U型波纹管在抗性消声器中应用可行性的实验研究  

A study on the feasibility of the application of the U-shaped corrugated Pipes in reactive mufflers

作　　者：薛飞[1] 孙蓓蓓[1] 陈建栋[1] XUE Fei;SUN Beibei;CHEN Jiandong(School of Mechanical Engineering,Southeast University,Nanjing,211189,China)

机构地区：[1]东南大学机械工程学院,南京211189

出　　处：《振动与冲击》2018年第20期230-236,共7页Journal of Vibration and Shock

基　　金：江苏省前瞻性联合研究(BY2014127-01);江苏省科技支撑计划(BE2014133)

摘　　要：抗性消声器广泛应用于车辆进排气系统中以消除中低频噪声,而如何在有限安装空间条件下实现抗性消声器的宽频带消声性能是抗性消声器研究的难点。提出了一种使用U型波纹管代替内插管的抗性消声器设计方案,旨在利用U型波纹管的带阻滤波特性提升抗性消声器在截止频率以上频带的消声性能。为验证U型波纹管在抗性消声器中应用的可行性,设计了两种不同结构参数且在消声频带上形成互补的U型波纹管,对U型波纹管消声器在不同入口流速条件下的插入损失与压力损失进行了测试分析。提出了综合提升系数η这一指标用来综合衡量应用U型波纹管前后消声器在插入损失和压力损失上的差异。结果表明:U型波纹管在抗性消声器中的应用,有效地拓宽了消声器的消声带宽,显著提高了抗性消声器的消声性能。U型波纹管的使用增加了抗性消声器的压力损失,一定程度降低了消声器的气动性能。U型波纹管在抗性消声器中应用后,优化系数η达到了1. 12～1. 13,表明了U型波纹管对提升消声器消声性能的贡献大于其在气动性能上带来的损耗。本文验证了U型波纹管在抗性消声器中应用的可行性,为抗性消声器的设计提供了新的思路。A reactive muffler is widely used to reduce the low-frequency noise generated by internal combustion engines,but it is often difficult to obtain ideal noise attenuation performance above the upper cutoff frequency range.This paper presented a case study on a novel application of U-shaped corrugated pipes in reactive muffler,which aimed to improve the noise attenuation performance above the upper cutoff frequency range.Typical performance parameters such as the insertion loss and pressure loss were experimentally evaluated.Besides,an index(improvement coefficientη)was proposed to weigh the improvement performance of corrugated pipes in noise attenuation and pressure loss.Results demonstrate that the application of U-shaped corrugated pipes in the reactive muffler significantly improves the noise attenuation performance above the upper cutoff frequency range and successfully extents the bandwidth of noise attenuation.In addition,the application of U-shaped corrugated pipes increases the pressure loss of the reactive muffler,reducing the aerodynamic performance of the muffler to a certain extent.Moreover,the overall improvement coefficientηreaches 1.12~1.13,indicating that the corrugated pipes make more contribution in noise attenuation than in pressure loss.In conclusion,this study verified that the application of U-shaped corrugated pipes in the reactive mufflers is feasible and acceptable,and it provides a novel method in the design of reactive mufflers.

关 键 词：抗性消声器 U型波纹管 截止频率 综合提升系数 

分 类 号：U464.134.4[机械工程—车辆工程] U467[交通运输工程—载运工具运用工程]