The effect of structural parameters of pre-chamber with turbulent jet ignition system on combustion characteristics of methanol-air pre-mixture

Wang, Bin; Xie, Fangxi; Wang, Hong; Du, Jiakun; Chen, Hong; Yan, Shuicheng

doi:10.1016/j.enconman.2022.116473

Cited by 48 publications

(4 citation statements)

References 44 publications

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“…For prechamber ignition engines, many factors have great influences on the jet ignition process and engine performance, including the physical and chemical properties of the mixture, prechamber geometry, ignition parameters, combustion chamber shape, engine operating parameters, and so on. − Antolini et al investigated the jet characteristics and combustion in the main chamber with different orifice diameters based on an optically accessible single-cylinder spark engine. In all test conditions, the prechamber with a 1.2 mm orifice diameter had the shortest flame development duration, while the prechamber with a 1.0 mm orifice diameter presented the shortest combustion duration of the main chamber.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Operating Characteristics of the Passive and Active Prechamber Jet Ignition in a Natural Gas Engine

Yang,

Li,

Wang

et al. 2024

ACS Omega

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Prechamber jet ignition is a promising technology that enables stable ignition and fast combustion by combining thermal effects, chemical kinetics, and turbulent disturbance. The development and application of the prechamber ignition require a comprehensive and in-depth understanding of the operating characteristics of the prechamber ignition in the real engine working cycle. Therefore, numerical simulations are conducted to explore the operating performance of the prechamber ignition applied to a large-bore natural gas engine in this study. The differences between the passive prechamber (PPRE) and active prechamber (APRE) near the lean burn limit are compared. The results show that the jet ignition performance of the PPRE is hampered by the high residual gas coefficient and lean mixture in the prechamber under lean burn conditions. The ignition mode of the PPRE is similar to torch ignition, and the combustion process in the main chamber is mainly turbulent flame propagation. The ignition mechanism of the APRE is flame jet ignition. The main chamber combustion process presents a two-stage heat release characteristic, which can be subdivided into three phases: the initial flame development phase, the rapid combustion phase, and the late combustion phase. The heat release rate during the initial flame development phase depends on the physical and chemical properties of the prechamber jet and the mixture conditions in the main chamber. During the rapid combustion phase, the flame propagation along the radial direction of the jet largely depends on the time scale of the chemical reaction. The heat release rate depends on the coverage area of the jet, the jet residual momentum, and the turbulent flame speed. During the late combustion phase, the flame propagation is mainly affected by the turbulent flame speed. These results provide theoretical guidance for the subsequent application of prechamber ignition systems in various powertrains.

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Section: Introductionmentioning

confidence: 99%

Numerical Investigation of the Operating Characteristics of the Passive and Active Prechamber Jet Ignition in a Natural Gas Engine

Yang,

Li,

Wang

et al. 2024

ACS Omega

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“…The lean burn technology is considered one of the most important means to improve the engine’s thermal efficiency in specific operating conditions. , On one hand, lean burn means more fresh air into the cylinder, increasing the frequency of fuel–air contact and making the fuel burn more completely. On the other hand, lean burn reduces the pumping loss and heat transfer loss of the engine, further improving thermal efficiency. , The leaner charge can achieve better fuel economy and emission performance, but it requires more ignition energy and a faster flame propagation speed to maintain stable combustion …”

Section: Introductionmentioning

confidence: 99%

“…6,7 The leaner charge can achieve better fuel economy and emission performance, but it requires more ignition energy and a faster flame propagation speed to maintain stable combustion. 8 Mixture stratification and high-energy ignition are two strategies for extending the lean limit of an engine. Gong et al have significantly increased the lean burn limit of methanol engines using the stratified lean burn technology, while simultaneously improving thermal efficiency and decreasing pollutant emissions.…”

Section: Introductionmentioning

confidence: 99%

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High Compression Ratio Active Pre-chamber Single-Cylinder Gasoline Engine with 50% Gross Indicated Thermal Efficiency

Zhan

Chen

et al. 2023

ACS Omega

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Active pre-chamber turbulent jet ignition with a high compression ratio has been demonstrated to be an effective method for significantly enhancing engine thermal efficiency. A dual modification of the combustion chamber and the pre-chamber was performed on an AVL 5400 single-cylinder Miller engine to achieve stable ultra-lean burn at a high compression ratio, and a breakthrough of 51.10% gross indicated thermal efficiency was achieved at the compression ratio of 16.4 and λ = 2.236. Spark ignition and pre-chamber turbulent jet ignition exhibit significant performance diversities under lean burn conditions. Pre-chamber turbulent jet ignition is able to significantly expand the lean burn limit of spark ignition to λ = 2.7 (CoV IMEP < 5%) at only the expense of an increased HC emission, while apparently reducing fuel consumption and nitrogen oxide emissions. With an increase in the compression ratio from 13.6 to16.4, spark ignition and pre-chamber turbulent jet ignition exhibit contradictory performance laws. The engine performance of a spark ignition engine decreases significantly as the compression ratio increases, whereas a pre-chamber jet ignition engine can still operate reliably at a high compression ratio with ultra-lean combustion. Within the scope of the test, the performance of the pre-chamber jet ignition engine is enhanced by a greater compression ratio. This improvement is primarily attributable to the reduction of heat transfer loss and exhaust energy loss under ultra-lean combustion, as determined by an analysis of the structure of power losses.

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Improving the partial-load performance and emission of GDI engine by combining injection strategy and exhaust variable valve timing technology

Wang,

Xie,

Duan

et al. 2023

J Braz. Soc. Mech. Sci. Eng.

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The effect of structural parameters of pre-chamber with turbulent jet ignition system on combustion characteristics of methanol-air pre-mixture

Cited by 48 publications

References 44 publications

Numerical Investigation of the Operating Characteristics of the Passive and Active Prechamber Jet Ignition in a Natural Gas Engine

Numerical Investigation of the Operating Characteristics of the Passive and Active Prechamber Jet Ignition in a Natural Gas Engine

High Compression Ratio Active Pre-chamber Single-Cylinder Gasoline Engine with 50% Gross Indicated Thermal Efficiency

Improving the partial-load performance and emission of GDI engine by combining injection strategy and exhaust variable valve timing technology

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