Abstract
This research applied the KIVA-3V (Release 2) 3-Dimentional Reactive Flow Code developed by USA Los Alamos National Laboratory on the diesel engine combustion phenomena. The preprocessor (K3prep) constructs the grids on the intake manifold, the cylinder chamber, the bowl on piston service, and the exhaust manifold. The experimental measured engine geometry data and engine operating conditions are their converted into the input file (itape 5).
The baseline is set at 1800 rpm (engine speed) and eqivalence ratio Ø = 0.25 (engine load). The engine operating conditions are then changed to higher engine speeds and engine loads. The simulated cylinder pressures and heat release rates are compared to the experimental results. The dynamic output (O~720 CA) is post processed by K3POST code and and the Tecplot software. The flow streak line, the pressure field and the temperature distributions inside the cylinder chamber are first studied. Then the various gas concentration (NOx, HC, CO) and the turbulent kinetics distribution are then displayed at sequential crank angles.
The KIVA-3V results show the acceptable similarities of the cylinder pressures and heat release rates between simulation and experimental works. The chemical reactions and flow field inside the cylinder and demonstrated in 3D continuous graphics. This study gives us powerful insight into the non-measurable phenomena inside the diesel engine.