Modeling evaporation effects in conditional moment closure for spray autoignition

Borghesi, Giulio; Mastorakos, Epaminondas; Devaud, Cécile; Bilger, R.W.

doi:10.1080/13647830.2011.560282

Cited by 78 publications

(44 citation statements)

References 43 publications

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“…[11], studying the auto-ignition of heptane spray in a bomb, it was observed that the auto-ignition times were over-predicted for high temperature cases. Borghesi et al [6] found that inclusion of the spray terms affected the solution in the region where the evaporation was the strongest and that these terms delayed the auto-ignition slightly, which suggests that the spray terms in the CMC equation could probably improve the results obtained in Ref. [11].…”

Section: Cmc For Two-phase Flowsmentioning

confidence: 97%

“…This term is analogous to the conditional fluctuations in the RANS-CMC approach defined as u j Y α |η [6,29]. In [6] this term was neglected, hence, in the LES where the subgrid fluctuations are expected to be small, we proceed in the same way, i.e.…”

Section: Cmc For Two-phase Flowsmentioning

confidence: 99%

“…Modelling of |η in the context of RANS approach was proposed in Ref. [6] and it was further extended to LES for modelling spark ignition of liquid-fuelled burners [15]. A very similar approach was later used in [38] for modelling of LES-CMC of an acetone flame.…”

Section: Cmc For Two-phase Flowsmentioning

confidence: 99%

“…A very similar approach was later used in [38] for modelling of LES-CMC of an acetone flame. The difference between the model proposed in [15] and the formulas used in [38] and [6] is the method of conditioning of |η. In Ref.…”

Section: Cmc For Two-phase Flowsmentioning

confidence: 99%

“…[2] using the Reynolds Averaged Navier-Stokes (RANS) approach combined with the Conditional Moment Closure (CMC) combustion model [3]. Simulations of auto-ignition of heptane sprays in a high-pressure, high-temperature closed combustion vessel has been studied applying the RANS-CMC method [4][5][6]. The application of Large Eddy Simulation (LES) for modelling of ignition together with the flame propagation in two-phase flow (kerosene-air) in an industrial combustion chamber was studied in Ref.…”

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confidence: 99%

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LES/CMC of Blow-off in a Liquid Fueled Swirl Burner

Tyliszczak

Cavaliere

Mastorakos

2013

Flow Turbulence Combust

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Large Eddy Simulations of two-phase flames with the Conditional Moment Closure combustion model have been performed for flow conditions corresponding to stable and blow-off regimes in a swirl n-heptane spray burner. In the case of stable flame (i.e. low air velocity), the predicted mean and r.m.s. velocities and the location and shape of the flame agree reasonably well with experiment. In particular, the presence of localised extinctions is captured in agreement with experiment. Using model constants previously calibrated against piloted jet methane flames (Sandia F) with localised extinction, we obtain that at the experimentally determined blow-off velocity of the swirling spray flame, the predicted flame also blows off, demonstrating that the LES-CMC approach can capture the global extinction point in a realistic configuration.

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Section: Cmc For Two-phase Flowsmentioning

confidence: 97%

Section: Cmc For Two-phase Flowsmentioning

confidence: 99%

Section: Cmc For Two-phase Flowsmentioning

confidence: 99%

Section: Cmc For Two-phase Flowsmentioning

confidence: 99%

mentioning

confidence: 99%

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LES/CMC of Blow-off in a Liquid Fueled Swirl Burner

Tyliszczak

Cavaliere

Mastorakos

2013

Flow Turbulence Combust

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CFDModeling of Diesel Combustion

Vogiatzaki

2017

Encyclopedia of Maritime and Offshore Engineering

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Diesel engines are the most efficient combustion engines today, playing an important role in transport of goods and passengers on land and on sea. The main drivers for the design of future engines is the control of the emissions without sacrificing their advanced fuel economy. These drivers led to important innovations in multiple components of the engine, which, however, complicated the nature of the processes taking place and increased the need for highly accurate simulation frameworks. In the current article, the focus is on the recent progress of combustion modeling of diesel engines. The major general challenges encountered are first introduced briefly and then the progress in various research areas is reported in more details. Special focus is given to the most commonly used combustion models describing their advantages as well as their shortcomings. In the end, some closing remarks are presented as guidelines for future modeling efforts.

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