基于流速面积法的明渠流量测量不确定度评定

doi:10.3969/j.issn.1000-1158.2015.05.17

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摘要针对ISO 748进行明渠流量测量不确定度评定,需在测量断面上设置充足的垂线数和测点,且没有考虑底层、表层和两边壁盲区流速插补引入的不确定度问题,提出了一种新型明渠流量测量不确定度评定方法。通过Fluent数值模拟,得出明渠断面垂线流速分布模型和横向平均流速分布模型。在实验测量中,根据两者流速模型分别计算出断面垂线测点不足和垂线数不足引入的不确定度,对明渠流量测量的不确定度进行了评定。结果表明,该方法提高了明渠流量测量不确定度评定的准确性。

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	赵伟国
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关键词 ：计量学, 流量测量, 明渠, 数值模拟, 不确定度, 流速分布模型

Abstract：According to the ISO 748, when the uncertainty of open channel discharge measurement was evaluated, the sufficient measurements and verticals need be set in the crosssection, but velocity interpolation to the edge and in the top/bottom layers are not taken into account. In order to solve the problems, a new approach is introduced for evaluating the uncertainty. The vertical velocity and transversal mean velocity distribution model of crosssection were achieved with FLUENT. In the experiment, the uncertainty caused by limited number of velocity measurements points and measurement verticals were computed with the velocity distribution models respectively. The uncertainty components are analyzed to calculate the uncertainty of discharge measurements. The experiment results showed that the method improves the accuracy of the measurement uncertainty.

Key words： metrology flow measurement openchannel numerical simulation uncertainty velocity distribution model

基金资助:浙江省重点科技团队创新项目(2011R09024)

作者简介: 赵伟国（1973-）,男,陕西蓝田人,中国计量学院副教授,主要从事流量检测与智能仪表方面的研究。zjufriendly@163.com

引用本文:

赵伟国,王成李,朱炜,戴连超. 基于流速面积法的明渠流量测量不确定度评定[J]. 计量学报, 2015, 36(5): 526-529.
ZHAO Wei-guo,WANG Cheng-li,ZHU Wei,DAI Liang-chao. Uncertainty Evaluation of Open channel Discharges Measurement with the Velocity area Method. Acta Metrologica Sinica, 2015, 36(5): 526-529.

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http://jlxb.china-csm.org:81/Jwk_jlxb/CN/10.3969/j.issn.1000-1158.2015.05.17 或 http://jlxb.china-csm.org:81/Jwk_jlxb/CN/Y2015/V36/I5/526