Modeling the Diesel Fuel Spray Breakup by Using a Hybrid Model

Bianchi, Gian Marco; Pelloni, P.

doi:10.4271/1999-01-0226

Cited by 59 publications

(26 citation statements)

References 28 publications

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“…(Lee and Reitz, 2010) analyzed flow characteristics for different shapes of the nozzle flow passage in axisymmetric single hole nozzles and multi-hole nozzle configurations (mini-sac and valve-covered orifice eight-hole nozzles) with the HEM of the modified KIVA-3V and the emphasis was put on the end of injection period. On the basis of study on nozzle cavitating flow, in recent years, researchers also began trying to couple the flow parameters of cavitating and turbulent flow at the exit of the nozzle hole to the subsequent spray and perform the study on setting up the new spray models coupled with nozzle cavitating flow, such as (Huh and Gosman, 1991;Bianchi et al, 1999;2001;Arcoumanis et al, 1997). However, more research still need to be done because of the complex of the problem of spray.…”

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confidence: 98%

Diesel nozzle geometries on spray characteristics with a spray model coupled with nozzle cavitating flow

Wang

Liu

et al. 2015

Int.J Automot. Technol.

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Fuel spray characteristics is known to significantly affect the combustion and emission processes in diesel engines. High-pressure common-rail system can supply so high injection pressure for getting the better spray characteristics to enhance combustion efficiency and reduce emission. With the fuel injection pressure increasing, spray process becomes more and more complex which makes the study on atomization mechanism more challenging. Under the super high injection pressure, the internal turbulent flow and cavitating flow of the nozzle will greatly influence the subsequent fuel atomization process and spray characteristics, especially the cavitation has been the key to relating internal flow of nozzle and atomization behavior. So it is necessary to simulate the fuel spray process considering of internal cavitating flow of the nozzle. In this paper, firstly, the high-precision three-dimension structure of nozzle with detailed internal geometry information were obtained using synchrotron radiation x-ray phase contrast imaging technology, which was used for the mesh generation of three-dimensional numerical simulation of the cavitating flow in the nozzle. Then the spray model coupled with nozzle cavitating flow was setup in FIRE v2010 and validated by the spray experimental data got from the high-speed imaging technology on a high-pressure common-rail injection system. The spray simulations coupled with cavitating flow showed that the cavitating flow characteristics in nozzles have a large effect on both macroscopic properties and microscopic properties. Finally basing on the above verified spray model, multi-scheme simulations with various geometry parameters of nozzle were performed and the effect of nozzle geometries on the spray characteristics was analyzed and it was concluded that the nozzle sac volume, hole inlet curvature, hole inclination angle, injector needle lift and needle eccentricity had obvious effects on the nozzle flow and subsequent spray, and there was an opposite trend between the spray penetration and Sauter mean diameter, which provided a certain reference value for structure optimization of the fuel system.

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confidence: 98%

Diesel nozzle geometries on spray characteristics with a spray model coupled with nozzle cavitating flow

Wang

Liu

et al. 2015

Int.J Automot. Technol.

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“…Phase n is the bulk liquid phase from the nozzle, which disintegrates into the droplet phases. The applied primary break-up model is based on the work of Bianchi et al [17] considering two independent mechanisms, aerodynamic surface wave growth and internal stresses by injector flow turbulence. The secondary break-up causes mass transfer within the droplet phases 2 to n-1, and is modelled with the standard WAVE model formulated by Reitz [18].…”

Section: Physical Modelsmentioning

confidence: 99%

Coupling of 3D Eulerian and Lagrangian Spray Approaches in Industrial Combustion Engine Simulations

Edelbauer¹

2014

JEPE

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Abstract:The Lagrangian DDM (discrete droplet model) is state-of-the-art for CFD (computational fluid dynamics) simulations of mixture formation and combustion in industrial engines. A commonly known drawback of the DDM approach is the attenuated validity in the dense spray, where the bulk liquid disintegrates into droplets. There the assumption of single droplets surrounded by a homogenous gas field is not reasonable. In this region, the Eulerian-Eulerian multi-phase approach performs better because instead of parcels the spray is represented by the volume fractions of one bulk liquid and several droplet size class phases. A further drawback of the DDM approach is that increasing the spatial resolution of the computational grid leads to a reduced statistical convergence, since the number of spray parcels per computational cell becomes smaller. It is desirable to combine the benefits of both spray approaches in coupled CFD simulations. Therefore, the dense spray region is simulated separately with the Eulerian spray approach on a highly resolved mesh covering only the region close to the nozzle orifice. The entire engine domain with combustion and emission models is simulated with the Eulerian-Lagrangian spray approach for the dilute spray region. The two simulations are coupled through exchange of boundary conditions and model source terms. An on-line coupling interface manages the data transfer between the two simulation clients, i.e., Eulerian spray and engine client. The aim of this work is to extend the coupled spray approach in terms of exchanging combustion related heat and species sources, and consequently creating the link between Eulerian spray and combustion models. The results show mixture formation and combustion in real-case engine simulations, and demonstrate the feasibility of spray model combination in engineering applications.

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“…The disintegration rate of the bulk liquid phase n into the droplet phase l, ðdD n =DtÞ P;nl , is calculated according to the model of [37], taking into consideration two independent mechanismsaerodynamic surface wave growth and internal turbulence stresses caused by injector flow. The diameter change rate of the blob due to the secondary break-up ðdD k =DtÞ S;kl is modelled by the standard WAVE model [38].…”

Section: Eulerian Multiphase Approachmentioning

confidence: 99%

Numerical modelling of diesel spray using the Eulerian multiphase approach

Vujanović

Petranović

Edelbauer

et al. 2015

Energy Conversion and Management

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a b s t r a c tThis research investigates high pressure diesel fuel injection into the combustion chamber by performing computational simulations using the Euler-Eulerian multiphase approach. Six diesel-like conditions were simulated for which the liquid fuel jet was injected into a pressurised inert environment (100% N 2 ) through a 205 lm nozzle hole. The analysis was focused on the liquid jet and vapour penetration, describing spatial and temporal spray evolution. For this purpose, an Eulerian multiphase model was implemented, variations of the sub-model coefficients were performed, and their impact on the spray formation was investigated. The final set of sub-model coefficients was applied to all operating points. Several simulations of high pressure diesel injections (50, 80, and 120 MPa) combined with different chamber pressures (5.4 and 7.2 MPa) were carried out and results were compared to the experimental data. The predicted results share a similar spray cloud shape for all conditions with the different vapour and liquid penetration length. The liquid penetration is shortened with the increase in chamber pressure, whilst the vapour penetration is more pronounced by elevating the injection pressure. Finally, the results showed good agreement when compared to the measured data, and yielded the correct trends for both the liquid and vapour penetrations under different operating conditions.

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Modeling the Diesel Fuel Spray Breakup by Using a Hybrid Model

Cited by 59 publications

References 28 publications

Diesel nozzle geometries on spray characteristics with a spray model coupled with nozzle cavitating flow

Diesel nozzle geometries on spray characteristics with a spray model coupled with nozzle cavitating flow

Coupling of 3D Eulerian and Lagrangian Spray Approaches in Industrial Combustion Engine Simulations

Numerical modelling of diesel spray using the Eulerian multiphase approach

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