Particle image velocimetry measurements of the in-cylinder flow in an optically accessible single-cylinder research engine were taken to better understand the effects of intake pressure variations on the flow field. At a speed of 1500 rpm, the engine was run at six different intake pressure loads from 0.4 to 0.95 bar under motored operation. The average velocity fields show that the tumble center position is located closer to the piston and velocity magnitudes decrease with increasing pressure load. A closer investigation of the intake flow near the valves reveals sharp temporal gradients and differences in maximum and minimum velocity with varying intake pressure load which are attributed to intake pressure oscillations. Despite measures to eliminate acoustic oscillations in the intake system, high-frequency pressure oscillations are shown to be caused by the backflow of air from the exhaust to the intake pipe when the valves open, exciting acoustic modes in the fluid volume. This phenomenon is much stronger in the throttled-load cases because of the high differential between exhaust and intake gases. In addition, 1-D simulations of the engine at varying intake pressures and pipe geometries provide insight into the interactions between the pressure variations, high-frequency oscillations, and intake flow.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    The Effects of Intake Pressure on In-Cylinder Gas Velocities in an Optically Accessible Single-Cylinder Research Engine


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:

    Kongress:

    WCX SAE World Congress Experience ; 2020



    Erscheinungsdatum :

    14.04.2020




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    The Effects of Intake Pressure on In-Cylinder Gas Velocities in an Optically Accessible Single-Cylinder Research Engine

    Welch, Cooper / Schmidt, Marius / Keskinen, Karri et al. | British Library Conference Proceedings | 2020


    The Effects of Intake Pressure on In-Cylinder Gas Velocities in an Optically Accessible Single-Cylinder Research Engine

    Welch, Cooper / Schmidt, Marius / Keskinen, Karri et al. | British Library Conference Proceedings | 2020


    Correlation of Cycle-Resolved Flame Kernel Growth and Cylinder Pressure in an Optically-Accessible Engine

    Weaver, Corey E. / Santavicca, Domenic A. | SAE Technical Papers | 1992


    Engine with Optically Accessible Cylinder Head: A Research Tool for Injection and Combustion Processes

    Juliá, E. / García, J. M. / Martínez, S. et al. | SAE Technical Papers | 2003