Simple mathematical model for the numerical simulation of formaldehyde and acetaldehyde formed in the exhaust of a combustion engine operating with ethanol as fuel

摘要

The following work presents the numerical simulation of the main aldehydes present in the exhaust of a 4-stroke internal combustion engine, which uses ethanol as fuel, varying the rotation speed from 2000 to 5000 rpm. The simulation consists of a first part made in a software specialized in engines where properties and initial concentrations are calculated that serve as input data to the mathematical model that calculates the concentration of formaldehyde and acetaldehyde, as well as their producers: ethane, methane and unburned ethanol in the exhaust duct. The simulation shows concordance in the trend of the substances analyzed with the data found in the literature. The formaldehyde and acetaldehyde concentrations calculated by the model are similar to those found in the literature, however, the concentration of unburned ethanol and, therefore, total acetaldehyde in the exhaust are lower than those reported by the different authors.