Experimental and Numerical Investigation of High-Pressure Diesel Sprays with Multiple Injections at Engine Conditions

Lucchini, Tommaso; D’Errico, Gianluca; Ettorre, Daniele; Brusiani, Federico; Bianchi, Gian Marco; Montanaro, Alessandro; Allocca, Luigi

doi:10.4271/2010-01-0179

Cited by 33 publications

(20 citation statements)

References 25 publications

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“…Collision and coalescence were not taken into account since they have a minimum influence when evaporating sprays have to be simulated (Baumgarten, 2006). Further details of the implementation of the primary atomization model used in this study can be found in Lucchini et al (2010) and Gong et al (2014).…”

Section: Liquid-phase Governing Equations and Spray Sub-modelsmentioning

confidence: 99%

On large eddy simulation of diesel spray for internal combustion engines

Jangi

Solsjö

Johansson

et al. 2015

International Journal of Heat and Fluid Flow

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Section: Liquid-phase Governing Equations and Spray Sub-modelsmentioning

confidence: 99%

On large eddy simulation of diesel spray for internal combustion engines

Jangi

Solsjö

Johansson

et al. 2015

International Journal of Heat and Fluid Flow

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“…It was technically difficult to pressurize the air and apply a backpressure on the spray. Several studies [24][25][26] have shown that this parameter should not significantly alter the injection rate measurement, particularly at high rail pressures. No damages or erosions were noticed on the pressure sensor plate.…”

Section: Injection Rate Test Rigmentioning

confidence: 99%

In Situ Injection Rate Measurement to Study Single and Split Injections in a Heavy-Duty Diesel Engine

Aljohani¹,

Houidi²,

Babayev³

et al. 2019

SAE Technical Paper Series

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The split injection strategy holds a potential for high pressure combustion engines. One advantage of such strategy is the capability to control the heat release rate, which also implies the use of multiple split-injections with relatively short dwell intervals. Most injection rate measurement techniques require installment of the injector on a dedicated test rig. However, these techniques fail to accurately reproduce real-engine operating conditions. Using the spray impingement method, this paper investigates the injection rate of a high flow-rate solenoid injector while being operated on the engine. The aim is to have an experimental configuration as similar as possible to the real engine in terms of the acoustics and the fuel temperature within the injection system. The assumption of spray force proportional to the spray momentum is used to measure the injection rate. The spray momentum is measured while the injector is mounted on the Volvo D13 engine and connected to the in-series fuel rail and pump. A high-natural-frequency piezoelectric pressure transducer is mounted perpendicularly at 4 mm from one of the nozzle holes. The injector and sensor are contained within a specially designed collector for the injected fuel, which is maintained at atmospheric pressure and temperature. Experiments with single injection are conducted varying the Duration of Injection (DOI) from 400 up to 2000 µs. The tests with split double-injections are conducted with fixed DOI of 500 µs while the dwell time are varied from 100 up to 1000 µs. All tests are performed at the rail pressures of 500, 1000, 1500 and 2000 bar while the engine is operated at 1200 rpm. Results show that the injection rate shape of single injections is highly dependent on the rail pressure profile. With double split-injections, the rate of the second injection as well as the total fuel mass injected increases when the dwell time is shortened. Short dwell intervals boost the fuel quantities as a result of the altered needle response. Long dwell time between two equally-long injections generate similar injection rates. The injector hydraulic delay was more pronounced when dwell time was kept long enough. Overall, higher injection pressure advances the effective start of injection while retarding the effective end of injection.

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“…Hence, mesh size and structure must be carefully chosen due to the well-known grid dependency problem. Following previous works, [17,18], separate models were applied to predict atomization and secondary breakup processes. This is expected to better reproduce the morphology and the evolution of sprays emerging from large nozzles.…”

Section: Spray Modelmentioning

confidence: 99%

A comprehensive methodology for computational fluid dynamics combustion modeling of industrial diesel engines

Lucchini

Torre

Onorati

et al. 2017

International Journal of Engine Research

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• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Link to publication• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Abstract. Combustion control and optimization is of great importance to meet future emission standards in Diesel engines: increase of bmep at high loads and extension of the operating range of advanced combustion modes seem to be the most promising solutions to reduce fuel consumption and pollutant emissions at the same time. Within this context, detailed CFD tools are required to predict the different involved phenomena such as fuel-air mixing, unsteady diffusion combustion and formation of noxious species. Detailed kinetics, consistent spray models and high quality grids are necessary to perform predictive simulations which can be used either for design or diagnostic purposes. In this work, the authors present a comprehensive approach which was developed using an open-source CFD code. To minimize the pre-processing time and preserve results accuracy, algorithms for automatic mesh generation of spray-oriented grids were developed and successfully applied to different combustion chamber geometries. The Lagrangian approach was used to describe the spray evolution while the combustion process is modeled employing detailed chemistry and, eventually, considering turbulence/chemistry interaction. The proposed CFD methodology was first assessed considering inert and reacting experiments in a constant volume vessel, where operating conditions typical of heavy duty Diesel Engines were reproduced. Afterwards, engine simulations were performed considering two different load points and two piston bowl geometries, respectively. Experimental validation was carried out by comparing computed and experimental data of in-cylinder pressure, heat release rate ...

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Experimental and Numerical Investigation of High-Pressure Diesel Sprays with Multiple Injections at Engine Conditions

Cited by 33 publications

References 25 publications

On large eddy simulation of diesel spray for internal combustion engines

On large eddy simulation of diesel spray for internal combustion engines

In Situ Injection Rate Measurement to Study Single and Split Injections in a Heavy-Duty Diesel Engine

A comprehensive methodology for computational fluid dynamics combustion modeling of industrial diesel engines

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