关键词: 声学, 消声器, 阻力系数, 压力损失, CFD

Abstract:

Muffler is a kind of allowing air flow through the device and can control the air flow noise, expounds its types, application and characteristics of the muffler has better acoustic performance and aerodynamic performance. Resistance coefficient of muffler is reflects the muffler to the size of the air flow resistance and pressure loss. Using computational fluid dynamics (CFD) method to calculate the resistance coefficient, and the experimental verification, to prove the CFD calculation method in the muffler drag coefficient calculation is feasible. In a machine factory production of forklift muffler as an example, the resistance coefficient was calculated by the CFD, analyze the deficiency of the original design,and improve, reduce the resistance coefficient, improve the aerodynamic performance. Resistance coefficient is used to study the silencer performance, has the certain application value in engineering practice.