摘要
基于CFD软件对超声波水表内的流动进行流场分析,设计出一款能够降低压损、提高计量精度的水表抗扰流内芯结构。与目前普通水表内芯对比压损△P、阀门扰流工况下测量段速度标准差Eu-std及相对示值误差E并进行实验验证。实验结果表明,在水表常用流量点下,与普通内芯相比,安装抗扰流内芯的水表压损△P可降低10 kPa以上,阀门扰流工况下的最大相对示值误差E_(max)可降低1.7%。此外,文章还考察了抗扰流内芯导流柱长度c/D=0.3~1.25、尾端长度e/D=0~0.75对△P及E_(u-std)的影响,结果表明,研究范围内,当c/D=0.7、e/D=0.4时综合表现效果良好,压损为41 kPa,安装阀门后最大相对示值误差E_(max)为2.1%。
Based on flow field analysis on ultrasonic wave flow in water meter by using CFD software,antidisturbance inner core structure that can lower pressure loss and improve measuring precision is designed.Compared with current ordinary water meter inner core,pressure loss△P,measuring section speed standard deviation E_(u-std)under disturbance working condition and valve relative indication error E,and experimental verification are carried out.The experiment result shows that,under common flow point of water meter,compared with ordinary inner core,when the water meter is installed anti-disturbance inner core,its△P can reduce more than 10 kPa.Valve relative indication error E under maximum disturbance working condition can reduce 1.7%.Furthermore,this articles also researches diversion column length of anti-disturbance inner core,c/D=0.3-1.25,back length e/D=0-0.75 and its influence on△P and E_(u-std).The result shows that,within the research scope,when c/D=0.7,e/D=0.4,the comprehensive performance effect is good,pressure loss is 41 kPa,and after installing valve the maximum relative indication error E_(max)is 2.1%.
作者
冯建科
张元
刘正刚
于明
FENG Jianke;ZHANG Yuan;LIU Zhenggang;YU Ming(Qingdao iTechene Technologies Co.,Ltd.,Qingdao 266100,China;School of Energy and Power Engineering,Shandong University,Jinan 250061,China)
出处
《中国测试》
CAS
北大核心
2023年第9期139-145,共7页
China Measurement & Test
关键词
超声波水表
抗扰流内芯
数值计算
速度标准差
压损
ultrasonic flowmeter
anti-destabilizaition flow inner core
numerical calculation
speed standard deviation
pressure loss
