Influence of autoignition delay time characteristics of different fuels on pressure waves and knock in reciprocating engines

Bradley, D.; Kalghatgi, GT Gautam

doi:10.1016/j.combustflame.2009.08.003

Cited by 175 publications

(95 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…1. In the very early stages of knock, originating at a single hot spot, the amplitude of the pressure pulse is proportional to 2   [38]. The low values of   r T E   ln -tend to confirm that combustion was in the auto-ignitive mode.…”

Section: Engine Performance and The Detonation Peninsulamentioning

confidence: 96%

See 1 more Smart Citation

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

Bates

Bradley

Paczko

et al. 2016

Combustion and Flame

114

View full text Add to dashboard Cite

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.

show abstract

Section: Engine Performance and The Detonation Peninsulamentioning

confidence: 96%

“…Conditions F, G, I, and J represent super-knock, associated with auto-ignitive pre-ignition [38], and subsequent strong developing detonations.…”

Section: Engine Performance and The Detonation Peninsulamentioning

confidence: 99%

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

Bates

Bradley

Paczko

et al. 2016

Combustion and Flame

114

View full text Add to dashboard Cite

show abstract

“…80 It is interesting to note that up to 2011, no LES studies on engine knock were published at all, as pointed out by Rutland. 14 Since then, some initial attempts to model engine knock using LES have been reported. [84][85][86] Although significant improvements have been achieved in describing the fluid flow, mixture formation and the combustion process leading to end-gas auto-ignition, knock prediction was still only qualitative since auto-ignition is only a necessary but not a sufficient criterion for knock, as pointed out in a series of articles by Bradley et al, 87 Gu et al, 88 Bradley and Kalghatgi 89 and Kalghatgi and Bradley. 90 The first promising works to predict engine knock were published only recently.…”

Section: Knock and Abnormal Combustionmentioning

confidence: 99%

Scale-resolving simulations in engine combustion process design based on a systematic approach for model development

Hasse

2015

International Journal of Engine Research

View full text Add to dashboard Cite

The increasing availability of high-performance computing resources will allow scale-resolving simulations such as large eddy simulations to be used instead of unsteady Reynolds-averaged Navier-Stokes approaches, not only in academic research but also for engine combustion process development. The scope of this work is to highlight and discuss this transition to scale-resolving simulations and to propose a systematic approach for model development and application. The current and future scope of industrial and academic research is discussed especially with respect to cycle-to-cycle variations, which cannot be identified with unsteady Reynolds-averaged Navier-Stokes models. The individual processes along the cause-and-effect chain leading to cyclic variations of the combustion process are identified, and the current state of scale-resolving simulations and the required models with respect to these processes are discussed.

show abstract

“…Data points indicated by are from a rapid compression machine, in which maximum knock pressure amplitudes varied as  -1.923 , close to the estimate of  -2 in [26]. The diverse operational conditions show that entry into the detonation peninsula is associated with the onset of knock, which can become severe (1) arise partly from the greater charge cooling that arises in modern engines, and partly from the smaller inverse exponent for, non-PRF, realistic fuels [1,3], that determines the effect of pressure on i  .…”

Section:   / Diagram For Different Enginesmentioning

confidence: 99%

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

Bates

Bradley

2017

Combustion and Flame

Self Cite

View full text Add to dashboard Cite

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

show abstract

Influence of autoignition delay time characteristics of different fuels on pressure waves and knock in reciprocating engines

Cited by 175 publications

References 37 publications

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

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

Scale-resolving simulations in engine combustion process design based on a systematic approach for model development

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

Contact Info

Product

Resources

About