LES Study of a Turbulent Spray Jet: Mesh Sensitivity, Mesh-Parcels Interaction and Injection Methodology

D'Ausilio, Alessandro; Stanković, Ivana; Merci, Bart

doi:10.1007/s10494-019-00039-7

Cited by 12 publications

(2 citation statements)

References 23 publications

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“…The topic enjoys renewed interest, prompted by the recent experimental investigation of Verdier et al [4] using Global Rainbow Thermometry to characterize the mean droplet temperatures in a complex lab-scale n-heptane spray flame. This flame was numerically investigated in the Workshop on Measurement and Computation of Turbulent Spray Combustion by different groups [5,6,7,8,9,10] using Lagrangian droplet models for the evaporating spray cloud. Specifically, Noh et al [6] compared various evaporation models following Miller et al [3], using large-eddy simulation (LES) to asses the droplet temperature predictions.…”

Section: Introductionmentioning

confidence: 99%

Evaporation of volatile droplets subjected to flame-like conditions

Both,

Mira,

Lehmkuhl

2022

Preprint

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This work assesses Lagrangian droplet evaporation models frequently used in spray combustion simulations, with the purpose of identifying the influence of modeling decisions on the single droplet behavior. Besides more simplistic models, the evaluated strategies include a simple method to incorporate Stefan flow effects in the heat transfer (Bird's correction), a method to consider the interaction of Stefan flow with the heat and mass transfer films (Abramzon-Sirignano model), and a method to incorporate non-equilibrium thermodynamics (Langmuir-Knudsen model). The importance of each phenomena is quantified analytically and numerically under various conditions. Evaporation models ignoring Stefan flow are found to be invalid under the studied conditions. The Langmuir-Knudsen model is also deemed inadequate for high temperature evaporation, while Bird's correction and the Abramzon-Sirignano model are identified as the most relevant for numerical studies of spray combustion systems. Latter is the most elaborate model studied here, as it considers Reynolds number effects beyond the empirical correlation of Ranz and Marshall derived for low-transfer rates. Thus, the Abramzon-Sirignano model is identified as the state of the art alternative in the scope of this study.

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Section: Introductionmentioning

confidence: 99%

Evaporation of volatile droplets subjected to flame-like conditions

Both,

Mira,

Lehmkuhl

2022

Preprint

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“…G. Daviller et al [2] demonstrated a new sensor and approach to effectively produce the desired local mesh refinement to match the target losses, which are measured experimentally. Utyuzhnikov et al [3] numerically simulated the combustion of fuel droplet vapor releases in the atmosphere and there are a number of studies that have been performed, especially on the use of LES methodology [4][5][6]. Jenft et al [7] experimented with a pool fire using water mist in comparison to a nozzle spray and droplet per second.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Assimilation of Fire Suppression Modeling and Simulation of Radiant Fire by Water and Its Synergistic Effects with Carbon Dioxide

et al. 2020

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Recently, water has been employed as a supportive agent for the preparation of multiple suppressing agents including aqueous film forming foams (AFFF), which is combined with different kinds of gases for its various applications. In this study, the water mist is chosen for the gas-suppressing agent such as carbon dioxide. Our work investigated the suppression effects of water droplets on the n-heptane pool fire, and its mixture with carbon dioxide, respectively. The size and frequency of droplets with their effect on temperature and suppression was compared to observe the difference in the suppression. Initially, it was found that the droplets having a larger droplet size were found to be more efficient as compared to the smaller droplets with respect to the heat release rate, temperature, and radiation. Afterwards, a mixture of water droplets and carbon dioxide was simultaneously discharged to compare the difference between these two suppressing agents. It was found that the synergistic effect of the mixture has higher advantages over the use of only water suppression. It helps reduce the hot gases that surround the pool fire and allows the water mist to travel efficiently towards the fuel. Both suppression mechanisms were set to similar initial parameters that lead to different outcomes.

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Large-Eddy Simulation Study of Ultra-High Fuel Injection Pressure on Gasoline Sprays

Wadekar

Yamaguchi

Oevermann

2020

Flow Turbulence Combust

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The development of gasoline spray at ultra-high injection pressures was analyzed using Large-Eddy simulation (LES). Two different nozzle hole geometries, divergent and convergent shape, were considered to inject the fuel at injection pressures ranging from 200 to 1500 bar inside a constant volume spray chamber maintained at atmospheric conditions. The discrete droplet phase was treated using a Lagrangian formulation together with the standard spray sub-models. The numerical results were calibrated by reproducing experimentally observed liquid penetration length and efforts were made to understand the influence of ultra-high injection pressures on the spray development. The calibrated model was then used to investigate the impact of ultra-high injection pressures on mean droplet size and droplet size distribution. In addition, the spray-induced large-scale eddies and entrainment rate were evaluated at different ultra-high injection pressures. Overall, simulation results showed a good agreement with available measurement data. At ultra-high injection pressures mean droplet sizes were significantly reduced and comprised very high velocities. Integral length scales of spray-induced turbulence and air entrainment rate into the spray were larger at higher injection pressure compared to lower ones. Graphic abstract

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LES Study of a Turbulent Spray Jet: Mesh Sensitivity, Mesh-Parcels Interaction and Injection Methodology

Cited by 12 publications

References 23 publications

Evaporation of volatile droplets subjected to flame-like conditions

Evaporation of volatile droplets subjected to flame-like conditions

Comprehensive Assimilation of Fire Suppression Modeling and Simulation of Radiant Fire by Water and Its Synergistic Effects with Carbon Dioxide

Large-Eddy Simulation Study of Ultra-High Fuel Injection Pressure on Gasoline Sprays

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