Optical study on the effects of the hydrogen injection timing on lean combustion characteristics using a natural gas/hydrogen dual-fuel injected spark-ignition engine

Zhang, Ren; Chen, Lin; Wei, Haiqiao; Pan, Jiaying; Li, Jinguang; Yang, Penghui; Chen, Rui

doi:10.1016/j.ijhydene.2021.03.171

Cited by 41 publications

(5 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…More detailed parameters about the research engine can be found in Table 1, and more details of the optical engine can be found in Ref. [25].…”

Section: Optical Engine and Operating Conditionsmentioning

confidence: 99%

See 1 more Smart Citation

Understanding the difference in combustion and flame propagation characteristics between ammonia and methane using an optical SI engine

Zhang

Chen²,

Wei³

et al. 2022

Fuel

Self Cite

View full text Add to dashboard Cite

“…More detailed parameters about the research engine can be found in Table 1, and more details of the optical engine can be found in Ref. [25].…”

Section: Optical Engine and Operating Conditionsmentioning

confidence: 99%

“…2C) with the same area of the projected flame and 𝑡 is time. More details for the processing of visualization images can be found in our previous works [25,27].…”

Section: Data Acquisition and Analysismentioning

confidence: 99%

Understanding the difference in combustion and flame propagation characteristics between ammonia and methane using an optical SI engine

Zhang

Chen²,

Wei³

et al. 2022

Fuel

Self Cite

View full text Add to dashboard Cite

“…Internal combustion engines (ICEs) are widely used in modern transportation (land, maritime, aviation, and inland waterway vessels), construction machinery, agricultural equipment, and power generation. Research into key technologies to save energy and reduce emissions of ICEs is of great significance for future global energy security and environmental protection. − Prechamber ignition is an advanced ignition technology of ICEs, which is shown to increase combustion efficiency and reduce fuel consumption and emissions.…”

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

View full text Add to dashboard Cite

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.

show abstract

“…Compared to pure H 2 combustion, dual-fuel concepts, which involve premixing H 2 with some hydrocarbon fuels as a promotor to take advantage of both fuels, have attracted a lot of attention. This strategy has been successfully applied in both SI [15][16][17] and CI [18][19][20] engines. For H 2 -enriched diesel engines, H 2 -air mixtures are induced into the cylinder and then ignited by a small amount of diesel, which has been extensively investigated in the last decades.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen Enhancement on Natural Flame Luminosity of Tri-Fuel Combustion in an Optical Engine

et al. 2022

View full text Add to dashboard Cite

A novel combustion mode, namely tri-fuel (TF) combustion using a diesel pilot to ignite the premixed methane–hydrogen–air (CH4–H2–air) mixtures, was experimentally investigated under various H2 fractions (0%, 10%, 20%, 40%, 60%) and ultra-lean conditions (equivalence ratio of φ = 0.5). The overarching objective is to evaluate the effect of H2 fraction on flame characteristics and engine performance. To visualize the effect of H2 fraction on the combustion process and flame characteristics, a high-speed color camera (Photron SA-Z) was employed for natural flame luminosity (NFL) imaging to visualize the instantaneous TF combustion process. The engine performance, flame characteristics, and flame stability are characterized based on cylinder pressure and color natural flame images. Both pressure-based and optical imaging-based analyses indicate that adding H2 into the CH4–air mixture can dramatically improve engine performance, such as combustion efficiency, flame speed, and flame stability. The visualization results of NFL show that the addition of H2 promotes the high-temperature reaction, which exhibits a brighter bluish flame during the start of combustion and main combustion, however, a brighter orangish flame during the end of combustion. Since the combustion is ultra-lean, increasing the H2 concentration in the CH4–air mixture dramatically improves the flame propagation, which might reduce the CH4 slip. However, higher H2 concentration in the CH4–air mixture might lead to a high-temperature reaction that sequentially promotes soot emissions, which emit a bright yellowish flame.

show abstract

Optical study on the effects of the hydrogen injection timing on lean combustion characteristics using a natural gas/hydrogen dual-fuel injected spark-ignition engine

Cited by 41 publications

References 43 publications

Understanding the difference in combustion and flame propagation characteristics between ammonia and methane using an optical SI engine

Understanding the difference in combustion and flame propagation characteristics between ammonia and methane using an optical SI engine

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

Effect of Hydrogen Enhancement on Natural Flame Luminosity of Tri-Fuel Combustion in an Optical Engine

Contact Info

Product

Resources

About