Experimental and numerical analysis of high pressure diesel spray-wall interaction (Articolo in rivista)

Type
Label
  • Experimental and numerical analysis of high pressure diesel spray-wall interaction (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1016/j.ijmultiphaseflow.2007.01.003 (literal)
Alternative label
  • Andreassi L. 1, Ubertini S. 1, Allocca L. 2 (2007)
    Experimental and numerical analysis of high pressure diesel spray-wall interaction
    in International journal of multiphase flow
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Andreassi L. 1, Ubertini S. 1, Allocca L. 2 (literal)
Pagina inizio
  • 742 (literal)
Pagina fine
  • 765 (literal)
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  • http://www.scopus.com/record/display.url?eid=2-s2.0-34249897479&origin=resultslist&sort=plf-f&src=s&nlo=&nlr=&nls=&imp=t&sid=E6032F919611E41E1A2C9D2807395126.euC1gMODexYlPkQec4u1Q%3a370 (literal)
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  • 33 (literal)
Rivista
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  • 24 (literal)
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  • 7 (literal)
Note
  • Scopu (literal)
  • ISI Web of Science (WOS) (literal)
  • Google Scholar (literal)
  • SCImago (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1) Dip. Ingegneria meccanica, Univ. \"Tor Vergata\", Roma; 2) Istituto Motori, CNR, Napoli. (literal)
Titolo
  • Experimental and numerical analysis of high pressure diesel spray-wall interaction (literal)
Abstract
  • The interaction between impacting and splashed droplets and air motion plays a fundamental role on the mixture formation process, which is a crucial aspect for the correct operation of modern DI Diesel engines as it greatly influences the combustion process and the exhaust emissions. A complete understanding of spray impingement is quite complex. A mixed numerical-experimental approach is proposed in this paper. The experimental tests are carried out with a high pressure (up to 120 MPa) diesel spray emerging from an axial disposed single-hole nozzle in an optically accessible vessel, pressurized up to 5.0 MPa at ambient temperature. The jet impacts on a .at stainless steel wall heated up to 500°C by a 200 W temperature regulated electrical resistance wire. The experimental analysis is performed using a Bosh tube as the injection mass flow meter, a pulsed laser sheet generated on the second harmonic of a Nd-YAG laser and a synchronized CCD camera. Digital image post-processing allows extraction of the radial penetration and thickness growth of the impacted fuel versus injection pressure, vessel back-pressure and wall temperature. Moreover, a procedure to relate light intensity to average fuel density is proposed. The numerical analysis is carried out by means of a multi-dimensional numerical tool, based on the KIVA-3V code. The spray-wall interaction is simulated through a phenomenological splash model available in literature and validated for low injection pressures (up to 300 bar) and ambient back-pressure. The comparison between experimental and numerical results demonstrates the inability of the model in predicting high pressure spray-wall interaction, especially under increasing back-pressures. Based on the experimental evidences, a modified version of the model is proposed and the new model is proven to be an adequate representation for different injection pressures and back-pressures. (literal)
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