炉管内壁结焦流致噪声声场特性的数值模拟  

Numerical simulation of acoustic field characteristics of flow-induced noise by coking on the inner wall of furnace tubes

作　　者：张颖 缪钰 张盛瑀 周发戚 ZHANG Ying;MIAO Yu;ZHANG Shengyu;ZHOU Faqi(School of Safety Science and Engineering,Changzhou University,Changzhou 213164,Jiangsu,China;PetroChina Daqing Refining and Chemical Company,Daqing 163000,Heilongjiang,China)

机构地区：[1]常州大学安全科学与工程学院,江苏常州213164 [2]中国石油天然气股份有限公司大庆炼化公司,黑龙江大庆163000

出　　处：《安全与环境学报》2024年第4期1396-1403,共8页Journal of Safety and Environment

基　　金：中国石油天然气股份有限公司—常州大学创新联合体科技合作项目(KYZ22020129);江苏省研究生实践创新计划项目(SJCX221379)。

摘　　要：炉管内壁结焦是管式反应器长期安全运行的重要影响因素。由于炉管内壁结焦会诱发异常流动噪声,因此可采用声学方法检测炉管内壁结焦状态。以含焦块区域的炉管为研究对象,基于大涡模拟和广义莱特希尔方程对结焦初期的炉管进行二维数值计算,并对计算得到的焦块附近噪声分布特性进行研究。结果显示:炉管内壁结焦时,由于湍流应力作用,焦块后方会出现明显的流动噪声场,且声场强度随距离逐渐减弱。此外,研究模拟分析了不同高度和不同迎角焦块对流致噪声的影响,发现随着焦块高度从2 mm增加到8 mm,总声压级增加35 dB。研究工作可为炉管内壁结焦状态的声学检测提供指导。This study focuses on pipelines containing the initial coke block area,and the influence of coke parameters on the sound field distribution is mainly discussed.A two-dimensional calculation model of the pipeline is developed to investigate the part of the flow field and sound field of the pipeline containing the coke block.Based on large eddy simulation and generalized Lighthill equation by using Fluent software and Actran acoustic software.The instantaneous data of the flow field calculated by Fluent software is imported into Actran acoustic software to complete the sound field calculation,and the noise distribution characteristics obtained by calculation were studied.The results show that when there is no coke block attached to the inner wall of the pipe,the flow field pressure in the pipe is evenly distributed.There is no volume sound source distribution in the sound field,and the sound pressure level has no obvious change.When the inner wall of the pipeline is coking,there is flow noise,and its sound pressure level changes obviously with the pressure pulsation.As the Angle of attack of the coke block increases from 90°to 120°,the total sound pressure level does not change obviously.As the height of the coke block increases from 2 mm to 8 mm,the total sound pressure level increases.The maximum sound pressure level area appears behind and above the coke block when the height is 8 mm and the angle of attack is 120°.When the coke block is attached to the pipeline,the pressure pulsation amplitude is stable,and the sound pressure level in the pipeline changes gently when the fluid does not pass through the coke block.After the fluid flows through the coke,the sound pressure level behind the coke block is higher than that in front because the turbulent stress behind the coke block is greater than that in front.As the fluid progresses,the backflow area behind the coke block attaches to the pipeline wall,resulting in an initial increase and subsequent decrease in the sound pressure level from the inlet to the outle

关 键 词：安全工程 流致噪声 声场模拟 声场分布 

分 类 号：X937[环境科学与工程—安全科学]