Numerical modelling and optimization of the mixture formation process by multi-hole injectors in a GDI engine (Contributo in volume (capitolo o saggio))

Type
Label
  • Numerical modelling and optimization of the mixture formation process by multi-hole injectors in a GDI engine (Contributo in volume (capitolo o saggio)) (literal)
Anno
  • 2011-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.5772/921 (literal)
Alternative label
  • Costa M., Allocca L. (2011)
    Numerical modelling and optimization of the mixture formation process by multi-hole injectors in a GDI engine
    InTech, Rijeka (Croazia) in , 2011
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Costa M., Allocca L. (literal)
Pagina inizio
  • 177 (literal)
Pagina fine
  • 208 (literal)
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  • Rijeka (Croatia) (literal)
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  • http://www.intechopen.com/books/computational-simulations-and-applications (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • Chapter 9, pp. 177-208 (ISBN 978-953-307-430-6). (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#descrizioneSinteticaDelProdotto
  • Present work is focused on two activities performed by authors within the CFD approach to the study of in-cylinder processes in SI engines: the development of a three-dimensional (3D) numerical model for the GDI spray dynamics, whose prediction capability is improved through a Simplex optimization algorithm, and the assessment of a procedure for the fuel consumption reduction based on the optimal synchronization of injection within the engine working cycle. The work is organised as following. A certain insight into the behaviour of new generation GDI multi-hole injectors is first given, by experimentally characterizing three different devices both at the mass flow rate test bench and in an optically accessible vessel. Single and double injection strategies are considered. The experimental activity is finalised to the creation of a database to be used for the assessment of a 3D numerical model for the GDI spray dynamics. The model is developed within the AVL FireTM code and exploits a log-normal distribution for the initial droplets diameter, whose expected value and variance are properly defined. Hints for a GDI engine design are then given. One of the three injector is considered as mounted on a single-cylinder engine, four-valve, four-stroke, 638 cc displacement, suitable for motorbike applications. A 3D model able to reproduce the in-cylinder energy conversion process, namely the whole pressure cycle, is build within the same commercial software environment. Two typical engine operating conditions are taken under examination, a high load and a moderate-load. In this last case, a globally lean stratified operation is studied. The influence of important parameters, as the injector orientation, the start of injection (SOI), the time of spark ignition (SI) and the injection pressure on the mixture formation and combustion processes are discussed. Results of a study of split injection under lean-mixture, moderate-speed, moderate-load working conditions are finally presented. Major aim is the application of an optimization technique for the individuation of the mixture formation process realising a combustion the most effective for the maximization of the engine work. The software modeFRONTIERTM is chosen to automatically run the 3D numerical engine model. The Simplex algorithm is adopted to draw the choice of the input parameters in the design of experiments (DOE) space. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Istituto Motori, CNR, Napoli. (literal)
Titolo
  • Numerical modelling and optimization of the mixture formation process by multi-hole injectors in a GDI engine (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#inCollana
  • Computational Simulations and Applications (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
  • 978-953-307-430-6 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#curatoriVolume
  • Zhu J. (literal)
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