Abstract
Two mufflers of single exhaust muffler and double exhaust muffler were researched based on the method of AML technology of acoustic simulation software LMS Virtual lab and got transmission loss graph of the two mufflers, indicating that the single exhaust muffler had better effect of noise reduction. Then the fluid simulation was carried out on two mufflers and velocity and pressure cloud maps were draw based on the method of computational fluid dynamics in FLUENT. It is pointed out that the double exhaust muffler is slightly greater than the single exhaust muffler on pressure loss, this is because the airflow in single exhaust muffler is mainly jet flow and the pressure loss is mainly local pressure loss, while the airflow of double exhaust muffler is mainly rotary flow and the pressure loss is mainly frictional pressure loss. The impact that the airflow has on the cavity of the double exhaust muffler is higher.
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