电站锅炉管阵列内声传播特性及时延值测量  

Acoustic Propagation and TDOA Measurement in Tube Arrays of Utility Boiler

作　　者：安连锁[1] 冯强[1] 沈国清[1] 姜根山[1] 张世平[1] 王鹏[1] 张海宇[2] 

机构地区：[1]华北电力大学能源动力与机械工程学院,电站设备状态监测与控制教育部重点实验室,北京102206 [2]中国城市建设研究院有限公司,北京100120

出　　处：《动力工程学报》2017年第1期13-20,共8页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(11274111);北京高等学校青年英才计划资助项目(YETP0700);华北电力大学中央高校基本科研业务费专项资金资助项目(2014MS10;2015XS77)

摘　　要：对电站锅炉管阵列内声传播特性及时延值进行研究,利用Fluent软件对非均匀温度场与均匀温度场、不同管排数及不同布置方式的管阵列内声传播特性进行对比,并搭建管阵列实验台,引入快速集合经验模态分解(EEMD)算法对管阵列内时延值进行测量.结果表明:管阵列内声传播存在声阻带,且在非均匀温度场集合经验模态分解下声阻带向低频段移动,管排数越多,声阻带效应越明显,管道间节距对错列与顺列布置方式下的声阻带有一定影响;基于快速EEMD处理,选用低频段声信号能够获得有效时延值.A study was conducted on acoustic propagation and TDOA measurement in tube arrays of utility boiler, where the propagation characteristics were numerically compared using Fluent software under the conditions of uniform/non-uniform temperature field, and different rows of tubes in different arrangements, while the TDOA in tube arrays was measured on a self-developed test bench by Fast EEMD algorithm. Results show that acoustic band gaps exist in the tube array, which move to low frequency area in non-uniform temperature field. With the rise of tube rows, the effect of acoustic band gap becomes more obvious. Tube pitch has a certain influence on the band rejection in both sequence and stagger arrangement of tubes. Based on Fast EEMD algorithm, effective TDOA can be obtained when low frequency signals are chosen.

关 键 词：电站锅炉 管阵列 声传播特性 时延值 快速集合经验模态分解 

分 类 号：TK39[动力工程及工程热物理—热能工程]