A novel diagnostic technique named a “Tracer-Producing LIF technique” which enables 2-dimensional measurement of an internal EGR within an engine cylinder, has been developed. The main feature of this technique is the utilization of a fuel additive that does not itself emit an LIF signal by irradiation of UV-light but whose combustion products radiate strong LIF emissions by UV-light irradiation. Internal EGR behaviors can be measured by observing LIF images that are excited by a UV-laser sheet. Firstly, principles of this technique were confirmed and fuel additives were selected. Then, the “Tracer-Producing LIF technique” was applied to an optically accessible single-cylinder gasoline engine in which the entire pent-roof area can be observed from the side of the engine. The internal EGR behaviors were measured through the entire engine cycle, from intake to exhaust. As a result, gas exchange process between burned gas and fresh air, as well as the influence of the valve timing on the above process, were clarified. It was also confirmed that non-homogeneous internal EGR distribution was still present at the ignition timing. Furthermore, by compensating for the influence of pressure and temperature dependency on LIF intensity, a relative internal EGR concentration measurement has been developed. So evaluation of non-uniformity of the internal EGR in different crank angles has become possible.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    2-D Internal EGR Distribution Measurements in an Engine by Laser-Induced Fluorescence


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:

    Kongress:

    SAE 2013 World Congress & Exhibition ; 2013


    Erschienen in:

    Erscheinungsdatum :

    2013-04-08


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch