Analysis of pre-ignition in highly charged SI engines: Emphasis on the auto-ignition mode

Rudloff, Jordan; Zaccardi, Jean-Marc; Richard, Stéphane; Anderlohr, Jörg

doi:10.1016/j.proci.2012.05.005

Cited by 100 publications

(58 citation statements)

References 8 publications

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“…Following the earlier employment of the detonation peninsula [5][6][7][8][9][10], it has been used in a combined experimental engine and LES study to demonstrate how increasing spark advance, and the associated increasingly severe engine knock, cause the corresponding engine cycle loci to cross the threshold into the detonation peninsula [30].…”

Section: Engine Performance and The Detonation Peninsulamentioning

confidence: 99%

“…The boundaries were defined by the dimensionless groups, a/u a , and This approach has been employed in studies of engine knock and super-knock in gasoline engines [5][6][7][8][9][10]. The phenomena leading to super-knock are a rather complex sequence of events comprising the primary formation of hot spots that pre-ignite and initiate premature flame propagation, with earlier increases in pressure and temperature in the unburned mixture.…”

Section: Introductionmentioning

confidence: 99%

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Engine hot spots: Modes of auto-ignition and reaction propagation

Bates

Bradley

Paczko

et al. 2016

Combustion and Flame

111

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expresses the influences of hot spot temperature gradient and fuel characteristics, and a unique value of it might serve as a boundary between auto-ignitive and deflagrative regimes. Other combustion regimes can also be identified, including a mixed regime of both auto-ignitive and "normal" 2 deflagrative burning. The paper explores the performances of a number of different engines in the regimes of controlled auto-ignition, normal combustion, combustion with mild knock and, ultimately, super-knock. The possible origins of hot spots are discussed and it is shown that the dissipation of turbulent energy alone is unlikely to lead directly to sufficiently energetic hot pots. The knocking characterisation of fuels also is discussed.

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Section: Engine Performance and The Detonation Peninsulamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Engine hot spots: Modes of auto-ignition and reaction propagation

Bates

Bradley

Paczko

et al. 2016

Combustion and Flame

111

View full text Add to dashboard Cite

show abstract

“…Table 2 gives the symbols for type of engine, sources of data, the fuels, auto-ignitive modes, maximum pressures and temperatures. Some data are new [19,20], some have been employed in earlier studies [1,[21][22][23][24][25]. Engine types included controlled auto-ignition, conventional spark ignition, turbo charged, and a rapid compression machine, RCM.…”

Section:   / Diagram For Different Fuelsmentioning

confidence: 99%

Deflagrative, auto-ignitive, and detonative propagation regimes in engines

Bates

Bradley

2017

Combustion and Flame

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The paper presents a novel overall quantitative description of the major regimes of engine combustion, covering the influences of both turbulence and auto-ignition parameters on burn rates and flame extinctions. It involves two separate, yet interconnected, correlation diagrams. The first involves the normalised turbulent burning velocity, the Karlovitz stretch factor the strain rate Markstein number, and also includes possible the relative auto-ignitve burn rates. The second is a complementary correlating

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“…Theoretically, the auto ignition that occurs in a pre-ignition event is attributed to the reaction centers -"hot spots" caused by temperature gradient [25]. This study reports that pre-ignition due to hot spots is not only due to end gas reaction, but also due to thermodynamic conditions that couples acoustic pressure waves with reaction front.…”

Section: Effect Of Timing and Location Of Hotspot On Super Knock Durimentioning

confidence: 93%

Effect of Timing and Location of Hotspot on Super Knock during Pre-ignition

Ali

Pérez

Vedharaj

et al. 2017

SAE Technical Paper Series

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Pre-ignition in SI engine is a critical issue that needs addressing as it may lead to super knock event. It is widely accepted that pre-ignition event emanates from hot spot(s) that can be anywhere inside the combustion chamber. The location and timing of hotspot is expected to influence the knock intensity from a pre-ignition event. In this study, we study the effect of location and timing of hot spot inside the combustion chamber using numerical simulations. The simulation is performed using a three-dimensional computational fluid dynamics (CFD) code, CONVERGE™. We simulate 3-D engine geometry coupled with chemistry, turbulence and moving structures (valves, piston). G-equation model for flame tracking coupled with multi-zone model is utilized to capture auto-ignition (knock) and solve gas phase kinetics. A parametric study on the effect of hot spot timing and location inside the combustion chamber is performed. The hot spot timing considered are -180 CAD, -90 CAD and -30 CAD and the locations of the hot spots are in the center and two edges of the piston surfaces. Simulation results for normal combustion cycle are validated against the experimental data. The simulation results show great sensitivity to the hot spot timing, and the influence of local temperature gradient is noted to be significant. In case of early hot spot timing of -180 CAD, the pre-ignition event did not lead to super knock. Nevertheless, at late hot spot timing, super knock was realized. On the other hand, the effect of hot spot location on pre-ignition event depends on the geometry of the combustion chamber.

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Analysis of pre-ignition in highly charged SI engines: Emphasis on the auto-ignition mode

Cited by 100 publications

References 8 publications

Engine hot spots: Modes of auto-ignition and reaction propagation

Engine hot spots: Modes of auto-ignition and reaction propagation

Deflagrative, auto-ignitive, and detonative propagation regimes in engines

Effect of Timing and Location of Hotspot on Super Knock during Pre-ignition

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