Soot Formation Modeling of<i>n</i>-Heptane Sprays Under Diesel Engine Conditions Using the Conditional Moment Closure Approach

Bolla, Michele; Wright, Yuri M.; Boulouchos, Konstantinos; Borghesi, Giulio; Mastorakos, Epaminondas

doi:10.1080/00102202.2012.752362

Cited by 72 publications

(55 citation statements)

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“…Among them, the semi-empirical models [3,4] are the most popular ones. This type of model is also used for soot-turbulence interactions as in Bolla et al [5]. It is usually based on two equations giving access to a limited number of http informations (total mass, mean diameter, .…”

Section: Introductionmentioning

confidence: 99%

Sectional soot model coupled to tabulated chemistry for Diesel RANS simulations

Aubagnac-Karkar

Michel

Colin

et al. 2015

Combustion and Flame

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Section: Introductionmentioning

confidence: 99%

Sectional soot model coupled to tabulated chemistry for Diesel RANS simulations

Aubagnac-Karkar

Michel

Colin

et al. 2015

Combustion and Flame

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“…Further to the investigations reported in [22][23][24] using the composition PDF approach, this study employs a well-proven CMC combustion model [16][17][18][19][20][21]36] in conjunction with an embedded soot model [37] to study the impact of neglecting TCI with particular emphasis on emissions. The present investigation additionally seeks to elucidate the reasons behind the apparent success of neglecting TCI by examining the predicted ignition delays, LOLs and soot distributions for a variety of diesel engine relevant conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Magnussen's eddy dissipation) [11,12]. With the development of the flamelet model in the 1990s, more advanced turbulent combustion theories started to appear in the field of diesel engine computational fluid dynamics (CFD) [13][14][15], and more recently, all advanced combustion models are being used: CMC [16][17][18][19][20][21], PDF [22][23][24][25], partially stirred reactor [26], generalised flame surface density model [27], FPV models [28] and the flamelet generated manifold method [29].…”

Section: Introductionmentioning

confidence: 99%

Influence of turbulence–chemistry interaction forn-heptane spray combustion under diesel engine conditions with emphasis on soot formation and oxidation

Bolla

Farrace

Wright

et al. 2014

Combustion Theory and Modelling

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The influence of the turbulence-chemistry interaction (TCI) for n-heptane sprays under diesel engine conditions has been investigated by means of computational fluid dynamics (CFD) simulations. The conditional moment closure approach, which has been previously validated thoroughly for such flows, and the homogeneous reactor (i.e. no turbulent combustion model) approach have been compared, in view of the recent resurgence of the latter approaches for diesel engine CFD. Experimental data available from a constant-volume combustion chamber have been used for model validation purposes for a broad range of conditions including variations in ambient oxygen (8-21% by vol.), ambient temperature (900 and 1000 K) and ambient density (14.8 and 30 kg/m 3 ). The results from both numerical approaches have been compared to the experimental values of ignition delay (ID), flame lift-off length (LOL), and soot volume fraction distributions. TCI was found to have a weak influence on ignition delay for the conditions simulated, attributed to the low values of the scalar dissipation relative to the critical value above which auto-ignition does not occur. In contrast, the flame LOL was considerably affected, in particular at low oxygen concentrations. Quasi-steady soot formation was similar; however, pronounced differences in soot oxidation behaviour are reported. The differences were further emphasised for a case with short injection duration: in such conditions, TCI was found to play a major role concerning the soot oxidation behaviour because of the importance of soot-oxidiser structure in mixture fraction space. Neglecting TCI leads to a strong over-estimation of soot oxidation after the end of injection. The results suggest that for some engines, and for some phenomena, the neglect of turbulent fluctuations may lead to predictions of acceptable engineering accuracy, but that a proper turbulent combustion model is needed for more reliable results.

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“…Over the past decade, the CMC model has been successfully applied to numerous nonpremixed applications such as bluff body flames [32][33][34], jet flames [35][36][37][38], hood fires [39,40], spray ignition [41], diesel engines [42][43][44][45] and soot formation [46]. However, fewer studies have been performed in the context of premixed combustion [47][48][49].…”

Section: Introductionmentioning

confidence: 99%