In an optical accessible 4-stroke engine laser-induced fluorescence (LIF) imaging measurements of fuel tracer (3-pentanone) and formaldehyde were performed during the compression stroke and combustion. Formaldehyde (HCHO) is intermediately present at high concentrations within the cool flame and is burned later on when the “hot” combustion proceeds. It can be used as an internally generated tracer to observe the boundaries of the hot combustion zones. Despite the fact that a frequency-tripled Nd:YAG laser excites only weak transitions in the HCHO molecule, the high concentration (several thousands ppm) provide for sufficient signal intensity when detecting fluorescence above 395 nm. Using formaldehyde LIF, auto-ignition (occurring close to 356°ca) and the further development of combustion was observed. Combustion was completed within the field of view by 360°ca in most observed engine cycles. 3-pentanone which has been used frequently for fuel-concentration imaging in spark ignited engines was of limited use in the CAI engine due to laser and signal attenuation prior to top dead center as a result of tracer destruction during and UV absorption by cool-flame intermediates.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    In-Cylinder Combustion Visualization in an Auto-Igniting Gasoline Engine using Fuel Tracer- and Formaldehyde-LIF Imaging


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Spring Fuels & Lubricants Meeting ; 2001



    Publication date :

    2001-05-07




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Engine and Fuel Related Issues of Gasoline CAI (Controlled Auto-Ignition) Combustion

    Jeuland, Nicolas / Duret, Pierre / Montagne, Xavier | SAE Technical Papers | 2003


    Engine and Fuel Related Issues of Gasoline CAI (Controlled Auto-Ignition) Combustion

    Jeuland, N. / Montagne, X. / Duret, P. et al. | British Library Conference Proceedings | 2003




    Experimental Results of a 4-Stroke Multi-Cylinder Gasoline Engine with Controlled Auto-Ignition (CAI) Combustion

    Martins, M.E.S. / Zhao, H. / Society of Automotive Engineers | British Library Conference Proceedings | 2007