Simulation model research and performance analysis of array mufflers

In order to study the acoustic attenuation and aerodynamic performance of the new type of array muffler, three mufflers are selected for the test and simulation model research. The mathematical models of muffler pressure loss and insertion loss based on the method of pipeline acoustic mode are established, in which the influence of the perforated plate is considered, and the model is verified by test results. On this basis, the flow of airflow in the muffler and the influences of airflow velocity and muffler construction on the insertion loss are analysed. The results show that when the noise value at the muffler entrance is large, the airflow velocity of 0 to 10 m/s has little effect on the insertion loss. The insertion loss increases with the increase of the length of the sound absorber and the decrease of the spacing.