新型净化消声器的声学及流场特性数值仿真分析

Acoustic and flow field characteristics numerical simulation analysis of purification muffler

汽车发动机进排气噪声是汽车主要噪声源之一,汽车尾气的排放会导致PM2.5浓度的升高,造成环境污染问题.在进排气系统上使用净化消声器可以有效地降低汽车进排气噪声和尾气浓度.传统的净化消声器设计都是将催化转化载体与消声器作为2个独立的部分进行设计,加大了生产成本,增加了安装空间.由于催化转化载体的蜂窝结构可以视为多孔介质,具有一定的消声作用,因此,设计出一种改进之后的新型净化消声器,通过将载体放入消声器内部,形成一个统一的结构,在假定消声器的净化作用的情况下,运用声学及流场的数值仿真分析消声器的传递损失和压力损失,结果证明新型净化消声器既节省了空间,又达到了消除噪声的目的.

The inlet and exhaust noise of automotive engine is one of the main noise sources of automobile noise.Automobile exhaust emissions will result in the increase of PM2.5concentration,causing environmental pollution.The most effective way to control vehicle noise and reduce exhaust gas concentration is to use purifier muffler on the inlet and exhaust systems.The traditional design is always to separate the catalytic converter carrier and muffler as two individual parts,increasing the cost of production and the installation space.Since the honeycomb structure of the catalytic converter carrier can be regarded as porous media which has the effect of eliminating noise,the new type of purification muffler by the improved will be introduced in this paper,which can be placed inside the muffler to form a united structure.On the assumption that it effects,the acoustic and flow field numerical simulation is used to analyze the transmission loss of muffler and pressure loss,and the result proves that the new type of purification muffler can not only save space,but also have exhaust and muffler eliminating effect.