Study on influence of intake or exhaust pressure on turbocharged opposed-piston two-stroke engine

For the requirements of the performance matching test of an Opposed-Piston Two-Stroke Engine, the software package of GT-Power was used to establish a one dimensional simulation model which was verified by the experimental data. Considering the main effect of intake and exhaust pressure difference on uniflow scavenging, these different operating conditions were calculated below: (1) To analyze the effect of intake pressure on the trapping ratio, the amount of the acquisition air and the specific fuel consumption when the exhaust back pressure was maintained constant. (2) To investigate the influence of exhaust pressure on the specific fuel consumption, the pressure difference and the trapping A/F when the delivery ratio was maintained constant. The result reveals that the intake pressure has a significant effect on the specific fuel consumption. When the delivery ratio increases by 0.2.The specific fuel consumptions will increase by 0.7%, 1.3% and 1.8% respectively. And the specific fuel consumptions at three cases will be minimum when the exhaust pressure is maintained within 160 kPa~170 kPa.