摘要
搭建了一套可变喉宽巴歇尔槽明渠流量计测量系统,并采用计算流体力学(CFD)建立巴歇尔槽明渠流量计的数值模型,利用理论分析、数值模拟方法和实验室实验结合的方式开展了巴歇尔槽明渠流量计喉宽尺寸偏差对流量测量误差影响的研究。研究结果表明:巴歇尔槽明渠流量计喉宽尺寸偏差对流量测量误差的影响为U型,理论计算上存在无误差点;在不同喉宽条件下,对比理论计算、CFD计算以及现场实验得到的液位值,可以发现3种方法的测量结果具有较高的一致性;通过标准流量装置的测试,液位高度与喉道宽度成反比,随着喉宽尺寸的变化,流量测量误差随之变化;当喉宽尺寸偏差在±0.8%范围内,其对流量测量误差的影响量小于0.8%,研究结果可为巴歇尔槽明渠流量计的生产、加工及使用提供参考。
A measurement system with a variable-throat Parshall flume is constructed in the laboratory,and a numerical model of the Parshall flume is developed using computational fluid dynamics(CFD).The influence of throat width errors on flow measurement accuracy is investigated through a combination of theoretical analysis,numerical simulations,and laboratory experiments.Key findings reveal:the relationship between throat width deviations and flow measurement errors exhibits a characteristic U-shaped pattern,theoretically containing a zero-error point;under different throat width conditions,a comparison of the liquid level values obtained from theoretical calculations,CFD calculations,and hydraulic tests reveals that the measurement results from the three methods are highly consistent;hydraulic tests using standardized flow facilities demonstrates an inverse proportionality between upstream head and throat dimension,with measurement errors amplifying as throat width variations increase;when throat width deviations remain within±0.8%,their impact amount to overall flow measurement error remains below 0.8%.These results provide critical technical references for precision manufacturing,quality control,and operational optimization of Parshall flumes in practical applications.
作者
张柯
裘雪玲
樊家成
ZHANG Ke;QIU Xueling;FAN Jiacheng(Henan Institute of Metrology,Zhengzhou,Henan 450000,China;National Quality Supervision and Inspection Center for Water Meter,Zhengzhou,Henan 450000,China;Jiangxi General Institute of Testing and Certification,Nanchang,Jiangxi 330000,China)
出处
《计量学报》
北大核心
2025年第8期1127-1133,共7页
Acta Metrologica Sinica
基金
2022年度江西省检验检测认证总院揭榜挂帅计划(ZYK202209)。
关键词
流量计量
巴歇尔槽明渠流量计
数值模拟
喉宽
尺寸偏差
测量误差
flow metrology
parshall flume
numerical simulations
hroat width
dimensional deviations
measurement error
