Increasing the design level of muffler is of great significance for improving the quality of our country 's machinery. Insertion loss and pressure loss are two very important evaluation indicators for evaluating the muffler performance and aerodynamic performance.This paper uses COMSOL software to study the influence of the structure of the muffler unit on the velocity field and pressure field of the muffler.When the length of the insertion tube is the same,the flow velocity of the gas at the outlet of the muffler is substantially the same,and a gas flow"blind zone"occurs at the root position of the inner insertion tube. The pressure drop in the inlet cannula increases with the length of the insertion tube.When the inlet insertion tube length is 0,the length of the outlet insertion tube increases,the sound pressure at the inlet remains basically unchanged,and the sound pressure at the outlet changes, and at the inlet In the area,the sound pressure gradually decreases and there is a minimum value on both sides of the entrance of the expansion chamber.In the expansion chamber,the maximum sound pressure level occurs on both sides of the outlet position,and the smaller sound pressure level area decreases as the length of the outlet insertion tube increases.%提高消声器设计水平对于提升我国机械质量有重要的意义.插入损失和压力损失是评价消声器消声性能和空气动力性能的两个非常重要的评价指标.本文利用COMSOL软件研究消声单元结构对消声器速度场和压力场的影响.当插入管长度相同时,消声器的出口处气体流速基本相同,位于内插管根部位置出现气流"盲区".入口内插管的压降随插入管长度的增加而增加,当入口插入管长度为0时,出口插入管长度增加,入口处的声压保持基本不变,出口声压发生变化,且在入口区域,声压逐渐减小在扩张室入口两侧存在最小值.扩张室内,最大声压级发生在出口位置的两侧,且较小声压级区域随出口插入管长度的增加而减小.
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