基于声学法的送风机风速测量实验研究  

Experimental Research on Wind Speed Measurement of Blower Based on Acoustic Method

作　　者：蔡伟 刘奇 周宾[2] 任瑞华 李杰 CAI Wei;LIU Qi;ZHOU Bin;REN Rui-hua;LI Jie(Huaneng Shandong Power Generation Co.,Ltd.Yantai Power Plant,Yantai 264000,China;School of Energy and Environment,Southeast University,Nanjing 210096,China;Shandong Shengzhuo Information Technology Co.,Ltd.,Jinan 250101,China)

机构地区：[1]华能山东发电有限公司烟台发电厂,山东烟台264000 [2]东南大学能源与环境学院,江苏南京210096 [3]山东晟卓信息技术有限公司,山东济南250101

出　　处：《仪表技术与传感器》2021年第6期100-103,114,共5页Instrument Technique and Sensor

摘　　要：在不影响送风机管道流场的前提下,基于声学法对送风机风速进行了实验测量。实验采用线性扫频电声源信号,扬声器和传声器分别交叉布置在流道两侧,并与流动方向成一定角度。通过对背景噪声分析,高温环境下声音信号的仿真分析,确定了声源频率为4~8 kHz,通过互相关时延估计算法的仿真研究,采用PHAT加权的互相关算法对声信号进行分析计算,得到传播过程中的准确飞渡时间,从而得到烟气流速。结果表明:声学法能够准确对送风机管道风速进行计算,其测量误差小于5%,能够满足电厂监测需求。On the premise of not affecting the flow field of the blower duct,the wind speed of the blower was experimentally measured based on the acoustic method.The experiment used a linear frequency-swept electroacoustic source signal.The speakers and microphones were respectively arranged on both sides of the flow channel at an angle to the flow direction.Through the analysis of background noise and the simulation analysis of the sound signal in high temperature environment,the sound source frequency was determined to be 4~8 kHz.Through the simulation study of the cross-correlation delay estimation algorithm,the PHAT-weighted cross-correlation algorithm was used to analyze and calculate the sound signal.The accurate flight time was obtained in the propagation process,and thus getting the flue gas velocity.The results show that the acoustic method can accurately calculate the wind speed of the fan duct,and its measurement error is basically less than 5%,which can meet the monitoring needs of the power plant.

关 键 词：声学法测速 送风机风速 互相关算法 数值仿真 

分 类 号：TK313[动力工程及工程热物理—热能工程]