Present knowledge of the velocity of the fuel in diesel sprays is quite limited due to the obscuring effects of fuel droplets, particularly in the high-density core of the spray. In recent years, x-ray radiography, which is capable of penetrating dense fuel sprays, has demonstrated the ability to probe the structure of the core of the spray, even in the dense near-nozzle region. In this paper, x-ray radiography data was used to determine the average axial velocity in diesel sprays as a function of position and time. Here, we report the method used to determine the axial velocity and its application to three common-rail diesel sprays at 250 bar injection pressure. The data show that the spray velocity does not reach its steady state value near the nozzle until approximately 200 μs after the start of injection. Moreover, the spray axial velocity decreases as one moves away from the spray orifice, suggesting transfer of axial momentum to the surrounding ambient gas.


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    Titel :

    Determination of Diesel Spray Axial Velocity Using X-Ray Radiography


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Kastengren, Alan L. (Autor:in) / Powell, Christopher F. (Autor:in) / Wang, Jin (Autor:in) / Im, Kyoung-Su (Autor:in) / Cheong, Seong-Kyun (Autor:in) / Riedel, Thomas (Autor:in) / Liu, Xin (Autor:in) / Wang, Yujie (Autor:in)

    Kongress:

    SAE World Congress & Exhibition ; 2007



    Erscheinungsdatum :

    2007-04-16




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch


    Schlagwörter :


    Determination of diesel spray axial velocity using x-ray radiography

    Kastengren,A.L. / Powell,C.F. / Cheong,S.K. et al. | Kraftfahrwesen | 2007


    Characterizing Spray Behavior of Diesel Injection Systems Using X-Ray Radiography

    Ramírez, A. I. / Kastengren, A. L. / Powell, C. F. et al. | SAE Technical Papers | 2009


    Characterizing spray behavior of diesel injection systems using x-ray radiography

    Ramirez,A.I. / Som,S. / Aggarwal,S.K. et al. | Kraftfahrwesen | 2009


    Diesel Spray Penetration and Velocity Measurements

    Hillamo, H. / Sarjovaara, T. / Vuorinen, V. et al. | British Library Conference Proceedings | 2008