Jet Plume Injection and Combustion

Hensinger, D.M.; Maxson, J.A.; Hom, Kenneth; Oppenheim, A. K.

doi:10.4271/920414

Cited by 37 publications

(5 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

View full text Add to dashboard Cite

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“…Later, Oppenheim et al [14][15][16] at the University of California, Berkeley developed a similar ignition concept termed Jet Plume Injection and Combustion (JPIC). The JPIC igniter is essentially a miniaturized version of the valve-operated LAG combustion system that can be installed into an engine similar to a direct injector [8,15].…”

Section: Introductionmentioning

confidence: 99%

A study of a turbulent jet ignition system fueled with iso-octane: Pressure trace analysis and combustion visualization

2017

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Turbulent Jet Ignition is an advanced pre-chamber ignition enhancement technique for spark ignition engines that uses a discharging jet of hot combusting gases to initiate main chamber combustion. The jet acts as a distributed ignition source, leading to fast burn rates and increased combustion stability. Experiments were performed in an optically accessible rapid compression machine using liquid iso-octane to study the effects of auxiliary fuel injection and ignition distribution due to nozzle geometry. A custom low-flow fuel injector was used to overcome previous limitations of using liquid fuel in the pre-chamber. Jet induced autoignition behavior was also studied in depth by considering high-speed images, pressure traces, and pressure derivative data.

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“…1,[4][5][6] The divided chamber-stratified charge ignition concept has been further developed over the years. [7][8][9][10][11][12] The jet plume injection and combustion (JPIC) igniter was later developed by Maxson and colleagues [10][11][12] at the University of California, Berkeley, and further investigated by Murase and colleagues. [13][14][15][16] In the 1990s, Watson and colleagues [17][18][19] introduced the prechamber (PC) ignition concept named hydrogenassisted jet ignition (HAJI).…”

Section: Introductionmentioning

confidence: 99%

“…The jet ignition concept was initially introduced in the late 1950s 4,5 under the name of LAG (Lavinaia Aktivatsia Gorenia) that was translated to “avalanche activated combustion.” 1,4–6 The divided chamber–stratified charge ignition concept has been further developed over the years. 7–12 The jet plume injection and combustion (JPIC) igniter was later developed by Maxson and colleagues 10–12 at the University of California, Berkeley, and further investigated by Murase and colleagues. 13–16…”

Section: Introductionmentioning

confidence: 99%

Large eddy simulation of a homogeneously charged turbulent jet ignition system

Gholamisheeri

Givler

Toulson

2017

International Journal of Engine Research

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Transient jet ignition of a homogeneous methane air mixture in a turbulent jet ignition system is studied computationally using a large eddy simulation turbulence model. The jet discharges from a prechamber into a main combustion chamber via one or more orifice(s) and provides a distributed ignition source in turbulent jet ignition. The effect of orifice size and stoichiometry is studied numerically using the Converge computational fluid dynamics code. A reduced kinetic mechanism is used for combustion along with a Smagorinsky sub-model for turbulence modeling. The computed pressure traces are compared with experimental measurements through rapid compression machine tests. Computational fluid dynamics results are in acceptable agreement with the experimental data during compression and the early stage of combustion; however, an over-prediction of peak pressure was reported. Peak pressure error is in the range of 0.1%-4% for Reynolds-averaged Navier-Stokes simulation estimation compared to the experimental measurements. This error is a function of mixture stoichiometry and unburned gas temperature. The error calculation showed that with the large eddy simulation model, 1% and 12% improvements in peak pressure and burn rate estimations, respectively, were achieved compared to Reynolds-averaged Navier-Stokes results. The reduced large eddy simulation error relative to the Reynolds-averaged Navier-Stokes simulations were considered to be in the acceptable range; however, further improvements could be achieved through validation and testing of additional turbulence models. In addition, computational fluid dynamics temperature contours for various nozzle orifices and air-fuel ratios are compared to achieve deeper insight into the turbulent jet ignition combustion process in the rapid compression machine combustion cylinder. The numerical iso-surface temperature contours were obtained which enabled three-dimensional views of the flame propagation, the jet discharge, ignition and extinction events. The heat release process and regeneration of mid-range temperature iso-surfaces (1200 K) were not visible through the experimental images.

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Jet Plume Injection and Combustion

Cited by 37 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

A study of a turbulent jet ignition system fueled with iso-octane: Pressure trace analysis and combustion visualization

Large eddy simulation of a homogeneously charged turbulent jet ignition system

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