A “thermal pulse” technique has been used to measure thermal diffusivity and thickness of combustion chamber deposits continuously during engine operation. The technique uses a fast-response thermocouple junction at the combustion chamber wall surface and a simplified model which describes the effect of the deposit on the measured temperature cycle. Results from 13 tests using four different fuels and three different commercial additive packages are discussed in the paper. Thermal diffusivity values in the range of 0.85 - 4.2 x 10-7 m2s-1 were measured. Deposit growth is normally a continuous process. However, occasionally deposit flaking events characterised by a sudden significant decrease in deposit thickness were observed.


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    Titel :

    A Technique to Measure Thermal Diffusivity and Thickness of Combustion Chamber Deposits In-Situ


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Hopwood, A. B. (Autor:in) / Kalghatgi, G. T. (Autor:in) / Chynoweth, S. (Autor:in)

    Kongress:

    International Fall Fuels and Lubricants Meeting and Exposition ; 1998



    Erscheinungsdatum :

    19.10.1998




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    A technique to measure thermal diffusivity and thickness of combustion chamber deposits in-situ

    Hopwood,A.B. / Chynoweth,S. / Kalghatgi,G.T. et al. | Kraftfahrwesen | 1998


    A Technique to Measure Thermal Diffusivity and Thickness of Combustion Chamber Deposits In-Situ

    Hopwood, A. B. / Chynoweth, S. / Kalghatgl, G. T. et al. | British Library Conference Proceedings | 1998


    Determination of Thermal Conductivity and Thermal Diffusivity of Engine Combustion Chamber Deposits

    Hafnan, M. / Nishiwaki, K. / Society of Automotive Engineers of Japan | British Library Conference Proceedings | 1993