Research On Resistance Characteristics Of Marine Exhaust Muffler

The structure and the aerodynamics performance of marine exhaust muffler is one of the important aspects when the diesel engine is installed on the ship. It requires less pressure loss. At the same time, the dimension of the marine exhaust muffler must be as small as possible, so that the diesel engine can work well. In order to offer reliable basis, in this article some numerical simulations of the resistance characteristics on the exhaust muffler are carried on according to the requirements mentioned above.In this article the numerical simulation is used in stead of the traditional research method of experimentation because the latter one consumes a lot of material resources and financial resources. The results of numerical simulation of flow fields of the archetype of exhaust muffler were analyzed and a remodelled exhaust muffler was finalized the design. For region of high resistance, the structure of inside of the archetype of exhaust muffler was adjusted with multi-scheme, but the shape was kept. According to the characteristics of the flow fields, unreasonable structures have been improved to obtain the exhaust muffler with the better performance.The pressure loss of remodelled exhaust muffler was decreased by 27% as compared with that of original one. The experiment model that scale is 1 to 2.5 was made. Model experiment results show that numerical simulation scheme has gratifying precision and is very effective for forecast of resistance characteristics of marine exhaust mufflers.