, and the NOx emissions increased by 0.7 g/kWh. Additionally, an early PDIT is not conducive to the rapid organization of combustion, resulting in decreased engine power and thermal efficiency. Furthermore, it was found that the power improved by 50 kW and the thermal efficiency improved by 0.6%, with a decrease in the main diesel ratio (MDR) from 100% to 90%. Meanwhile, the CO2 emissions decreased by 4 g/kWh, although there was no obvious change in NOx emissions with the advance of MDR.

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“…The orifice geometric parameters have two main effects, one is that the orifice is an induction device for the inflow of gas and affects the flow field inside the pre-chamber, and another is that the orifice could determine the turbulent jet velocity, compositions, distribution, and so on. 19,20 Shin et al 21 investigated the effects of pre-chamber design parameters on engine efficiency and emissions in both dual-fuel and diesel-only modes. In dual fuel mode, the gross indicated mean effective pressure (IMEP) increased up to 1.1% when the orifice diameter was increased from 1.6 to 2.4 cm, this was because the combustion duration after TDC is lengthened.…”

Section: Introductionmentioning

confidence: 99%

Effect of spark timing on the pre-chamber jet ignition in a lean-burn natural gas engine

Xue

Wang

Zhao

et al. 2023

International Journal of Engine Research

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An enhanced combustion concept, pre-chamber jet ignition can provide high ignition energy and a wide dispersion of ignition sources, thus improving combustion performance and realizing stable lean combustion. However, the ignition performance of the pre-chamber jets depends strongly on the pre-chamber combustion process and is sensitive to many factors. Therefore, this paper will explore the impact of spark timing on the pre-chamber combustion, turbulent jet characteristics, and main chamber combustion performance by CFD simulation based on an active pre-chamber natural gas engine. The in-cylinder flow and combustion processes of the engine are calculated with the fuel-air equivalence ratio of the main chamber maintained at 0.5, and the spark timing varied from 684°CA to 708°CA with a step of 3°CA (compression top dead center is 720°CA). The results show that, in the present engine operating point, the pre-chamber combustion heat release rate is improved when the spark timing is retarded from 696°CA to 705°CA, and the injection velocity of the pre-chamber jet accordingly increases. As the spark timing continues to be delayed until 708°CA, the pre-chamber combustion deteriorates, and the injection velocity of the pre-chamber jet decreases. Under the combustion phase CA50 no more than 725°CA and the combustion duration CA5-90 fixed around 30°CA, the IMEP will maintain a relatively stable value when the spark timing is delayed from 693°CA to 705°CA, in the meantime, the NOx emission decreases with the delay of spark timing. Therefore, on the premise of ensuring engine power performance, it is a feasible scheme to delay spark timing to reduce NOx emission for the natural gas engine with an active pre-chamber.

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Pre-chamber combustion system for heavy-duty engines for operating dual fuel and diesel modes

Cited by 23 publications

References 19 publications

Feasibility evaluation and optimization of liquefied petroleum direct injection (LPDI) conversion engine for low pollutant emission vehicles

Feasibility evaluation and optimization of liquefied petroleum direct injection (LPDI) conversion engine for low pollutant emission vehicles

Research on the Ignition Strategy of Diesel Direct Injection Combined with Jet Flame on the Combustion Character of Natural Gas in a Dual-Fuel Marine Engine

Effect of spark timing on the pre-chamber jet ignition in a lean-burn natural gas engine

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