Hydrogen Assisted Jet Ignition (HAJI) is a novel method of maintaining combustion stability during ultra-lean operation of conventional, homogeneously charged, SI engines. When operating with HAJI above λ=2, CO and NOx emissions fall to low levels while HC emissions rise to approximately double their stoichiometric value.HC emissions were investigated by operating a HAJI equipped, optically accessible, four-valve single cylinder engine at 600 r/min, wide open throttle (WOT), and from λ=1 to λ=2.4. A fast flame ionisation detector was used to collect real time hydrocarbon concentration data from behind one of the exhaust valves, inside the HAJI pre-chamber, and from near the combustion chamber wall. Flame images were also obtained.Exhaust port sampling shows that the HC concentration during blowdown and early exhaust is increased, but the concentration at the end of exhaust is decreased. Sampling from within the HAJI prechamber indicates that the prechamber is not acting as a HC storage mechanism, or ‘large crevice’. In-cylinder sampling near the wall shows that a thicker wall quench layer forms and is maintained throughout the cycle. This wall layer is markedly reduced in the region where the HAJI jet impinges on the wall. The structure and shape of the HAJI flame images support these findings.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Hydrocarbon Emissions from a HAJI Equipped Ultra-lean Burn SI Engine


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    International Congress & Exposition ; 1998



    Erscheinungsdatum :

    1998-02-23




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Hydrocarbon Emissions from a HAJI equipped Ultra-lean Burn SI Engine

    Lawrence, J. / Watson, H. C. / Society of Automotive Engineers | British Library Conference Proceedings | 1998


    Hydrocarbon emissions from a HAJI equipped ultra-lean burn SI engine

    Lawrence, J. / Watson, H.C. | Tema Archiv | 1998


    Hydrocarbon emissions from a HAJI equipped ultra-lean burn SI engine

    Lawrence,J. / Watson,H.C. / Univ.of Melbourne,US | Kraftfahrwesen | 1998


    Hydrocarbon Emissions from a Gas Fueled SI Engine under Lean Burn Conditions

    Kim, Changup / Bae, Choongsik | SAE Technical Papers | 1999


    Hydrocarbon emissions from a gas fueled spark-ignition engine under lean burn conditions

    Kim,C. / Bae,C. / Korea Advanced Inst.of Science and Technol.,KR | Kraftfahrwesen | 1999