The origin and development of swirl center precession in engine flows has been investigated in a steady flow rig, with and without a porous plate simulating a stationary piston, and in a model engine motored at 200rpm; swirl, in all cases, was generated by means of 60° vanes located in the axisymmetric inlet port. The swirl center performs a helical motion that originates as an instability in the forced-vortex core from its interaction with the axial flow at a free stagnation point and develops in the engine from the piston towards the cylinder head; an opposite trend has been observed in the steady flow case with the open-ended cylinder. In the ensemble-averaged measurements, swirl center precession has been identified by the increased tangential velocity fluctuations around the off-centre zero swirl velocity. The characteristic frequency of the periodic swirl center motion was found to scale linearly with induction air mass flowrate over the investigated range of engine speeds (180-700rpm).


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Swirl Center Precession in Engine Flows


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    SAE International Congress and Exposition ; 1987



    Erscheinungsdatum :

    01.02.1987




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Swirl Center Precession on Engine Flows

    Arcoumanis,C. / Hadjiapostolou,A. / Whitelaw,J.H. | Kraftfahrwesen | 1987


    Precession difference engine

    ZHANG JING | Europäisches Patentamt | 2025

    Freier Zugriff

    Flows with Swirl

    Summerfield, Martin | AIAA | 1980


    Duct flows with swirl

    TSAI, TOMMY / LEVY, RALPH | AIAA | 1987


    Kinetic energy and dissipation rate spectra of high-swirl and low-swirl internal combustion engine flows

    Fajardo,C.M. / Sick,V. / Western Michigan Univ.,US et al. | Kraftfahrwesen | 2009