Particle image velocimetry (PIV) is used to investigate the structure and evolution of the mean velocity field in the swirl (r-θ) plane of a motored, optically accessible diesel engine with a typical production combustion chamber geometry under motoring conditions (no fuel injection). Instantaneous velocities were measured were made at three swirl-plane heights (3 mm, 10 mm and 18 mm below the firedeck) and three swirl ratios (2.2, 3.5 and 4.5) over a range of crank angles in the compression and expansion strokes. The data allow for a direct analysis of the structures within the ensemble mean flow field, the in-cylinder swirl ratio, and the radial profile of the tangential velocity. At all three swirl ratios, the ensemble mean velocity field contains a single dominant swirl flow structure that is tilted with respect to the cylinder axis. The axis of this structure precesses about the cylinder axis in a manner that is largely insensitive to swirl ratio. Higher swirl ratios reduce the cycle-to-cycle variability in the orientation of this structure. The tangential velocity profiles are well represented by the Bessel function profile often used to initialize the tangential velocity in CFD codes. A value of 2.2 is recommended for the value of the parameter α which controls the shape of the Bessel function profile. During the compression stroke, the measured in-cylinder swirl ratios were similar to those determined from steady-state flow bench measurements. The swirl ratios decreased significantly after TDC, and continued to decline during the expansion stroke.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    PIV Measurements in the Swirl-Plane of a Motored Light-Duty Diesel Engine


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:

    Kongress:

    SAE 2011 World Congress & Exhibition ; 2011


    Erschienen in:

    Erscheinungsdatum :

    12.04.2011


    Format / Umfang :

    19 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    PIV Measurements in the Swirl-Plane of a Motored Light-Duty Diesel Engine

    Petersen, B. / Miles, P. / Society of Automotive Engineers | British Library Conference Proceedings | 2011


    In-Cylinder Velocity Field Measurements in a Motored Diesel Engine

    Puglisi, A. / Vafidis, C. / Cipolla, G. | SAE | 1987


    In-cylinder velocity field measurements in a motored Diesel engine

    Cipolla,G. / Puglisi,A. / Vafidis,C. | Kraftfahrwesen | 1987


    Measurements of Cylinder Liner Oil Film Thickness in a Motored Diesel Engine

    Richardson, Dan / Borman, Gary / Phen, Robert V. | SAE | 1993


    Measurements of cylinder liner oil film thickness in a motored diesel engine

    Phen,R.V. / Richardson,D. / Borman,G. et al. | Kraftfahrwesen | 1993