PR457-22210-R01 Effects of Inlet Port Geometry on MCC Mixing Sensitivity Study

Lean burning large bore natural gas two-stroke engines have remained critical components of the North American natural gas pipeline ecosystem for decades and will continue to persist as vital means of natural gas transportation well into the coming years. As increasing lean ignition limits are explored, Pre-Combustion Chambers (PCCs) serve as pathway to increased stability and repeatability of combustion as well as substantial engine emissions reduction. This study aims to further research the interaction between PCCs and the main combustion chamber (MCC) by investigating the sensitivity of in-cylinder mixing to changes in the geometry of intake manifolds and port design. A CFD model of a Cooper Ajax E-565 large bore lean burn two-stroke was used for this study. Several novel intake manifold designs were created to promote distinct flow characteristics and examined extensively for overall air flow results, mixing quality, general cycle performance, impact on residual methane, and impact on NOx production.