声波导管在声波测速中的应用  

Application of Acoustic Waveguide in Acoustic Velocity Measurement

作　　者：刘文平 周宾[1] 刘奇 LIU Wenping;ZHOU Bin;LIU Qi(School of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《电声技术》2022年第5期75-81,共7页Audio Engineering

基　　金：国家重点研发计划项目“光散射颗粒物浓度检测反演算法研究及测量装置研制”(No.2017YFB0603204);国家自然科学基金“气固两相撞击流撞击特性及其强化传热传质机理研究”(No.50976024),国家自然科学基金“高速调焦荧光光谱层析成像法重建微流动三维温度速度场”(No.50906013)。

摘　　要：声波测速技术应用于燃煤电厂烟气流速测量时,需要利用声波导管的过渡作用减弱高温烟气对声波传感器的损害,保证传感器的使用寿命。但是声波导管的多径效应会造成信号的衰减和失真,使测量结果存在较大误差而失准。对此,基于管道声学的原理对8种声波导管进行研究,通过理论分析和多工况测量实验,对声波导管的尺寸进行合理化选择,在此基础上搭建声波测速实验系统。实验结果表明,寻优后的声波导管的测速结果更准确,最佳尺寸的声波导管的测速相对误差的波动区间由5.70%~12.16%降为0.12%~3.67%。因此,可采用最佳尺寸的声波导管用于燃煤电厂的烟气流速测量。While the acoustic velocity measurement technology is applied to the measurement of flue gas velocity in coal-fired power plants, it is necessary to use acoustic waveguide to reduce the damage of high temperature flue gas to the sensor. However, the multipath effect of acoustic waveguide will lead to signal attenuation and distortion, resulting in the misalignment of measurement results.Based on the theoretical basis of pipe acoustic, 8 kinds of acoustic waveguides are tested. Through theoretical analysis and multicondition measurement experiments, the rational selection of the size of acoustic waveguides is made, then an experimental system of acoustic velocity measurement is built. The experimental results show that the results of the optimized acoustic wave guide are more accurate. The fluctuation range of the relative error of the optimal acoustic waveguide decreases from 5.70%~12.16% to 0.12%~3.67%.Therefore, the best size acoustic waveguide can be used to measure flue gas velocity in coal-fired power plants.

关 键 词：声波测速 声波导管 管道声学 烟气流速 

分 类 号：TK313[动力工程及工程热物理—热能工程]