Numerical simulation of cavitating injector flow and liquid spray break-up by combination of Eulerian–Eulerian and Volume-of-Fluid methods

Edelbauer, Wilfried

doi:10.1016/j.compfluid.2016.11.019

Cited by 34 publications

(31 citation statements)

References 27 publications

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“…While in Ref. [10] the model was validated on the well-documented water nozzle experiments from Sou et al [11], and Bicer and Sou [12], the current work shows the simulation of the simplified low-pressure gasoline injector reported by Ishimoto et al [4]. The presented simulation is performed on a finer computational grid, since the highest mesh resolution is D / 72 compared to D / 56 in Ref.…”

Section: Introductionmentioning

confidence: 79%

“…The aim of this study was to perform a further application test of the recently developed method for three-phase simulations of cavitating injector flow and liquid spray break-up by combination of Volume-of-fluid (VOF) and Eulerian-Eulerian (EE) methods [10]. Furthermore, a method for quantification of non-spherical ligaments was proposed.…”

Section: Discussionmentioning

confidence: 99%

“…In Ref. [10] it was shown that the volume fraction and momentum equations for EE and VOF are similar, although the volume fraction and the interphase exchange terms haves different meanings. While for the EE transport equation the volume fraction indicates the ensemble-averaged phase indicator function and is proportional to the amount of the dispersed phase, the VOF volume fraction indicates the location of the fluid-fluid interface, as described by the following equation for phase k :…”

Section: Combination Of Eulerian-eulerian and Volume-of-fluid Methodsmentioning

confidence: 99%

“…A drag model describes the momentum interaction between liquid and vapor within the EE framework, while the surface tension force acts at the VOF-interface between liquid and gas when the equation for the mixture velocity U m is solved. Further details can be found in our previous publication [10].…”

Section: Combination Of Eulerian-eulerian and Volume-of-fluid Methodsmentioning

confidence: 99%

“…The current paper presents a new application of our recently proposed method [10] for combination of the Eulerian-Eulerian (EE) and the VOF methods in spray simulations with cavitating injector flow. The model deals with three phases, and the liquid-vapor interaction in terms of mass transfer and momentum drag is modelled within the EE framework.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of spray break-up from cavitating nozzle flow by combined Eulerian–Eulerian and volume-of-fluid methods

Edelbauer¹,

Kolar²,

Schellander³

et al. 2017

Int. J. CMEM

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The present study shows new results from the recently proposed method for numerical simulations of the spray break-up of cavitating liquid jets. A three-component system consisting of liquid, vapor and gas is applied for the volume-of-fluid simulation of the liquid disintegration in order to track the liquid-gas interface. To keep the numerical effort moderate, the liquid-vapor interface is not resolved by the computational grid, there mass and momentum transfer are described within the Eulerian-Eulerian framework. The numerical method is applied on a simplified injector-like geometry from the literature operated with gasoline at low pressure difference. For quantification of the detached spray ligaments, a new evaluation algorithm has been developed and implemented into the applied CFD code. It scans the liquid volume fraction field for separated ligaments, and determines their position, size and velocity. Additionally the ligament extensions along the principal axes of inertia are determined in order to evaluate the non-sphericity of each ligament after break-up. The presented simulation technique allows detailed numerical investigations of the spray formation process on the micro-scale by taking into account nozzle cavitation, turbulence and aerodynamic forces.

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Section: Introductionmentioning

confidence: 79%

Section: Discussionmentioning

confidence: 99%

Section: Combination Of Eulerian-eulerian and Volume-of-fluid Methodsmentioning

confidence: 99%

Section: Combination Of Eulerian-eulerian and Volume-of-fluid Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of spray break-up from cavitating nozzle flow by combined Eulerian–Eulerian and volume-of-fluid methods

Edelbauer¹,

Kolar²,

Schellander³

et al. 2017

Int. J. CMEM

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Direct Numerical Simulation of Atomization Characteristics of ECN Spray-G Injector: In-Nozzle Fluid Flow and Breakup Processes

Li,

Ries,

Sun

et al. 2023

Flow Turbulence Combust

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In order to sustain applications dealing with various liquid fuels in internal combustion engine (ICE), it is essential to make available prediction methodologies that allow an early evaluation of the potential usefulness of such fuels in terms of favourable mixture preparation process already in realistic configurations. Since the air-mixture formation and subsequent processes are predominantly governed by the fuel injection, a DNS based numerical investigation coupled with VOF as an interface tracking method is carried out in this paper to gain better insight on the fuel injection from an industrial injector "Spray G" configuration. Chosen from Engine Combustion Network (ECN), this is a gasoline direct injector (GDI) featuring 8-holes orifices and operating with high injection pressure (200 bar). Under consideration of the required computational cost associated with DNS, only the 1/8 of the nozzle geometry including one orifice is used. The numerical simulation is accomplished for the quasi-steady injection condition with nozzle needle fully opened. The obtained results are first validated with available experimental data for nozzle mass flow rate and spray spread angle showing a good agreement. Then, a detailed numerical analysis is provided for the in/near nozzle flow evolution especially for flow turbulence, primary and secondary atomization. Furthermore, droplet statistics in terms of droplet shape, and droplet size-velocity distribution together with a breakup regime map are reported. Finally, a 2-D data curation technique is proposed to extract the droplet statistics along selected planes and evaluated by direct comparison with three-dimensional droplet data, which may allow handling of the DNS data in more feasible and economical way especially for time series data with higher frequency. The comprehensive DNS data generated by this DNS-VOF approach enable not only to carry out detailed numerical analysis of in- and near-nozzle physical phenomena for which experimental data are still scarce, but also to provide a hint of more reliable injector boundary conditions useful for lower order spray injection method based on Lagrangian particle tracking.

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Comparison of Different Techniques for Characterizing the Diesel Injector Internal Dimensions

et al. 2018

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The geometry of certain parts of diesel injectors is key to the injection, atomization and fuel-air mixing phenomena. Small variations on the geometrical parameters may have a strong influence on the aforementioned processes. Thus, OEMs need to assess their manufacturing tolerances, whereas researchers in the field (both experimentalists and modelers) rely on the accuracy of a certain metrology technique for their studies. In the current paper, an investigation of the capability of different experimental techniques to determine the geometry of a modern diesel fuel injector has been performed. For this purpose, three main elements of the injector have been evaluated: the control volume inlet and outlet orifices, together with the nozzle orifices. While the direct observation of the samples through an

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Numerical simulation of cavitating injector flow and liquid spray break-up by combination of Eulerian–Eulerian and Volume-of-Fluid methods

Cited by 34 publications

References 27 publications

Numerical simulation of spray break-up from cavitating nozzle flow by combined Eulerian–Eulerian and volume-of-fluid methods

Numerical simulation of spray break-up from cavitating nozzle flow by combined Eulerian–Eulerian and volume-of-fluid methods

Direct Numerical Simulation of Atomization Characteristics of ECN Spray-G Injector: In-Nozzle Fluid Flow and Breakup Processes

Comparison of Different Techniques for Characterizing the Diesel Injector Internal Dimensions

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