The present work describes the development, construction and metrological use of an optical injection chamber test rig for the investigation of mixture formation in the diesel engine application. For investigation and development processes in the engine-engineering chain of events is a separated consideration of influence parameters on the fuel injection system of an internalcombustion engine of central importance, because this step contributes to the basic understanding of this primary system. In particular, the consideration of individual physical parameters such as pressure and temperature are in the foreground. In contrast to the engine, these parameters can be observed very selective and individual, but with comparable engine conditions, in an optically accessible pressure cell, which is also known as an injection chamber test rig. This work provides an application related background on the topic of injection chamber test rigs, which is relevant for the constructive design including the metrological application. It also illustrates how the newly developed injection test rig differs from previously known systems and what the main advantages of this new approach are. The intensive consideration of the constructed optical injection chamber test rig and its operation illustrates the necessity of a profound validation of the test rig, especially for reproducible and transferable results on combustion engine utilization. This includes the creation of engine-relevant measurement programs with the corresponding image data analysis and statistical error analysis. The metrological use of the validated test rig shows on the one hand the primary influencing variables on a diesel spray originated from a variation of pressure and temperature and on the other hand the influence of fuel composition on mixture formation. In particular, synthetic fuels (GtL), rapeseed oil methyl ester (FAME), rapeseed oil, and furthermore various commercial fuels and premium fuels are investigated. In this context characteristics of biogenic components which have an impact on the boiling characteristics of the fuel are regarded more closely. In these studies only the liquid phase is observed by Mie light scattering measurements. Additionally to the metrological applications of the optical injection chamber finally a newly developed spray model is presented. This model considers contrary to other models the reproduction of the nozzle outlet velocity and describes an optimized liquid phase distribution. The model is verified by the results of the measurement program.


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    Title :

    Optischer Einspritzkammerprüfstand zur Untersuchung der Dieselsprayausbreitung


    Contributors:


    Publication date :

    2014


    Size :

    147 Seiten, Bilder, Tabellen, 109 Quellen



    Type of media :

    Theses


    Type of material :

    Print


    Language :

    German