On Design of Small Engine Muffler Gasoline

Key words: 
• small engine、muffler、fluid dynamics、simulating calculation

Abstract: According to the theory of muffler design ,a research has been done aiming at designing the small engine muffler of structure .The fluid dynamics simulation software -fluent has been used to analyze the flow field ,velocity streamline ,pressure fields and temperature fields in the muffler .Contrasted multiple-data of muffler's perforated diameter size which impact to aerodynamic performance of muffler .The study shown that diameter size of muffler made a difference to or pressure loss .Pore diameter was too small , would cause larger pressure loss drop .Pore diameter increased to a certain degree ,the pressure didn't loss . This moment ,it was not useful for changing pressure drop to change diameter size of perforation plate . When the diameter size of perforation plate muffler was 6 millimeter ,the pressure drop was minimize .The results of experimental testing of the improved muffler show that the muffler was lower noise than original o ne .