A New Droplet Collision Algorithm

Schmidt, David P.; Rutland, Christopher J.

doi:10.1006/jcph.2000.6568

Cited by 675 publications

(235 citation statements)

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“…The effect of the turbulent flow on spray drops is modeled using O'Rourke's turbulent dispersion model by accounting a fluctuating velocities [38]. For collision model, the traditional O'Rourke collision scheme [38] and no-time-counter (NTC) method [39] are tested, and extended with Post and Abraham's inclusion of collision regimes [40]. For spray evaporation, Frossling's [41] evaporation model is implemented in this work with all base parcel species are considered as evaporation source.…”

Section: Numerical Setupmentioning

confidence: 99%

Effects of In-Cylinder Mixing on Low Octane Gasoline Compression Ignition Combustion

Badra

Elwardany

Sim

et al. 2016

SAE Technical Paper Series

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Gasoline compression ignition (GCI) engines have been considered an attractive alternative to traditional spark ignition engines. Low octane gasoline fuel has been identified as a viable option for the GCI engine applications due to its longer ignition delay characteristics compared to diesel and in the volatility range of gasoline fuels. In this study, we have investigated the effect of different injection timings at part-load conditions using light naphtha stream in single cylinder engine experiments in the GCI combustion mode with injection pressure of 130 bar. A toluene primary reference fuel (TPRF) was used as a surrogate for the light naphtha in the engine simulations performed here. A physical surrogate based on the evaporation characteristics of the light naphtha has been developed and its properties have been implemented in the engine simulations. Full cycle GCI computational fluid dynamics (CFD) engine simulations have been successfully performed while changing the start of injection (SOI) timing from -50° to -11 ° CAD aTDC. The effect of SOI on mixing and combustion phasing was investigated using detailed equivalence ratio-temperature maps and ignition delay times. Both experimental and computational results consistently showed that an SOI of -30° CAD aTDC has the most advanced combustion phasing (CA50), with the highest NOx emission. The effects of the SOI on the fuel containment in the bowl of the piston, the ignition delay time, combustion rate and emissions have been carefully examined through the CFD calculations. It was found that the competition between the equivalence ratio and temperature is the controlling parameter in determining the combustion phasings.

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Section: Numerical Setupmentioning

confidence: 99%

Effects of In-Cylinder Mixing on Low Octane Gasoline Compression Ignition Combustion

Badra

Elwardany

Sim

et al. 2016

SAE Technical Paper Series

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“…The liquid phase was treated with a traditional Lagrangian discrete phase model along with the "blob" injection method [34]. The droplet secondary breakup and collision processes were modeled using Kelvin-Helmholtz and Rayleigh-Taylor (KH-RT) model [35][36] and "no time counter" algorithm [37], respectively.…”

Section: Computational Fluid Dynamic Modeling Approachmentioning

confidence: 99%

Experimental and numerical study of lift-off length and ignition delay of a two-component diesel surrogate

Payri

Viera

Pei

et al. 2015

Fuel

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Elsevier Payri, R.; Viera Sotillo, JP.; Pei, Y.; Som, S. (2015). Experimental and numerical study of liftoff length and ignition delay of a two-component diesel surrogate. AbstractUnderstanding and controlling mixing and combustion processes is fundamental for the ever more demanding pollutant regulations and fuel consumption standards of direct injection diesel engines. The fundamentals of these processes haven been long studied from both experimental and numerical perspectives. As numerical models become more advanced, the need for adequate experimental data increases. Hence, experimental methodologies and scientific databases need to be enhanced with more quantitative, accurate, consistent, and reliable information in order to evaluate the models in a robust fashion. The present study seeks to enhance the current state-of-the-art by further evaluating the combustion performance of a two-

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“…The atomization of the liquid blobs/ parcels and subsequent droplets was simulated with models based on the Kelvin-Helmholtz (KH) and Rayleigh-Taylor (RT) instability mechanisms without the use of a breakup length [21]. The No Time Counter (NTC) collision method of Schmidt and Rutland [22] was used for the reported simulations. The NTC model allows for a better statistical representation of a spray since more parcels can be used for a given quantity of injected fuel [24].…”

Section: Liquid Spray Modelingmentioning

confidence: 99%