The effectiveness of scavenging, the displacement of residual combustion gases with fresh air, is examined in an advanced, high power-density diesel engine, consisting of a two-stroke, opposed-piston reciprocator with an ultra-high boost. KIVA-3, a three-dimensional code for modeling reactive flows with fuel injection, is used to study the effect of a variety design choices on scavenging. The parametric study includes the inclined angle of the intake ports, the exhaust port timing and size and the piston stroke-to-bore ratio. A baseline geometry of the opposed-piston engine is examined in detail, which models an existing mono-cylinder test rig. The baseline-design exhibits large asymmetries, nonsteady flow and large recirculation regions that degrade the scavenging. Significant improvement in the scavenging of the baseline design is observed with a uniform inclined angle of the inlet ports of about 20° and with a larger stroke-to-bore ratio (2.0 compared with 1.08).


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Three-Dimensional Computations of the Scavenging Process in an Opposed-Piston Engine


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    International Fuels & Lubricants Meeting & Exposition ; 1994



    Publication date :

    1994-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English






    Opposed-piston engine

    Nott, R.H.P. | Engineering Index Backfile | 1944


    Opposed-piston diesel engine

    Mueller, G.A. | Engineering Index Backfile | 1951


    Rotary opposed-piston engine

    Engineering Index Backfile | 1930