Numerical Analysis of the Flow Field and Temperature Field Inside the Muffler

The flow field and temperature field inside a typicallystructured muffler were studied by numerical simulation, and the effect of the flow velocity and temperature on the performance of the muffler was analyzed. The analysis of the flow field and temperature field proves that the following principles should be taken into account in muffler design: the total flow area of the holes in the perforated pipe should be larger than the cross sectional area of the exhaust pipe; taking full advantage of the converse function between the air flow and the sound wave motion can improve the anechoic performance; uniform transition structure at the entrance part of the muffler is suggested to decrease the pressure loss; the diameter of the tail pipe should not be too small.