In recent years, the development of marine turbochargers for two-stroke engines has shifted toward higher volume flow turbocharger designs. Consequently, noise levels from these turbochargers have also tended to increase, making it necessary to achieve reduced noise while satisfying performance requirements. One method for reducing noise is the use of silencers, which are also installed in MET turbochargers. As design requirements become increasingly stringent, Mitsubishi Heavy Industries, Ltd. has made efforts to develop silencers and associated design tool by utilizing analysis and measurement technologies, aiming to acquire capabilities to achieve a silencer design that is balanced at a high level. Through various tests, including operation as a turbocharger, the performance of the new silencer has been evaluated. In addition, it is expected that silencer designs capable of meeting various needs, such as higher performance and lower noise, can be realized. This report describes the results of these efforts.
