The content of this paper deals with an analysis of the potential of injection rate shaping for a medium speed ship diesel engine. In a first step, an appropriate injection system concept, based on a targeted use of pressure waves in the high pressure system, was developed and successfully implemented applying available CR-components. The functional testing of the new research injection system did show a high degree of flexibility with respect to the generation of different injection rate shapes, thereby confirming the performed 1D hydraulic simulations. It could be proven that either SQUARE-, RAMP- or BOOT-type injections can be generated with a very good repeatability regarding shape and injected quantity. On the basis of engine tests with a reference CR-injection system, the impact of injection rate shaping was investigated at mean indicated pressures of 11.5 bar and 17.5 bar corresponding to 50% and 75% load conditions, respectively. At 11.5 bar pmi a considerable emission reduction (e.g. 70% decrease of FSN) was reached when applying a RAMP-type injection rate. In contrast, at a pmi of 17.5 bar no significant advantages were found in comparison to the reference system. At this load condition a SQUARE-type injection shape showed to offer the best compromise. The obtained results clearly show that a targeted hydraulic adaptation of a common-rail injection system can lead to benefits regarding engine emissions and efficiency. It has to be emphasized that flexible injection rate shaping comprises a high potential for large diesel engines. Depending on the particular load condition an optimum injection rate shape may be generated allowing low emissions and high efficiency in the entire engine operating range. It is furthermore possible to react instantly in case of transient load changes. Considering the positive impact of injection rate shaping on soot at part load conditions, future work should focus on the investigation of this technology in combination with EGR and multiple injection strategies.


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    Titel :

    Hydraulic measures to improve common-rail injection system performance - Impact of injection rate shaping on emissions of a medium speed diesel engine


    Beteiligte:
    Fink, Christian (Autor:in) / Drescher, Martin (Autor:in) / Rabe, Jean Rom (Autor:in) / Harndorf, Horst (Autor:in)


    Erscheinungsdatum :

    2013


    Format / Umfang :

    10 Seiten, 12 Bilder, 11 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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