Large Eddy Simulation of High Gas Density Effects in Fuel Sprays

Kaario, Ossi; Vuorinen, Ville; Hulkkonen, Tuomo; Keskinen, Kari I.; Nuutinen, Mika; Larmi, Martti; Tanner, Franz X.

doi:10.1615/atomizspr.2013006784

Cited by 23 publications

(28 citation statements)

References 39 publications

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“…The gas mass flow rate ̇ as well as the average gas temperature in the pipe were measured in [5]. [28,30,31] where it has been shown that cell size somewhat below the nozzle hole size is sufficiently small. In [30], it was observed that 5% of the total turbulent kinetic energy was modeled implying that 95% was resolved.…”

Section: Computational Setup and Scr Geometrymentioning

confidence: 99%

“…[28,30,31] where it has been shown that cell size somewhat below the nozzle hole size is sufficiently small. In [30], it was observed that 5% of the total turbulent kinetic energy was modeled implying that 95% was resolved. According to literature [32,33], at least 80% of the turbulent kinetic energy should be resolved for good quality LES.…”

Section: Computational Setup and Scr Geometrymentioning

confidence: 99%

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Mixing and evaporation analysis of a high-pressure SCR system using a hybrid LES-RANS approach

Kaario

Vuorinen

Zhu

et al. 2017

Energy

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A hybrid Large Eddy Simulation (LES)-Reynolds-Averaged Navier-Stokes (RANS) method (HLR) has been applied to simulate an engine related selective catalytic reduction (SCR) system. Typical SCR systems utilize low pressure urea injection together with a mixer for vapor field homogenization. Simultaneously, it is also desirable to reduce spray-wall interaction to avoid urea crystallization. The present study considers an SCR system where a high pressure (150 bar) urea spray is injected towards hot exhaust gases in exhaust pipe. The system has been shown to work well in a previous experimental study but detailed characterization of the system is missing. The novelty of the present study rises from: 1) the creation of phase diagrams with single droplet simulations that predict the optimum operation regions for the SCR system, 2) validation of the HLR method in a high Reynolds number (= 49,900) compressible pipe flow, 3) the use of HLR simulations in an engine SCR system for the first time, and 4) the detailed characterization of the present SCR system. As a result of the study, new non-dimensional timescale ratios are proposed to link the droplet size and liquid injection velocity to the exhaust pipe dimensions in future SCR systems.

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Section: Computational Setup and Scr Geometrymentioning

confidence: 99%

Section: Computational Setup and Scr Geometrymentioning

confidence: 99%

Mixing and evaporation analysis of a high-pressure SCR system using a hybrid LES-RANS approach

Kaario

Vuorinen

Zhu

et al. 2017

Energy

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“…LES needs principally finer meshes compared to the ones used for Reynolds Averaged Navier-Stokes (RANS) computations. Since RANS models cannot capture features of the transient spray structure [9,12,42,43] such as droplet clustering and shot to shot variability, LES is applied to overcome these limitations. In addition, the conventional atomization models with Lagrangian Particle Tracking (LPT) limit the grid fineness near the nozzle and do not allow LES to capture the features of the spray and background fluid flow near the nozzle.…”

mentioning

confidence: 99%

Analysis of diesel spray dynamics using a compressible Eulerian/VOF/LES model and microscopic shadowgraphy

Ghiji

Goldsworthy

Brandner

et al. 2017

Fuel

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“…For verification the numerical methodology for modeling the primary break-up, the following problem was considered [4]. The geometry and dimensions of the nozzle are shown in In the calculations, four spray variants were considered corresponding to the parameters presented in Table 1.…”

Section: Problem Statement and Research Methodsmentioning

confidence: 99%

“…A review of existing methods for simulating the spraying of liquids has shown that in these models the droplets generation is simplified resulting in inaccurate and unrealistic simulations. [3,4]. For example, the blob atomization method which is the most employed model not only simply generates parcels with the size of the nozzle diameter but also does not take into account the physics of in-nozzle turbulence [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Computational Modeling of the Atomizing of a Gas Stream from a Pneumatic Nozzle

Кузнецов

Минаков

Shebelev

2019

2019 International Science and Technology Conference "EastConf"

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Atomizing of liquid is widely used in modern technology. Atomizing occupies an extremely important place in power engineering, when burning liquid fuels. In this work provides verification of the method for modeling the atomizing of a gasliquid stream from a pneumatic nozzle. Primary atomization is modelled using Large Eddy Simulation model (LES) and The Volume Of Fluid model (VOF). The results of the calculations show an acceptable agreement with experiment on the main characteristics of the spray. The results of calculations can be very useful for estimations, since they allow qualitatively correct determination of the structure of a two-phase flow, parameters and shape of droplets, and the speed and direction of their motion, which in principle can not be obtained by other methods.

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Large Eddy Simulation of High Gas Density Effects in Fuel Sprays

Cited by 23 publications

References 39 publications

Mixing and evaporation analysis of a high-pressure SCR system using a hybrid LES-RANS approach

Mixing and evaporation analysis of a high-pressure SCR system using a hybrid LES-RANS approach

Analysis of diesel spray dynamics using a compressible Eulerian/VOF/LES model and microscopic shadowgraphy

Computational Modeling of the Atomizing of a Gas Stream from a Pneumatic Nozzle

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