An experimental investigation of iso-octane ignition phenomena

Walton, S.M.; He, Xin; Zigler, Bradley T.; Wooldridge, Margaret S.; Atreya, Arvind

doi:10.1016/j.combustflame.2006.07.016

Cited by 125 publications

(77 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Following earlier studies of i-octane auto-ignition [24], Mansfield and Wooldridge [25] found that, with a 0.59 H 2 /0.41 CO/N 2 /air syngas mixture, at  = 0.5, became greater than unity at r T  ~-5 K/mm. With this gradient, an assumed hot spot radius, r o , of 3 mm, and E = 110.…”

Section: Onset Of Deflagrationmentioning

confidence: 85%

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

Bates

Bradley

Paczko

et al. 2016

Combustion and Flame

105

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: Onset Of Deflagrationmentioning

confidence: 85%

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

Bates

Bradley

Paczko

et al. 2016

Combustion and Flame

105

View full text Add to dashboard Cite

show abstract

“…The results showed that at 0.53 MPa IMEP the UHC and CO emissions were mainly distributed in the cylinder center and crevice regions. Walton et al [19] and Curran et al [20] have found that the equivalence ratio of the iso-octane ignition limit is about 0.2, where at equivalence ratios of ~0.2, iso-octane combustion is slow at engine-like conditions. Splitter [11] has also found that in gasoline/diesel RCCI combustion with premixed gasoline equivalence ratios below approximately 0.22, combustion mainly involves the direct injected diesel fuel and thus results in high UHC and CO emissions.…”

Section: Effects Of Premixed Ratios On Emissionsmentioning

confidence: 99%

Experimental and numerical investigations on the combustion and emission characteristics of an ethanol/diesel dual-fuel engine

Dong¹,

Cheng²,

Ou³

2017

Proceedings of the 2016 4th International Conference on Renewable Energy and Environmental Technology (ICREET 2016)

View full text Add to dashboard Cite

Abstract. Experiments and simulations were conducted to investigate the combustion and emission characteristics of ethanol/diesel dual-fuel combustion. The experiments were performed on a light-duty diesel engine with direct injection of diesel combined with port injection of ethanol. The results showed that the ethanol/diesel dual-fuel mode could reduce soot and NOx emissions simultaneously without EGR even at the higher load. However, the UHC and CO emissions of the ethanol/diesel dual-fuel mode increased gradually with the increase of ethanol proportion. Simulations showed that high UHC and CO emissions were formed in the crevice regions as well as cylinder center due to the lower reactivity of ethanol. It was also found that the cyclic variations of the ethanol/diesel dual-fuel mode increased gradually with the increase of premixed ratio at both loads. This was mainly due to the lower reactivity of ethanol.

show abstract

“…However, the data of Walton et al (2007a) considerably deviate from the data trend at lower temperatures. The presence of reaction fronts, as noted and explained by Walton et al (2007b), may have influenced these cases.…”

Section: High-pressure/low-temperature Syngas Ignition and Kinetic Immentioning

confidence: 99%

“…However, photographic image sequences shown in the studies of Walton et al (2007aWalton et al ( , 2007b) also indicate the presence of particles in the test volume. Particles have been observed to considerably affect the ignition process in rapid compression machine studies (Elsworth et al, 1969;.…”

Section: High-pressure/low-temperature Syngas Ignition and Kinetic Immentioning

confidence: 99%

Chemical Kinetics in Support of Syngas Turbine Combustion

Dryer¹

2007

View full text Add to dashboard Cite

Executive SummaryThis document is the final report on an overall program formulated to extend our prior work in developing and validating kinetic models for the CO/hydrogen/oxygen reaction by carefully analyzing the individual and interactive behavior of specific elementary and subsets of elementary reactions at conditions of interest to syngas combustion in gas turbines. A summary of the tasks performed under this work are: 1. Determine experimentally the third body efficiencies in H+O 2 +M = HO 2 +M (R1) for CO 2 Results are summarized in this document and its appendices. Three archival papers which contain a majority of the research results have appeared. Those results not published elsewhere are highlighted here, and will appear as part of future publications. Portions of the work appearing in the above publications were also supported in part by the Department of Energy under Grant No. DE-FG02-86ER-13503.As a result of and during the research under the present contract, we became aware of other reported results that revealed substantial differences between experimental characterizations of ignition delays for syngas mixtures and ignition delay predictions based upon homogenous kinetic modeling. We adjusted emphasis of Task 2 to understand the source of these noted disparities because of their key importance to developing lean premixed combustion technologies of syngas turbine applications. In performing Task 3, we also suggest for the first time the very significant effect that metal carbonyls may have on syngas combustion properties. This work is fully detailed in Appendix C. The work on metal carbonyl effects is entirely computational in nature. Pursuit of experimental verification of these interactions was beyond the scope of the present work.3 Results over this Progress Period ApproachThe present research further extended our prior work in developing and validating kinetic models for the CO/hydrogen/oxygen principally studied under Department of Energy Grant No. DE-FG02-86ER-13503, by providing additional experimental data using a Variable Pressure Flow Reactor (VPFR) on the collisional efficiencies of water and carbon dioxide in the reaction H+O 2 +M = HO 2 + M (R1) by carefully analyzing the individual and interactive behavior of specific elementary and subsets of elementary reactions at the conditions of interest, and by extending computational model comparisons with data obtained in this program and those appearing in the literature since 2004 to further test and refine the model at conditions relevant to gas turbine applications. Additionally, syngas contaminant species such as small hydrocarbons (e.g., methane) and other combustion gas components (e.g. NO x ) have been identified and it is suspected that these contaminants may affect syngas chemistry in gas turbine applications, particularly in mixing regions of entering fuel and air. These contaminants can have significant influence on some of the kinetic behavior. The initial research plan was to investigate only the effects of small local amo...

show abstract

An experimental investigation of iso-octane ignition phenomena

Cited by 125 publications

References 23 publications

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

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

Experimental and numerical investigations on the combustion and emission characteristics of an ethanol/diesel dual-fuel engine

Chemical Kinetics in Support of Syngas Turbine Combustion

Contact Info

Product

Resources

About