Validation of Eulerian Spray Concept coupled with CFD Combustion Analysis

Suzzi, Daniele; Krüger, Christian; Blessing, M.; Wenzel, Paul

doi:10.4271/2007-24-0044

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…The exchange of the combustion sources is very important, since without this exchange the Eulerian spray client would not recognize the rise of gas temperature caused by combustion. This exchange determines a significant improvement compared to the status of coupled spray-engine simulations presented by Suzzi et al [27], where the back-coupling of the combustion sources was neglected.…”

Section: Coupling Of Spray Approachesmentioning

confidence: 91%

“…Furthermore, the transfer of the combustion related heat and species sources from the engine to the Eulerian spray client determines a significant improvement compared to the status of the coupled simulations achieved in Refs. [13,27]. The next steps will include detailed comparisons with standalone DDM simulations, mesh variations to determine the optimum length of the Eulerian spray cone, development of an interface taking into account spray parcels re-entering the Eulerian spray region, and coupling with injector flow.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Coupling Of Spray Approachesmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 99%

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

Edelbauer¹

2014

JEPE

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Local analysis of the tablet coating process: Impact of operation conditions on film quality

Suzzi

Radl

Khinast

2010

Chemical Engineering Science

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A Numerical Investigation of Transient Flow and Cavitation Within Minisac and Valve-Covered Orifice Diesel Injector Nozzles

Lee

Reitz

2010

Journal of Engineering for Gas Turbines and Power

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Cavitating flow within diesel injector passages has been investigated numerically using the homogeneous equilibrium model (HEM), which uses the barotropic assumption and the variable speed of sound of the mixture. To apply the HEM, the KIVA-3V code was modified to implement a generalized equation of state, and injector needle movement is simulated by the arbitrary Lagrangian-Eulerian (ALE) approach and the snapper algorithm. It is demonstrated that the model can predict the effect of nozzle passage geometry on the flow structure and cavitation. The model is able to reproduce the transient fuel injection rate as a function of the needle lift profile. Special interest is focused on the transient behavior during the nozzle closing period, which shows that the fast decrease in flow rate can increase the cavitation in the nozzle passage. The effects of the pressure difference and environment pressure on cavitation augmentation at the end-of-injection were also investigated. Flow characteristics due to different shapes of the nozzle flow passage in axisymmetric single hole nozzles and multihole nozzle configurations (minisac and valve-covered orifice eight-hole nozzles) were compared with emphasis on the end-of-injection period.

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Validation of Eulerian Spray Concept coupled with CFD Combustion Analysis

Cited by 4 publications

References 13 publications

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

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

Local analysis of the tablet coating process: Impact of operation conditions on film quality

A Numerical Investigation of Transient Flow and Cavitation Within Minisac and Valve-Covered Orifice Diesel Injector Nozzles

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