Effect of Small Hydrogen Jet Flame on Augmentation of Lean Combustion

Wakai, Kazunori; Kito, Shunsuke; Sumida, Isao

doi:10.4271/931943

Cited by 14 publications

(2 citation statements)

References 3 publications

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“…In fact, the concept of pre-chamber was first used in the Ricardo Dolphin engine in the early 20th century. 16,17 Later, some variants of the pre-chamber combustion system were developed and studied 18–26 but did not cause enough concerns. Until a serial of studies on the application of PJI systems in gasoline engines were conducted by Attard et al 27–33 and proved a considerable improvement of power and economic performances in 2010–2012, this technology began to attract more and more attentions.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of pre-chamber jet ignition in a rapid compression machine and single-cylinder natural gas engine

Zhao

Wang

et al. 2019

International Journal of Engine Research

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Pre-chamber jet ignition is a promising combustion technology to achieve fast combustion in natural gas engines. First, the ignition and combustion characteristics of mixtures in a pre-chamber system with different diameter orifices were studied under engine-relevant pressures and temperatures in a rapid compression machine. The tested fuels, CH4/air stoichiometric mixtures, were diluted by different proportions of CO2/N2 to simulate the corresponding exhaust gas recirculation conditions in engines. High-speed photography was applied to visualize the jet ignition and combustion processes. The experimental results revealed that two ignition patterns existed in the pre-chambers depending on the diameter of orifices. Pre-chamber jet flame ignition pattern appeared when the orifice diameter of the pre-chamber exceeded a critical value, which produced jet flame and ignited the mixtures in the main chamber directly. Pre-chamber jet auto-ignition pattern produced jet which promoted the auto-ignition of mixture in the main chamber when the orifice diameter was smaller and presented much shorter combustion durations. Based on the experimental results in the rapid compression machine, a practical pre-chamber system was designed in a single-cylinder natural gas engine to investigate the combustion performance and emission characteristics. The experimental results indicated appropriate 0.8%–1.4% increases of indicated thermal efficiency were achieved by pre-chamber jet ignition due to the higher combustion efficiency and shorter combustion duration compared to conventional spark ignition. Lower total hydrocarbon and CO emissions but higher NO x emissions were produced by pre-chamber jet ignition due to the faster burning velocity and higher combustion temperature.

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Section: Introductionmentioning

confidence: 99%

Experimental study of pre-chamber jet ignition in a rapid compression machine and single-cylinder natural gas engine

Zhao

Wang

et al. 2019

International Journal of Engine Research

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“…Investigators of Gifu University and Toyota College of Technology in Japan studied an ignition concept similar to the HAJI system. Wakai et al [140][141][142] isolated the effect on extending the lean limit by the active radicals and the turbulence generated by the jets in order to determine which had more influence on extending the lean limit. They found that turbulence has a more significant role than that of the chemically active radicals since a strong radical effect would be able to modify the reaction process and extend the lean inflammation limit but with the operating turbulence level that possibility was very low [36].…”

Section: Pre-chamber Technology | 31mentioning

confidence: 99%

Implementation and Analysis of the Pre-Chamber Ignition Concept in a SI Engine for Passenger Car Applications

Martínez Hernándiz

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The global greenhouse gas emissions increase since the start of the Industrial Revolution has become a serious hazard to human life. In addition to power generation and industry, transportation, with the rise in the total vehicle number in the last decades, is one of the main contributors to this exponential increase of global warming-causing gases. In fact, cities such as Barcelona or Madrid, among many others, are imposing traffic restrictions to mitigate this situation. However, mankind is still on time to reverse this negative tendency and fix the environmental issue for the upcoming generations.The main goal of the present Thesis focuses on the study, implementation and analysis of the passive pre-chamber ignition concept in a near-future light-duty passenger car application. To be more specific, the investigation addresses the physical phenomena involving the combustion process when pre-chamber ignition system is used in a spark-ignition engine. Then, some strategies to improve thermal efficiency while employing this concept are applied. Finally, with all the knowledge gathered, basic guidelines for a pre-chamber pre-design are presented.The first approach to the concept consists of its direct implementation in the engine, obtaining experimental results in three different operating conditions in terms of engine load and speed. Furthermore, different prechamber geometries are also evaluated. Although its direct implementation is relatively straightforward by exchanging the spark plug, understanding some of the relevant phenomena related to the combustion process, such as gas exchange or jet-tip penetration, is extremely difficult without the support of computational tools. This is the main reason supporting the use of 1D numerical tools in the present Thesis, since with proper modeling based on experimental data, further knowledge can be obtained in those situations where experimental evaluations are not feasible. These 1D tools have the benefits of their low computational cost and their ability to provide reasonably good results in a short period of time. ix xv[8] F. D. Sabatino, P. J. Martinez-Hernandiz, R. N. Rosa, and I. Ekoto. "Investigation of the effects of passive pre-chamber nozzle pattern and ignition system on engine performance and emissions". International Journal of Engine Research 0 (0), 2022.

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Experimental study on the combustion and flame propagation characteristics of CH4/O2/N2 premixed turbulent jets

Li,

Zhen,

Wang

et al. 2024

Energy

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Effect of Small Hydrogen Jet Flame on Augmentation of Lean Combustion

Cited by 14 publications

References 3 publications

Experimental study of pre-chamber jet ignition in a rapid compression machine and single-cylinder natural gas engine

Experimental study of pre-chamber jet ignition in a rapid compression machine and single-cylinder natural gas engine

Implementation and Analysis of the Pre-Chamber Ignition Concept in a SI Engine for Passenger Car Applications

Experimental study on the combustion and flame propagation characteristics of CH4/O2/N2 premixed turbulent jets

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