Effects of outlet pipe transition circular arc on properties of reactive muffler and its application

Based on the layout principles of inlet and outlet pipes, using the cavity acoustic modes to design muffler can get good acoustic attenuation, and for the inlet and outlet pipes are not coaxial, the pressure loss is larger when it is caused by the blocked air flow. Taking the expansion chamber and flow-reversing chamber as examples, firstly, comparative study about the effects of chamfer transition and circular arc transition on the pressure loss and transmission loss were made based on the finite element method. The results showed that the smooth transition of outlet pipe could decrease the pressure loss and did not affect the transmission loss at the same time; moreover, the properties of muffler with circular arc transition were much better than those of chamfer transition. On this basis, the coupling influences of transition circular arc radius and muffler size on the pressure loss and transmission loss were analyzed.