Hydrogen as energy carrier has been identified as the most promising sustainable alternative to fossil fuels. From today's point of view the storage of liquid hydrogen offers the highest power density between those concepts available for automotive applications. In a H2-internal combustion engine (ICE) the fuel's potential of cooling energy can be used - by realizing a cryogenic mixture formation - to increase the power density significantly and to improve the efficiency without negatively affecting the raw emissions. Experimental as well as computational work on the cryogenic mixture formation and combustion has proven its usability for engine application. Moreover, a series of remarkable advantages have been demonstrated: Particularly at medium part-load and upper part-load the efficiency of the engine could be raised beyond the good efficiency of a quality controlled H2-ICE with warm hydrogen injection. This generates a practically usable advantage in fuel consumption. As expected, the higher volumetric mixture calorific value leads to a significantly higher power output when operating the engine in cryogenic mode at a constant air/fuel-ratio. The maximum power of the research engine could be increased by 25%, even while being restricted to the boiling temperature of LH2 (Liquid Hydrogen). At the same time the stability of the combustion is improved, knocking and glow ignition is suppressed. The compression ratio of a H2-ICE with cryogenic mixture formation can be significantly increased. The conflict between increasing overall efficiency and full-load behaviour can thus be eased. All these results could be achieved without adversely affecting the emission behaviour. At medium part-load and upper part-load the level of emissions can be lowered even remarkably. The experiences with cryogenic mixture formation lead to the conclusion that this concept shows convincing potential for the optimisation of H2-engines, only requiring moderate technical complexity at the same time.


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    Titel :

    Optimisation of a hydrogen internal combustion engine with cryogenic mixture formation


    Weitere Titelangaben:

    Optimierung eines Wasserstoff-Verbrennungsmotors mit kryogener Gemischbildung


    Beteiligte:
    Heller, K. (Autor:in) / Ellgas, S. (Autor:in)


    Erscheinungsdatum :

    2006


    Format / Umfang :

    10 Seiten, 12 Bilder, 1 Tabelle, 16 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch