A COMPUTATIONAL STUDY OF IN-CYLINDER FLOW CHARACTERISTICS IN TWO STROKE SIE WITH DOUBLE INTAKE MANIFOLDS AT DIFFERENT INCLINATION ANGLES

This investigation is carried out to simulate the in-cylinder non-reacting flow of a two stroke spark ignition internal combustion engine (SIE) with gasoline direct injection (GDI). Computer Aided Design (CAD) model was built based on the LUPOE-2D two stroke SIE geometries that had been used in experimental previous work. The computational fluid dynamics (CFD) analysis technique is used to predict in-cylinder flow turbulence levels, including root-mean square (RMS) turbulent velocity. The three dimensional domain is created using FLUENT-ANSYS 14.0. The mathematical model is validated against previous experimental data. The intake manifold inclination angles of 0, 10, 20, 30 and 40 o are investigated of double intake manifold at engine speed of 1500 rpm. The results indicate that the highest RMS turbulent velocities are achieved at 30 o inclination angle of the inlet manifold at the crank angles of 24, 17, 10 o before top dead center BTDC and 0 o at top dead center TDC. Also, it is found that, the maximum RMSs occur at 0.18 of the radius of the cylinder at crank angle of 24 o BTDC but at 0.25 of the radius at crank angles of 17, 10 o BTDC and 0 o at TDC.