Exhaust Gas Recirculation (EGR) method has already shown its benefits on controlling NOx emissions in internal combustion engines. By using EGR, power reduction and increase of other pollutants may be appeared; therefore use of this method needs an accurate regulation system limiting EGR cylinder-to-cylinder maldistribution. On the other hand, emission law limitations make engine manufacturers to recycle back blowby gases into the cylinders. As the same reasons, mentioned above, homogeneous distribution of blowby gases show better performance and more emission reduction. Geometrical parameters and injection location of EGR/blowby have substantial effects on homogenous cylinder-to-cylinder distribution of EGR/blowby. Therefore a numerical simulation of air flow with another species gas (for example CO2 injection inside intake manifold as EGR/blowby) is needed to evaluate the maldistribution quantitatively. In this study, the flow field of compressible and unsteady turbulent flow is solved for different injection locations to compare EGR/blowby maldistribution of each location. Although this method is practicable, it is time consuming because of various injection locations and long solution duration. Furthermore a new method based on particle tracking is proposed which decreases the time and effort needed to find appropriate injection locations.

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