Validation of Particle Tracking Based Method to Study the Distribution of Gases Injected into the Intake Manifold

In this study, validity and accuracy of the particle tracking method for estimating the distribution of recirculated gases between intake manifold runners have been investigated. For this purpose, several experiments have been performed on EF7-TC engine on various working conditions and with different rates of recirculated gas injection. The experimental method is designed based on the LPG gas injection and its effect on the amount of λ of each cylinder exhaust gases. Contribution of each cylinder of the injected gas is determined by performing a simple calculation on the measured values obtained from experiments. In addition the numerical results are calculated by using the boundary conditions derived from 1-D model which is calibrated with the EF7-TC engine. In order to better compare and evaluate the results, based on experiences of previous researches, four different injection points on the intake manifold was considered. Results comparison showed the particle tracking method can qualitatively predict the distribution of recirculated gases between the intake manifold runners with a high confidence level. Only one qualitative difference between experimental and numerical results is observed. Besides, it is revealed that with decreasing the recirculated gas rate the accuracy of particle tracking method is enhanced and differences between experimental and numerical results are decreased. In addition, by comparing the results of four injection points it was showed that the particle tracking method is more accurate for injection points which distribute recirculated gases more uniformly.