Manifold Configuration Effects on Root-Mean-Square Turbulent Velocity in a Spark Ignition Engine

The present study aims to simulate the non-reacting flow within the cylinder of a two-stroke spark ignition internal combustion engine (SIE) utilizing gasoline direct injection (GDI). A computational fluid dynamics (CFD) analysis was employed to forecast the turbulence levels of the in-cylinder flow, including the root-mean-square (RMS) turbulent velocity. The three-dimensional model was developed using ANSYS-FLUENT. The investigation examined the intake manifold inclination angles of 0°, 10°, 20°, 30°, and 40° for two different types of single-intake port engines (I and II) and a single-type double-intake port engines, that are presented at an engine speed of 1500 rpm. The findings revealed that the highest RMS turbulent velocities occurred at a 30° inclination for the double-intake engine, while the single-intake engines (I) and (II) showed peak velocities at 0° and 10°, respectively. Furthermore, in single-intake engine (I), the RMS turbulent velocity was found to be 38.7% greater than that of the double-intake engine, and single-intake engine (II) exhibited a 35% increase compared to single-intake port (I).