A homogenous combustion catalyst for fuel efficiency improvements in diesel engines fuelled with diesel and biodiesel

    Research output: ThesisDoctoral Thesis

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    Abstract

    [Truncated abstract] The ferrous picrate based homogeneous combustion catalyst has been claimed to promote diesel combustion and improve fuel efficiency in diesel engines. However, the reported fuel savings were controversial. Moreover, a lack of understanding of the working mechanism of the catalyst in diesel combustion processes so far has hindered its widespread applica-tion. On the other hand, the effect of the catalyst on biodiesel combustion has never been scientifically studied and presents a new area regarding the application of the catalyst. The present research aims to systematically study the effect of the catalyst on the fuel efficiency of diesel and biodiesel in diesel engines and to understand its working mechanisms. The specific objectives of this research include a systematic study on the effect of the catalyst on fuel efficiency and combustion characteristics of diesel and biodiesel in diesel engines, an investigation into the working mechanisms of the catalyst in diesel and bio-diesel combustion processes through both experimental and mathematical modelling studies on single droplets, and a study on the chemical kinetic effect of iron atoms on the diesel combustion processes. To accomplish these objectives, the influence of the catalyst on fuel efficiency of diesel and biodiesel as a function of engine speed, load and catalyst dosing ratio was first studied using both a laboratory small single cylinder engine and a large industrial scale four cylinders engine. Then both mathematical modelling and experi-mental studies on the combustion characteristics, including ignition delay periods, burnout time, burning rates and flame temperature, of single droplets of diesel and biodiesel were performed. Lastly, a kinetic modelling study of the effect of iron on the ignition and combustion characteristics of diesel was carried out using CHEMKIN PRO.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Publication statusUnpublished - 2012

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