This paper presents an experimental study of the cycle-averaged, local surface heat transfer, from the exhaust gases to a straight pipe extension of the exhaust port of a four-cylinder spark-ignition (SI) engine, over a wide range of engine operating conditions, from 1000 rpm, light load, through 4000 rpm, full load. The local steady-state heat flux was well correlated by a Nusselt-Reynolds number relationship that included entrance effects. These effects were found to be the major contributor to the local heat transfer augmentation.The Convective Augmentation Factor (CAF), which is defined as the ratio of the measured heat flux to the corresponding heat flux for fully-developed turbulent pipe flow, was found to decrease with increasing Reynolds number and increasing axial distance from the entrance of the test section. The CAF values at the downstream location were found to agree surprisingly well with corresponding values, found in the takedown pipe and tailpipe by other investigators.


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    Titel :

    Cycle-Averaged Heat Flux Measurements in a Straight-Pipe Extension of the Exhaust Port of an SI Engine


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Alkidas, A. C. (Autor:in) / Sangeorzan, B. P. (Autor:in) / Farrugia, M. (Autor:in)

    Kongress:

    SAE 2006 World Congress & Exhibition ; 2006



    Erscheinungsdatum :

    2006-04-03




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





    2006-01-1033 Cycle-Averaged Heat Flux Measurements in a Straight-Pipe Extension of the Exhaust Port of an SI Engine

    Farrugia, M. / Alkidas, A. C. / Sangeorzan, B. P. et al. | British Library Conference Proceedings | 2006


    Steady-State Local Heat Flux Measurements in a Straight Pipe Extension of an Exhaust Port of a Spark Ignition Engine

    Alkidas, Alex C. / Sangeorzan, Brian P. / Balzan, Noel | SAE Technical Papers | 2007



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