摘要
对大管径多声道超声流量计在单弯管下游流场中的安装和测量性能进行了数值仿真研究,分析了超声流量计在0.1 m、1 m和10 m口径下不同流速、声道数、旋转角以及前直管段长度时测量误差的变化规律。仿真结果表明,交叉声道布置形式对弯管产生的二次流所引入的横向测量误差有很好地抑制作用;对于大口径弯管下游流量测量,采用交叉4声道且将超声流量计安装在弯管下游5D位置可以获得1%的精度,且随着声道数的增多测量误差有减小的趋势;相同雷诺数时的测量误差基本相同。研究结果可为大管径多声道超声流量计的实际安装和使用提供一定的参考。
Numerical simulation was carried out to study the installation and performance measurement of muhipath ultrasonic flowmeter with large diameter in single bend flow. Three pipes with diameter of 0.1 m, 1 m and 10 m and with different path number, configurations and upstream pipe length and in various velocities are discussed. Simulation results indicate that the paths formed in cross-section planes are insensitive to the secondary flow caused by sin- gle bend, which can obtain better measurement accuracy. For large pipes, 1% measurement error can be achieved when using ultrasonic flowmeter with 4 paths in each cross-section planes installed in 5 D downstream of single bend. As the number of paths increases better measurement precision can be obtained. Moreover, it is shown that different flow conditions with same Reynolds number have equal measurement error. All the research results provide references for the engineering applications of large muhipath ultrasonic flowmeters.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2010年第7期1601-1607,共7页
Chinese Journal of Scientific Instrument
关键词
多声道超声流量计
数值仿真
单弯管
测量误差
multipath ultrasonic flowmeter
numerical simulation
single bend pipe
measurement error
作者简介
郑丹丹，2004年于天津大学获得学士学位，2006年于天津大学获得硕士学位，2009年于天津大学获得博士学位，现为天津大学电气与自动化工程学院讲师，主要研究方向为过程参数检测。E-mail：zhengdandan@tju．edu．cn张朋勇，2009年于河南大学获得学士学位，现为天津大学电气与自动化学院硕士研究生，主要研究方向为超声流量计数值仿真。E—mail：zhangpengyong01@163．com
