Detailed measurements of transient two-stage ignition and combustion processes in high-pressure spray flames using simultaneous high-speed formaldehyde PLIF and schlieren imaging

Sim, Hyung Sub; Maes, Noud; Weiß, Lukas; Pickett, Lyle M.; Skeen, Scott A.

doi:10.1016/j.proci.2020.09.026

Cited by 36 publications

(14 citation statements)

References 26 publications

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“…Especially when the flame lift-off length increases, such differences may lead to an asymmetry in the flame. This does seem to be the case, and is supported with the formaldehyde structures observed at the lowest ambient temperature in recent work [37]. The top-most measurement point in the middle panel of Fig.…”

Section: Vessel Temperature Distribution After the Pre-burnsupporting

confidence: 88%

“…The ECN Spray A conditions are investigated in this numerical study [15]. N-dodecane is injected through the new Spray A-3 injector at 150 MPa [37], in a computational domain representative of the real vessel geometry (illustrations of the geometry can be found in Refs. [25,38]).…”

Section: Methodsmentioning

confidence: 99%

“…Table 2 shows a more detailed comparison of first-and secondstage ignition between the simulations and the experiments. First-stage ignition is defined following the experimental procedure proposed by Sim et al [37], who performed high-speed formaldehyde PLIF to capture the low-temperature combustion product over time. They used the same test conditions and injector as in this study.…”

Section: Reacting Simulationsmentioning

confidence: 99%

“…First and second stage ignition delay comparison between simulations performed with and without uniform temperature profile, and experiments[37].…”

mentioning

confidence: 99%

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Considerations for the temperature stratification in a pre-burn constant-volume combustion chamber

Maes

Tagliante

Sim

et al. 2023

Experimental Thermal and Fluid Science

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Section: Vessel Temperature Distribution After the Pre-burnsupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: Reacting Simulationsmentioning

confidence: 99%

“…First and second stage ignition delay comparison between simulations performed with and without uniform temperature profile, and experiments[37].…”

mentioning

confidence: 99%

See 2 more Smart Citations

Considerations for the temperature stratification in a pre-burn constant-volume combustion chamber

Maes

Tagliante

Sim

et al. 2023

Experimental Thermal and Fluid Science

Self Cite

View full text Add to dashboard Cite

“…The flame structures obtained by the two approaches show an overall close agreement which is also preserved at 1.00 ms ASOI, where parts of the flame are in a steady state. A slight difference in the length of moderate temperature along the spray axis is observed at this time which is potentially caused by a periodic detachment of fuel-rich mixtures [61] after the second-stage ignition. It can be concluded, that neglecting the unstable branch of the S-curve is a suitable assumption for the ECN Spray A baseline conditions.…”

Section: A-posteriori Analysismentioning

confidence: 87%

Evaluation of the unsteady flamelet progress variable approach in Large Eddy Simulations of the ECN Spray A

Gierth

Haspel

Scholtissek

et al. 2022

STET

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Within the Unsteady Flamelet Progress Variable – Large Eddy Simulation (UFPV-LES) approach the local scalar dissipation rate represents one key parameter, significantly affecting the ignition behaviour. In this study, the UFPV-LES approach is evaluated for ECN Spray A baseline conditions, relevant for diesel engines. After confirming its general applicability, using experimental data under non-reacting and reacting conditions, special attention is paid to the distribution of the local scalar dissipation rate. Based on the findings of this analysis, a reduced modeling approach, considering only igniting flamelets starting from the adiabatic mixing line between the fuel and oxidizer, is investigated. The performance of this reduced approach is assessed systematically, using the UFPV-LES results as a reference. Based on an a-priori analysis, regions affected by the model reduction are identified and evaluated. A subsequent evaluation in an a-posteriori analysis, i.e. a coupled LES, reveals similar results in terms of local flame structure as well as global ignition characteristics and confirms the applicability of the reduced model under the ECN Spray A baseline conditions.

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The ignition characteristics of dual-fuel spray at different ambient methane concentrations under engine-like conditions

Wei

Zhang²,

Li³

et al. 2023

Applied Thermal Engineering

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Detailed measurements of transient two-stage ignition and combustion processes in high-pressure spray flames using simultaneous high-speed formaldehyde PLIF and schlieren imaging

Cited by 36 publications

References 26 publications

Considerations for the temperature stratification in a pre-burn constant-volume combustion chamber

Considerations for the temperature stratification in a pre-burn constant-volume combustion chamber

Evaluation of the unsteady flamelet progress variable approach in Large Eddy Simulations of the ECN Spray A

The ignition characteristics of dual-fuel spray at different ambient methane concentrations under engine-like conditions

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