Investigating the Effect of Spray Targeting and Impingement on Diesel Engine Cold Start

Lippert, Andreas; Stanton, Donald W.; Reitz, Rolf D.; Rutland, Christopher J.; Hallett, William L.H.

doi:10.4271/2000-01-0269

Cited by 46 publications

(19 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The maximum 3 ϩ is smaller for the MC-fuel drop-laden layer, indicating that a wide spread molar-weight liquid-fuel composition may globally impede vorticity production; this conclusion is consistent with the vorticity and vorticity-magnitude budget analyses. Although the general level of vorticity activity is higher in the SC-fuel layer, locally one observes considerably more numerous high vorticity regions for the MC-fuel mixing layer.…”

Section: Vorticitysupporting

confidence: 78%

“…The indications are that the MC layers achieve a slightly reduced small-scale formation than their SC counterpart. A similar behavior to that of 3 ϩ is portrayed in Fig. 4͑c͒ for the enstrophy, but we note that these indications pertain only to the attained maxima and are reversed past the culminating point of the curves.…”

Section: B Global Layer Evolution and Transition Attainmentmentioning

confidence: 62%

“…where the summations are over all drops residing within a local numerical discretization volume ⌬x 3 . h v,s ϭC l T s ϩL v is the enthalpy of the evaporated species.…”

Section: Source Termsmentioning

confidence: 99%

“…Despite the preponderance of multicomponent ͑MC͒ fuels, the specific behavior of such sprays in turbulent flows is not well understood when compared to that of single-component ͑SC͒ fuel sprays. For example, because of the daunting difficulty of simulating MC mixtures, investigators use a variety of heavy ͑i.e., large molar weight͒ SCs or mixtures of two fuels to simulate diesel fuel, [1][2][3][4] although there is emerging interest in a complete MC representation. 5 Also, because data obtained with SC fuels lead to results that are more easily interpretable, some experiments tend to focus on SC fuels as well, although the ultimate interest is on MC fuels.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Direct numerical simulation of a transitional temporal mixing layer laden with multicomponent-fuel evaporating drops using continuous thermodynamics

Clercq

Bellan

2004

Physics of Fluids

View full text Add to dashboard Cite

A model of a temporal three-dimensional mixing layer laden with fuel drops of a liquid containing a large number of species is derived. The fuel model is based on continuous thermodynamics, whereby the composition is statistically described through a distribution function parametrized on the species molar weight. The drop temperature is initially lower than that of the carrier gas, leading to drop heat up and evaporation. The model describing the changes in the multicomponent ͑MC͒ fuel drop composition and in the gas phase composition due to evaporation encompasses only two more conservation equations when compared with the equivalent single-component ͑SC͒ fuel formulation. Single drop results of a MC fuel having a sharply peaked distribution are shown to compare favorably with a validated SC-fuel drop simulation. Then, single drop comparisons are performed between results from MC fuel and a representative SC fuel used as a surrogate of the MC fuel. Further, two mixing layer simulations are conducted with a MC fuel and they are compared to representative SC-fuel simulations conducted elsewhere. Examination of the results shows that although the global layer characteristics are generally similar in the SC and MC situations, the MC layers display a higher momentum-thickness-based Reynolds number at transition. Vorticity analysis shows that the SC layers exhibit larger vortical activity than their MC counterpart. An examination of the drop organization at transition shows more structure and an increased drop-number density for MC simulations in regions of moderate and high strain. These results are primarily attributed to the slower evaporation of MC-fuel drops than of their SC counterpart. This slower evaporation is due to the lower volatility of the higher molar weight species, and also to condensation of already-evaporated species on drops that are transported in regions of different gas composition. The more volatile species released in the gas phase earlier during the drop lifetime reside in the lower stream while intermediary molar weight species, which egress after the drops are entrained in the mixing layer, reside in the mixing layer and form there a very heterogeneous mixture; the heavier species that evaporate later during the drop lifetime tend to reside in regions of high drop number density. This leads to a segregation of species in the gas phase based on the relative evaporation time from the drops. The ensemble-average drop temperature becomes eventually larger/smaller than the initial drop temperature in MC/SC simulations. Neither this species segregation nor the drop temperature variation with respect to the initial temperature or as a function of the mass loading can be captured by the SC-fuel simulations.

show abstract

Section: Vorticitysupporting

confidence: 78%

Section: B Global Layer Evolution and Transition Attainmentmentioning

confidence: 62%

“…where the summations are over all drops residing within a local numerical discretization volume ⌬x 3 . h v,s ϭC l T s ϩL v is the enthalpy of the evaporated species.…”

Section: Source Termsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Direct numerical simulation of a transitional temporal mixing layer laden with multicomponent-fuel evaporating drops using continuous thermodynamics

Clercq

Bellan

2004

Physics of Fluids

View full text Add to dashboard Cite

show abstract

“…Lippert et al [42] promote an approach that employs a continuous probability density function to accurately capture the entire range of fuel components. However, this will lead to an inconsistency once the fuel evaporates if the gas phase chemistry is subsequently represented by a discrete set of components.…”

Section: Spray/multicomponent Vaporization Modelsmentioning

confidence: 99%

Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels

Farrell¹,

Cernansky²,

Dryer³

et al. 2007

SAE Technical Paper Series

325

241

View full text Add to dashboard Cite

Diesel and DieselLTCCombustion

Andersson

Miles

2014

Encyclopedia of Automotive Engineering

View full text Add to dashboard Cite

Conventional and low temperature diesel combustion systems are reviewed from a broad perspective, beginning with a summary of practical design considerations. This material will provide practicing engineers a comprehensive review, and for those new to the field, an overview of what is essential and references for further information. The practical considerations are followed by a description of the fundamental physical processes controlling the combustion process. With this background, an overview of the evolution of the combustion process is provided and the impact of various design parameters on this evolution is discussed. Our objective is to provide the combustion system designer a strong physical understanding to guide his development of modern, low emission, high efficiency diesel combustion systems.

show abstract

Investigating the Effect of Spray Targeting and Impingement on Diesel Engine Cold Start

Cited by 46 publications

References 59 publications

Direct numerical simulation of a transitional temporal mixing layer laden with multicomponent-fuel evaporating drops using continuous thermodynamics

Direct numerical simulation of a transitional temporal mixing layer laden with multicomponent-fuel evaporating drops using continuous thermodynamics

Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels

Diesel and DieselLTCCombustion

Contact Info

Product

Resources

About