单声道超声流量计不同声道布置形式的流场适应性  

Flow Adaptabilities of Single-Beam Ultrasonic Flowmeters with Different Acoustic Path Arrangements

作　　者：郑丹丹[1,2] 张朋勇[1,2] 张涛[1,2] 赵丹[1,2] 

机构地区：[1]天津市过程检测与控制重点实验室,天津300072 [2]天津大学电气与自动化工程学院,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2014年第8期703-710,共8页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金青年基金资助项目(61101227);天津市应用基础与前沿技术研究计划资助项目(13JCQNJC03300)

摘　　要：流量计安装条件对其测量性能的影响是流量测量领域的一个重要问题.基于实流实验与数值仿真相结合方法,对单声道超声流量计的5种声道布置形式进行研究,对其在3种典型的阻流件(单弯头、双弯头、渐缩管与单弯头组合)下游的测量性能进行数值仿真,提出了流场敏感误差和流场敏感因子2个评价指标来表征超声流量计的流场适应性.结果表明:三角形声道布置方式对这3种非理想流场均有较好的适应性;超声流量计对流场的敏感程度与其声道反射次数没有必然联系,关键是合理布置声道位置.Installation effects of flowmeters on their performances have been recognized as a major problem in flow measurements.Single-beam ultrasonic flowmeters with five different types of acoustic path arrangements were investigated based on experiments and numerical simulations in this paper.Measurement performances of these flowmeters downstream of three typical installation conditions,single elbow,double elbows and reducer and single elbow,were mainly numerical simulated and discussed.In order to compare flow adaptabilities of the five types of flowmeters for three non-ideal flow fields,two evaluation parameters were proposed：flow-sensitive error and flowsensitive factor.Results show that the best flow adaptability can be obtained from the triangle type of ultrasonic flowmeter under complex installation conditions.Besides,instead of increasing the number of sound path reflections,the key factor to improve the non-ideal flow adaptability of single-beam ultrasonic flowmeter is to arrange the acoustic path appropriately.

关 键 词：单声道超声流量计 数值仿真 声道布置 非理想流场 

分 类 号：TP212.9[自动化与计算机技术—检测技术与自动化装置]