EGR cooler design

Abstract

During the EGR cooler performance is a key issue that a ects the function of EGR system as an anti-pollutant device. There is a signi cant concern to guarantee function of these devices during useful life of vehicle. Decrease of thermal e ciency and increase of gas pressure drop caused by soot deposition implies higher EGR gas temperature and lower EGR gas ow. Diesel engines are important power train solution for heavy duty vehicles and diesel power plants. Hence in this study theoretical analysis and CFD simulation of EGR cooler is carried out for improved emission and high heat recovery from engine exhaust. Use of the Cooled Exhaust Gas Recirculation (EGR) system is one of the most e ective techniques currently available for reducing NOx and PM emissions. It was observed that there is good agreement between experimental results and prediction from the development model. An important goal in diesel engine research is the development of a means to reduce the emissions of nitrogen oxides (NOx). The use of a cooled exhaust gas recirculation (EGR) system is one of the most e ective techniques currently available for reducing nitrogen oxides. Since PM (Particulate Matter) fouling reduces the e ciency of an EGR cooler, a tradeo exists between the amount of NOx and PM emissions, especially at high engine loads. In the present study, we performed engine dynamometer experiments and numerical analyses to investigate how the internal shape of an EGR cooler a ects the heat exchanger e ciency. Heat exchanger e ciencies were examined for corrugated EGR coolers. The temperature and pressure distributions inside these EGR coolers were obtained in three dimensions using the numerical package program ANSYS. 1