Exhaust Gas Pressure and Flow Velocity Analysis of the Conical Silencer High Performance Low Noise Exhaust Muffler

This study aims to determine the exhaust gas pressure and flow velocity of the conical silencer muffler compared to various types of muffler commonly used in the market. Conical silencer muffler developed to obtain high performance and low noise for internal combustion engine. Analysis of flow velocity and pressure used CFD method, the input fluid velocity parameter of 12000 mm/s with Siemens NX 10 software. Four exhaust mufflers have been designed in this study, conical silencer muffler, free flow muffler, a db killer installed in free flow muffler, and OEM muffler. The results of the analysis that have been carried out shown the conical silencer muffler has a max flow rate of 31200 mm/s with a pressure of 0.713 KPa, the OEM muffler has a flow rate of 47500 mm/s with a pressure of 4.250 KPa, the free flow muffler has a flow rate of 26500 mm/s with a pressure of 0.471 KPa, while the free flow muffler with db killer has a flow rate of 123000 mm/s with a pressure of 28.4 KPa. Based on these data, the performance of the free flow muffler was used as a benchmark for the performance of other mufflers. Conical silencer muffler has a flow difference of 4700 mm/s (18%) and a pressure difference of 0.24 KPa (51%) higher than free flow muffler, OEM muffler has a higher flow difference of 21000 mm/s (79%) and a pressure difference of 3.78 KPa (802%), free flow muffler with db killer has a higher flow difference of 96500 mm/s (364%) and a pressure difference of 27.93 KPa (5930%) compared to free flow muffler. Based on these data, it can be concluded the conical silencer muffler can generate performance near to the free flow muffler.