Uncertainty Estimation of Flowrate Measurement Using UVP

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  • WADA Sanehiro
    産業技術総合研究所 計量標準総合センター 工学計測標準研究部門
  • FURUICHI Noriyuki
    産業技術総合研究所 計量標準総合センター 工学計測標準研究部門
  • SHIMADA Takashi
    産業技術総合研究所 計量標準総合センター 工学計測標準研究部門

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Other Title
  • UVPによる流量計測の不確かさ評価研究
  • UVP ニ ヨル リュウリョウ ケイソク ノ フ タシカ サ ヒョウカ ケンキュウ

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Description

<p>We introduce the uncertainty estimation of flowrate measurement using ultrasonic Doppler velocity profiler (UVP). A fundamental uncertainty analysis for a flowrate measurement in a pipe using UVP and an evaluation of the estimated uncertainty by an actual flow calibration are described. The relative expanded uncertainty due to internal factors is estimated to be 0.34% with a coverage factor of 2. In addition, experiments are carried out in a disturbed flow. Flowrate measurement is based on a multi-path measurement using three ultrasonic transducers. To generate the disturbed flow, obstacle plates are installed upstream of the test section. The maximum difference from the reference flowrate given by the national standard calibration facility of water flowrate is over 2% when the measurement is performed at 8D downstream of the obstacle plate. At 25D downstream of the obstacle plate, the deviation is within the fundamental uncertainty level.</p>

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