摘要
以湖北某烟厂除尘系统的进气口为研究对象,采用CFD软件Fluent和声学软件LMS Virtual.lab联合仿真建立带阀门除尘系统进气口模型,通过所建立数字化模型分析阀门气动噪声产生原因,探讨气体流经管内阀门产生气动噪声的特性,研究阀门开度对噪声的影响规律,并对阀门进行开孔结构优化。结果表明,除尘系统进气口的气动噪声主要集中于低频范围。阀门开度影响气动噪声的声压级,但不改变频谱特性,在30°~75°不同阀门开度下,阀门每增加15°,最大声压级下降差值分别为6.62、5.42、1.43 dB。最大声压级和声压级均值随阀门开孔的孔数增加而降低。在9孔情况下的声压级均值比无孔降低25.69%,相关结果可为基于多软件联合仿真在烟厂除尘系统进气口降噪设计提供参考。
Summary:The tobacco industry is one of the important pillar industries of national economy in China,and,with the expansion of tobacco factories as well as a larger number of high-speed unit equipment into the tobacco industry,noise pollution in the industry is becoming more and more prominent,in which the noise pollution in wrapping workshops is particularly serious.The noise source in such a workshop is mainly from the dust removal system,the noise characteristics of which are usually low to medium frequency noise,with strong penetration and energy difficult to attenuate.The air inlet end of the dust removal system is the closest to the workers,and the long time exposure of the workers to the noise environment will lead to damage of hearing organs as well as tinnitus,palpitation,sleep disorders,etc.Therefore,it is necessary to analyze the noise of the air inlet of the dust removal system as well as to optimize the structure of the air inlet to reduce the noise.Most of tobacco factories for the optimization of the noise reduction of the dust removal system is mainly done through the experimental method,but with the development of computer technology and numerical computation methods,the digital simulation method has become one of the most effective ways to solve complex engineering problems.Compared with the analytical method which is only applicable to the noise analysis of simple structures,it can be used to solve the aerodynamic noise of large and complex structures of air inlet ducts.At present,the research on the noise of the dust removal system of a tobacco plant mainly focuses on covering the pipe wall with acoustic materials and installing mufflers at the inlet and outlet of the pipe,etc.There are few researches on the noise reduction by optimizing the internal structure of the air inlet,and the establishment of a mathematical model to optimize the internal structure of the air inlet is a brand-new attempt.In this paper,the air inlet of the dust removal system in a tobacco factory in Hubei province is taken as the research object.The CFD software Fluent and the acoustic software LMS Virtual.lab are used to jointly simulate and establish an air inlet model of the dust removal system with a valve.Through the established digital model,the causes of the pneumatic noise of the valve are analyzed,and the characteristics of the pneumatic noise generated by gas flowing through the valve in the pipe are discussed.The influence rule of valve opening on noise is studied and the valve opening structure is optimized.The results show that the aerodynamic noise of the inlet is mainly concentrated in the low frequency range.Valve opening affects the sound pressure level of the pneumatic noise but does not change the spectral characteristics.Under different valve opening degrees from 30°to 75°,the difference of the maximum noise pressure level drop is about 6.62 dB,5.42 dB and 1.43 dB respectively,when the valve increases by 15°.The mean values of the sound pressure levels and the maximum sound pressure levels decrease with the number of valve opening.The mean sound pressure level with 9 holes reduces by about 25.69%compared with that without holes.The relevant results provide research ideas and practical cases for the noise reduction design of the air inlet of the dust removal system in a tobacco factory based on multi-software co-simulation.
作者
曾飞
汪舟
葛久志
王晓丽
王刚
谭理成
杨云珍
潘阳炼
ZENG Fei;WANG Zhou;GE Jiuzhi;WANG Xiaoi;WANG Gang;TAN Licheng;YANG Yunzhen;PAN Yangian(School of Automotive Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Parts Technology of Hyundai Automobiles,Wuhan 430070,China;Hubei Institute of Measurement and Testing Technology,Wuhan 430223,China;Shanghai Tobacco Machinery Co.,Ltd.,Shanghai 201206,China)
出处
《重庆理工大学学报（自然科学）》
北大核心
2023年第7期315-323,共9页
Journal of Chongqing University of Technology：Natural Science
基金
国家自然科学基金项目(51405356)
中央高校基本科研业务费专项(2018IVA061)。
关键词
除尘进气口
联合仿真
数值模拟
气动噪声
多孔降噪
dust removal air inlet
co-simulation
numerical simulation
aerodynamic noise
porous noise reduction
