Performance of Multiple Stream Pulsed Jet Combustion Systems

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

doi:10.4271/910565

Cited by 42 publications

(8 citation statements)

References 10 publications

(4 reference statements)

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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]. Ultra-lean mixtures of λ=2.22 could be ignited by JPIC, while the lean limit for spark ignition was determined to be λ=1.53.…”

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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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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“…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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“…The turbulent jet of the TJI system has a similar structure to the Pulsed Jet Combustion (PJC) system [24]. Maxson et al [25] defined the three stages for the PJC process as the "jet", the "plume" and the "puff". The "jet" is defined as the initial core of the jet that consists of the incomplete combustion products at high temperature in which the mixing is disabled by shear at the orifice exit.…”

Section: Introductionmentioning

confidence: 99%

“…The triple orifice system showed better performance. They also investigated the performance of two simultaneously opposed jets and observed a higher rate of pressure rise with the opposed jet system in contrast to the single jet [25].…”

Section: Introductionmentioning

confidence: 99%

Rapid compression machine study of a premixed, variable inlet density and flow rate, confined turbulent jet

Gholamisheeri

Thelen

Gentz

et al. 2016

Combustion and Flame

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The behavior of transient, compressible and combusting pre-mixed methane-air jets was experimentally studied with high speed imaging in a rapid compression machine. The jets were generated with a turbulent jet ignition system, which is a prechamber initiated combustion system. The absence of physical analyses of the characteristics of premixed turbulent jets was the motivation for the present study. Experiments were completed for turbulent jet ignition system orifice diameters of 2.0, 2.5 and 3.0 mm each at lean-to-stoichiometric equivalence ratios of φ=0.67, 0.8 and 1.0. The hot jet velocity at the orifice exit was calculated using mathematical correlations. The Mach number and Reynolds number were also computed. The high speed imaging shows the influence of orifice diameter on the flame propagation and the shape and structure of vortices resulting from the turbulent jet. Results revealed a direct relationship between orifice exit area reduction and a decrease in hot jet penetration speed. There was a reduction in hot jet penetration speed with an increase in the equivalence ratio. For the orifice diameters and equivalence ratios tested here, results showed that the jet evolved downstream of the orifice exit in partial agreement with existing correlations. Moreover, the jet was turbulent with calculated Reynolds numbers of around 20,000 or greater.

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Performance of Multiple Stream Pulsed Jet Combustion Systems

Cited by 42 publications

References 10 publications

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

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

Rapid compression machine study of a premixed, variable inlet density and flow rate, confined turbulent jet

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