摘要
水大流量标准装置是开展大口径流量仪表测试、确保大流量量值溯源与传递准确可靠的核心设备,换向器是影响其测量结果准确性与可靠性最关键的部件。针对现有水大流量装置存在稳定性难以保证、换向误差较大、被检仪表尺寸适应性差以及测试效率较低等诸多局限,设计并研制了一套高准确度、高流速大口径水流量标准装置及新型换向系统,装置集静态质量法、容积法和标准表法3种原理于一身,其最大测试管径为DN1000、最大运行流量10000 m^(3)/h、局部最高流速可达10 m/s,整体不确定度优于0.2%(k=2);分析了静态质量法水装置换向过程中液体流量的变化特征,建立了换向流量误差与计时误差关系模型,据此开展了对新型单向换向器的不确定度评价实验测试,结果表明,计时不确定度优于8.83×10^(-6)、测量时间总不确定度优于9.24×10^(-6),量级均十分微小,该换向装置性能出色。
The large water flow standard facility is the core device for carrying out large pipe diameter flow meter test and ensuring the accuracy and reliability of traceability and transmission of large water flow value,and the diverter is the most important component which affects the accuracy and reliability of the measurement results.Aiming at the limitations of the existing facilities for large water flow,such as difficult stability assurance,large reversing error,poor dimensional adaptability of the tested instrument and low test efficiency,a set of large diameter water flow standard facility with high accuracy,high velocity and a new reversing system were designed and developed.The facility has three principles of static mass method,volume method and standard meter method at the same time,and the maximum test pipe diameter is DN1000,the maximum operating flow rate is 10000 m^(3)/h,the local maximum flow velocity can reach 10 m/s,the overall uncertainty is better than 0.2%(k=2).The law of liquid quality change during the reversing process in the static mass method large flow standard facility was analyzed,and the relation model between reverse flow error and timing error is established,and finally the uncertainty evaluation test of this new type of diverter was carried out,the results show that the timing uncertainty is better than 8.83×10^(-6) and the total uncertainty of measurement time is better than 9.24×10^(-6),and the magnitude is very small,so the performance of the diverter is excellent.
作者
钱碧波
万勇
吴波
谢代梁
Qian Bibo;Wan Yong;Wu Bo;Xie Dailiang(Guangzhou Institute of Energy Testing,Guangzhou 511447,China;National Institute of Metrology,Beijing 100029,China;Key Laboratory of Flow Measurement Technology of Zhejiang Province,China Jiliang University,Hangzhou 310018,China)
出处
《电子测量与仪器学报》
CSCD
北大核心
2021年第11期47-53,共7页
Journal of Electronic Measurement and Instrumentation
基金
国家重点研发计划(2019YFB2006601)项目资助。
关键词
水大流量标准装置
新型换向系统
换向误差模型
性能评价
不确定度评定
large water flow standard facility
new reversing system
reversal error model
performance evaluation
uncertainty assessment
