某柴油机排气净化消声器结构单元声学性能研究  

Study on the acoustic performance of the structural unit of a diesel engine exhaust purification muffler

作　　者：伏军 曹玉刚 王伟晟 李放 FU Jun;CAO Yugang;WANG Weisheng;LI Fang(School of Mechanical and Energy Engineering,Shaoyang University,Shaoyang 422000,China;Hunan Key Laboratory of Intelligent Manufacturing of High Efficiency Power System,Shaoyang 422000,China)

机构地区：[1]邵阳学院机械与能源工程学院,湖南邵阳422000 [2]湖南省高效动力系统智能制造重点实验室,湖南邵阳422000

出　　处：《邵阳学院学报（自然科学版）》2023年第6期17-25,共9页Journal of Shaoyang University：Natural Science Edition

基　　金：邵阳学院研究生科研创新项目(CX2022SY018)。

摘　　要：为减少柴油机尾气及噪声污染,以某单缸柴油机为研究对象,提出一种新型排气净化消声器方案。基于计算流体动力学(computational fluid dynamics,CFD)技术,运用数值模拟的方法,对排气净化消声器进排气管布局、净化基体布局方式和有无穿孔隔板影响因素进行分析研究。结果表明,这些影响因素的改变均能对排气净化消声器噪声传递损失产生较大影响,其中,排气净化消声器不同进排气管布局,对消声器的声学性能有较大影响,斜插管的布局对传递损失有很大提升,消声效果较好,尤其体现在中低频段以及中高频段传递损失提高约9.0 dB(A)。In order to mitigate exhaust emissions and noise pollution stemming from diesel engines,the study focused on a single-cylinder diesel engine and introduced a novel exhaust purification and noise attenuation scheme.Leveraging computational fluid dynamics(CFD)technology and numerical simulations,i.e.,a comprehensive analysis was conducted to explore the influence of factors such as the inlet and outlet pipe layout,purification substrate arrangement,and the presence of perforated baffles on the exhaust purification and noise attenuation device.The findings demonstrate that alterations to the influencing factors significantly impact the transmission loss of the exhaust purification and noise attenuation device.In particular,different layouts of inlet and outlet pipes within the exhaust purification and noise attenuation device exhibit substantial influence on its acoustic performance.Notably,the oblique pipe configuration results in a considerable enhancement of transmission loss,leading to superior noise reduction,particularly in the mid-to-low frequency and mid-to-high frequency ranges,with an increase in transmission loss of approximately 9.0 dB(A).

关 键 词：柴油机 净化消声器 传递损失 

分 类 号：TK421.6[动力工程及工程热物理—动力机械及工程]