Assessment of flamelet versus multi-zone combustion modeling approaches for stratified-charge compression ignition engines

Pal, Pinaki; Keum, Seunghwan; Im, Hong G.

doi:10.1177/1468087415571006

Cited by 35 publications

(17 citation statements)

References 47 publications

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“…For combustion modeling, the SAGE detailed chemistry solver [47] was employed along with a multi-zone (MZ) approach, with bins of 5 K in temperature and 0.05 in equivalence ratio [48]. Although it does not utilize an explicit turbulent combustion closure [49,50], the SAGE-MZ model has been demonstrated to perform well for simulating spray combustion in the context of RANS in previous studies [51,52].…”

Section: Numerical Model Setupmentioning

confidence: 99%

Numerical Methodology for Optimization of Compression-Ignited Engines Considering Combustion Noise Control

Broatch¹,

Novella²,

Gómez-Soriano³

et al. 2018

SAE Int. J. Engines

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Section: Numerical Model Setupmentioning

confidence: 99%

Numerical Methodology for Optimization of Compression-Ignited Engines Considering Combustion Noise Control

Broatch¹,

Novella²,

Gómez-Soriano³

et al. 2018

SAE Int. J. Engines

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“…For combustion modelling, the SAGE detailed chemistry solver [39] was employed along with a multi-zone (MZ) approach, with bins of 5 K in temperature and 0.05 in equivalence ratio [40]. This combustion model, despite not using an explicit turbulent combustion closure [17], has demonstrated to perform well for simulating spray combustion under URANS schemes in previous works [41]. A reduced chemical kinetic mechanism for primary reference fuels (PRF) based on Brakora et al [42] was used in this work to account for fuel chemistry.…”

Section: Numerical Model Set-upmentioning

confidence: 99%

Computational Methodology for Knocking Combustion Analysis in Compression-Ignited Advanced Concepts

2018

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In the present work, a numerical methodology based on three-dimensional (3D) computational fluid dynamics (CFD) was developed to predict knock in a 2-Stroke engine operating with gasoline Partially Premixed Combustion (PPC) concept. Single-cycle Unsteady Reynolds-Averaged Navier Stokes (URANS) simulations using the renormalization group (RNG) k − ε model were performed in parallel while the initial conditions are accordingly perturbed in order to imitate the variability in the in-cylinder conditions due to engine operation. Results showed a good agreement between experiment and CFD simulation with respect to cycle-averaged and deviation of the ignition timing, combustion phasing, peak pressure magnitude and location. Moreover, the numerical method was also demonstrated to be capable of predicting knock features, such as maximum pressure rise rate and knock intensity, with good accuracy. Finally, the CFD solution allowed to give more insight about in-cylinder processes that lead to the knocking combustion and its subsequent effects.In particular, PPC operated with low reacting fuels, such as gasoline, have shown encouraging results to achieve very low pollutant emissions while maintaining, or even improving, the thermal efficiency [10][11][12]. Indeed, this combustion concept operated in an innovative 2-Stroke high speed direct injection (HSDI) compression-ignited (CI) engine [13] offers a good flexibility to control the combustion timing and to extent the load range [14][15][16].This concept operates between completely premixed and fully diffusive conditions, whereby low pollutant emissions may be attained. However, to achieve these conditions while retaining an accurate combustion timing control with the injection event remains as the main drawback of this particular system when operating under transient conditions.Despite the attractive benefits of this engine system, its complexity due to the large number of parameters to be managed requires the use of optimization techniques which ensure greater flexibility, speed and lower costs than purely experimental procedures.In this framework, the use of computational fluid dynamics (CFD) simulations is nowadays widely established in both the research community and the automotive industry. Here, aspects such as the simulation of turbulence and how it couples with the chemistry [17] are still the main limiting factors for reproducing the reacting flow field accurately. Since the requirements in both fields tend to differ, specially in terms of time available, the approaches used are also usually different. While in the industry sector, simulations are based on Unsteady Reynolds-averaged Navier-Stokes (URANS) turbulence modelling [18,19] and flamelet-based combustion models [20] owing its lower computational demands, the research community prefer to resort to high-fidelity combustion models and more complex turbulence schemes such as Large Eddy Simulations (LES) [21] or Direct Numerical Simulations (DNS) [22].Although the industry standard tends to simplify the simulatio...

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“…In other words, comparing to the conventional Diesel combustion, as generally PPCI ignition occurs much later than end of injection, scalar dissipation rate in the air-fuel mixture drops to very low values and gets very close to well-mixed assumption. This is why many researchers reported that results of the models with embedded sub-grid scale turbulent mixing do not differ a lot when compared to the well-mixed combustion models [14,13].…”

Section: Combustion Modelmentioning

confidence: 99%

“…It has been concluded that for all the injection timings and operating cases ignition was started from the highest local concentration of the n-heptane. Pal et al [13] investigated PPCI combustion using extended RIF model including spray evaporation effects in reaction space in conjunction with multi-zone well-mixed model. It was concluded that applied models have almost similar results under low air-fuel stratification condition, however, flamelet based model had more accurate results under high fuel stratification levels.…”

Section: Pfl-0690 Introductionmentioning

confidence: 99%

Numerical Investigation of PPCI Combustion at Low and High Charge Stratification Levels

Maghbouli¹,

Lucchini²,

D’Errico³

et al. 2017

SAE Technical Paper Series

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The authors need to carefully proofread their manuscript for grammatical errors. The articles "a" , "an" and "the" are either missing or unnecessarily inserted throughout the paper. A few examples include: Abstract, 1st sentence:insert "the" before 'low temperature combustion' (also, a note on capitalization-even though the abbreviation is capitalized, the full words are not) Abstract, 3rd sentence:insert "the" between 'lowers' and 'rate of heat release' Introduction, 1st sentence:delete 'been' and insert "a" after 'triggered' (see earlier note on capitalization as it also applies to 'internal combustion') Be sure to double check for spelling errors as well.(Caption for Fig. 8 on p. 7:"startification" should be spelled "stratification", and p. 9 last paragraph "fist" should be spelled "first" and "form" should be spelled "from") Some sentences are confusing and need to be clarified. A few examples include: P. 2 paragraph after Table 1: "Izadi et al. [8] found that ignition sensitivity for the experiments as in Fig. 1."This could be edited many ways, but it seems like the authors meant to insert a clause describing some notable result from [8] before the phrase "as in Fig. 1." P. 9 Second to last sentence in the "SOI-40" paragraph:"This is due to availability of larger amount of fuel in SOI-80 while second stage ignition." Thanks for the detailed observation of Reviewer 1. We have amended the manuscript text accordingly. Overall, this CFD paper helps to explain the experimental results observed in SAE Technical Paper 2016-01-0761. Note that I had to search for this paper number because the references section does not list the paper number for [8]. The authors need to be cautious about making broader, unproven claims that air-fuel mixture stratification can effectively control PPCI combustion phasing "under different engine operating conditions" (last sentence of abstract) when they only investigated a single, low-load operating condition. Abstract was changed. Please check. The authors acknowledge, in the last sentence of the second paragraph of the Introduction, that "There have note the correction from "has" to "have" been a number of experimental and numerical studies on the effect of mixture stratification on note the deletion of unnecessary article "the" PPCI combustion characteristics", so given that they are aware of other relevant papers it would be pertinent and informative to briefly review/compare/contrast (cite!) these works in the Introduction and discussion of their own results. There was a misunderstanding in the first draft. After this sentence both experimental and numerical literature review were provided. Please check.

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Assessment of flamelet versus multi-zone combustion modeling approaches for stratified-charge compression ignition engines

Cited by 35 publications

References 47 publications

Numerical Methodology for Optimization of Compression-Ignited Engines Considering Combustion Noise Control

Numerical Methodology for Optimization of Compression-Ignited Engines Considering Combustion Noise Control

Computational Methodology for Knocking Combustion Analysis in Compression-Ignited Advanced Concepts

Numerical Investigation of PPCI Combustion at Low and High Charge Stratification Levels

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