Combined application of 1D-3D simulations and auto-regressive technique for the characterization of knock proximity in a small VVA turbocharged engine (Contributo in atti di convegno)

Type
Label
  • Combined application of 1D-3D simulations and auto-regressive technique for the characterization of knock proximity in a small VVA turbocharged engine (Contributo in atti di convegno) (literal)
Anno
  • 2014-01-01T00:00:00+01:00 (literal)
Alternative label
  • E.Severi, S.Fontanesi, V.De Bellis, F.Bozza, D.Siano (2014)
    Combined application of 1D-3D simulations and auto-regressive technique for the characterization of knock proximity in a small VVA turbocharged engine
    in International Multidimensional Engine Modeling (IMEM) User's Group Meeting at the SAE Congress, Detroit (USA), 7 aprile 2014
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • E.Severi, S.Fontanesi, V.De Bellis, F.Bozza, D.Siano (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • E.Severi -Università di Modena e Reggio Emilia S.Fontanesi -Università di Modena e Reggio Emilia V.De Bellis -Università di Napoli \"Federico II\" F.Bozza -Università di Napoli \"Federico II\" (literal)
Titolo
  • Combined application of 1D-3D simulations and auto-regressive technique for the characterization of knock proximity in a small VVA turbocharged engine (literal)
Abstract
  • An Auto-Regressive (AR) technique and an integrated numerical approach based on the synergic use of 1D and 3D CFD tools are used to investigate the knock behavior of a last generation small size spark ignition (SI) turbocharged VVA engine. The AR model is used to process over two-hundred experimental in-cylinder pressure traces in order to estimate the statistical distribution of knocking cycles, to try to define a noise variance-based knock index and to return information on the knock safety margin for the considered spark timing. Furthermore, the AR model is used to support the results obtained by applying the integrated 1D- and 3D-CFD approach. This last relies on a well-established methodology: the 1D model is at first used to provide time-varying boundary conditions for the 3D counterpart under motored conditions and for various rpms. A full 3D multi-cycle analysis is then performed, to estimate in-cylinder mean and turbulent flow characteristics, which in turn are then used to tune an \"in-house developed\" turbulence sub-model included in the 1D software. 1D results are then validated against the experimental data under fired full load operations, by employing a further \"in-house developed\" combustion sub-model. Resulting boundary conditions are finally passed back to the 3D code in order to investigate in details two full load operations exhibiting relevant differences in terms of knock proximity. Test bench data are used to validate the 3D CFD combustion analyses for the experimentally actuated spark advance. A detailed knock analysis is then performed for earlier spark timing (literal)
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