Study on double microperforated muffler for ventilation system in nuclear power plants

Noise from ventilation system is the main source in the main control room of nuclear power plants. Analyses the noise in main control room and points out that a new type of muffler which according with environmental requirements of nuclear power plant and having good muffler performance with wide band is needed. Develops a new type of muffler applied to ventilation system based on the study of multilayer microperforated plate absorber, and tests and numerically analyses the acoustic and aerodynamic performance. The result shows that the insertion loss achieves 25 dB in designing frequency and the pressure loss meets the design requirements and is less than that of the traditional impedance muffler.