Flow Analysis on Formation of Back-pressure in Exhaust System Applying Electronic-variable Valve

In the present study, the Conducting copy device was made as considering the position of electronic-variable valves in the exhaust system. Using the device, which was made to be similar to an actual engine, basic testing was conducted. Based on these results, ANSYS analysis was performed. As for the analysis method, 5 angle variables for opening angle and 6 flow variables were used. As for analysis conditions, analysis was conducted based on the data from the basic testing. For increased precision of results, analysis was repeated 5 times. Results of analysis according to the opening angle of the valve showed that the maximum pressure range and maximum velocity around the valve increased with the angle. Also, analysis according to flow showed that maximum pressure range increased with flow, and formation of low pressure behind the valve due to development of flow was pronounced. Therefore, through the present study, it was concluded that the angle or exhaust flow of electronic-variable valves impact the formation of bask pressure in exhaust systems.