Minor Species Production from Lean Premixed Combustion and Their Impact on Autoignition of Diesel Surrogates

Nesbitt, Jaclyn E.; Johnson, Sture A. M.; Pickett, Lyle M.; Siebers, Dennis L.; Lee, Seong-Young; Naber, Jeffrey

doi:10.1021/ef101411f

Cited by 22 publications

(11 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One can notice that the agreement is really good for the reduced mechanism compared to the detailed one at different equivalence ratios and ambient temperatures. However, the mechanism has not been evaluated in the presence of minor species for different oxygen concentrations of interest in 3D simulations, although 0D calculated results suggest the significance of minor species [7,15,23]. The authors acknowledge this shortcoming; however, further mechanism development is beyond the scope of this study.…”

Section: Modeling Methodsmentioning

confidence: 98%

See 1 more Smart Citation

Engine Combustion Network (ECN): Global sensitivity analysis of Spray A for different combustion vessels

Pei

Davis

Pickett

et al. 2015

Combustion and Flame

Self Cite

View full text Add to dashboard Cite

a b s t r a c tGlobal sensitivity analysis was conducted on Spray A of the Engine Combustion Network's (ECN) experimental conditions across different combustion vessels from different institutions. The main objective was to understand the influence of differences in boundary conditions on specific targets of interest. A list of experimental initial, boundary, and injection conditions with uncertainty ranges were identified for three different ambient conditions for these combustion vessels. Five targets including the liquid length, vapor penetration length, ignition delay, lift-off length, and soot mass in the domain were extracted from hundreds of 3D computational fluid dynamics (CFD) simulations by simultaneously perturbing all the uncertain variables. Each target was analyzed using a global sensitivity analysis (GSA) method and the relative importance of different variables towards specific targets was identified. The uncertainty in the fuel temperature was found to have a profound influence on the liquid length, however, the influence on vapor penetration length, ignition delay, and lift-off length, was rather subtle. Small uncertainties in the initial turbulence level and nozzle diameter was observed to have a significant influence on the vapor penetration. Variables sensitive to ignition delay also showed similar sensitivity to flame lift-off length. The soot mass in the domain was observed to have a closer correlation with the liquid length at least for higher ambient temperature conditions.

show abstract

Section: Modeling Methodsmentioning

confidence: 98%

“…In terms of the minor species, only OH is considered in this study, and the values were approximated from chemical kinetics calculations given in Refs. [15,23]. The mass flow rate of injection is affected by several parameters in addition to injection pressure, which in turn affects key spray and combustion targets.…”

Section: Uncertain Variablesmentioning

confidence: 99%

Engine Combustion Network (ECN): Global sensitivity analysis of Spray A for different combustion vessels

Pei

Davis

Pickett

et al. 2015

Combustion and Flame

Self Cite

View full text Add to dashboard Cite

show abstract

“…In CVP vessels, major and minor products are generated in the post-burn stage. Several studies [3,13,14] pointed out the potential effects of these species on the spray ignition, lift-off length and the soot oxidation.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the ECN spray A in different facilities. Part 1: boundary conditions characterization

Houidi

Hespel

Bardi

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

The Engine Combustion Network (ECN) community has greatly contributed to improve the fundamental understanding of spray atomization and combustion at conditions relevant to internal combustion engines. In this context, standardized spray experiments have been defined to facilitate the comparison of experimental and simulation studies performed in different facilities and with different models. This operating mode promotes collaborations among research groups and accelerates the advancement of research on spray. In efforts to improve the comparability of the ECN spray A experiments, it is of high importance to review the boundary conditions of different devices used in the community. This work is issued from the collaboration in the ECN France project, where two new experimental facilities from PPRIME (Poitiers) and PRISME (Orleans) institutes are validated to perform spray A experiments. The two facilities, based on Rapid Compression Machine (RCM) design, have been investigated to characterize their boundary conditions (e.g., flow velocity as well as fuel and gas temperatures). A set of standardized spray experiments were performed to compare their results with those obtained in other facilities, in particular the Constant Volume Pre-burn (CVP) vessel at IFPEN. It is noteworthy that it is the first time that RCM type facilities are used in such a way within the ECN. This paper (part 1) focuses on the facilities description and the fine characterization of their boundary conditions. A further paper (part 2) will present the results obtained with the same facilities performing ECN standard spray A characterizations. The reported review of thermocouple thermometry highlights that it is necessary to use thin-wires and bare-bead junction as small as possible. This would help to measure the temperature fluctuations with a minimal need for error corrections, which are highly dependent on the proper estimation of the velocity through the junction, and therefore it may introduce important uncertainties. Temperature heterogeneities are observed in all spray A devices. The standard deviation of the temperature distribution at the time of injection is approximately 5%. We report time-resolved temperature measurement from PPRIME RCM, performed in the near nozzle area during the injection. In inert condition, colder gases from the boundary layer are entrained toward the mixing area of the spray causing a further deviation from the target temperature. This emphasizes the importance of the temperature in the boundary (wall) layer. In reacting condition, the temperature of these entrained gases increases by the effect of the increased pressure, as the RCM has a relatively small volume. Generally, the velocity and turbulence levels are an order of magnitude higher in RCM and constant pressure flow compared to CVP vessels. The boundary characterization presented here will be the base for discussing spray behavior in the part 2 of this paper.

show abstract

“…During the pre-combustion, the combustion products (CO 2 , H 2 O, Ar, N 2 and O 2 ) and some minor species (NO, NO 2 and OH) are present in the ambient gases when the injection starts [6]. This does not affect the spray process itself but certainly the combustion process, as the ignition delay, the lift-off Engine Combustion Network -France Christine Rousselle and Gilles Bruneaux (Guest editors) length, the soot production and oxidation [9][10][11]. For example, Nesbitt et al [9] found that both major (CO 2 , H 2 O, O 2 ) and minor species (NO, NO 2 , OH) influence the ignition delay and the changes due to minor species are small relative to those from major species.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the ECN spray A in different facilities. Part 2: spray vaporization and combustion

Hespel

Houidi

Ajrouche

et al. 2020

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

View full text Add to dashboard Cite

One of the objective of Engine Combustion Network (ECN), (https://ecn.sandia.gov/) is to provide experimental results with high accuracy in order to validate model and reach new steps in scientific understanding of spray combustion at conditions specific to engines. The ECN community defines different target conditions, experimental diagnostics and post processing methods to facilitate the comparison of experimental and simulations studies performed in different facilities or models. In this context two French laboratories propose two new facilities, based on Rapid Compression Machines to reach the ECN spray A conditions. In this paper, the results of liquid and vapour spray penetration as well as Ignition Delay (ID) and Lift-Off Length (LOL) obtained with these Rapid Compression Machines are compared to the results obtained in the Constant Volume Preburn (CVP) vessel of IFPEN. The specificities of each experimental apparatus allow to bring complementary elements of understanding like confinement effects. In non-reactive condition, the liquid and vapour sprays were characterized by Diffused-Back Illumination and Schlieren technique, and in reactive conditions, the LOL and the ID by OH* chemiluminescence. The analysis of the results with regard to the boundary conditions (temperature, velocity, confinement) make it possible to validate these two new facilities and contribute to enhance the database of ECN, highlighting the confinement effect typical of piston engine operation.

show abstract

Minor Species Production from Lean Premixed Combustion and Their Impact on Autoignition of Diesel Surrogates

Cited by 22 publications

References 49 publications

Engine Combustion Network (ECN): Global sensitivity analysis of Spray A for different combustion vessels

Engine Combustion Network (ECN): Global sensitivity analysis of Spray A for different combustion vessels

Characterization of the ECN spray A in different facilities. Part 1: boundary conditions characterization

Characterization of the ECN spray A in different facilities. Part 2: spray vaporization and combustion

Contact Info

Product

Resources

About