International Comparison of Pitot Tube for Nulling Method
YANG Mei-zhao1,2,3, ZHANG Liang2,3, FANG Li-de1, WANG Chi2,3
1. College of Quality and Technical Supervision, Hebei University, Baoding, Hebei 071002, China
2. National Institute of Metrology, Beijing 100029, China
3. Zhengzhou Institute of Metrology, Zhengzhou, Henan 450001, China
Abstract：In order to verify the consistency of the calibration coefficients of S-type pitot tube, spherical 3D pitot tube and prismatic 3D pitot tube used for on-site flue flow measurement, the National Institute of Metrology(NIM) led the calibration comparison of pitot tube with the participation of National Institute of Standards and Technology(NIST) and Korea Research Institute of Standards and Science(KRISS). The results showed that the consistence of S-type pitot tube in different laboratories was relatively poor, so it was not suitable to be used as a comparison standard instrument. The results of spherical 3D pitot tube in different laboratories were more consistent than that of prism 3D pitot tube, the influence of velocity calibration coefficient difference on axial velocity is higher than that of yaw angle reference position error and pitch angle calibration coefficient difference, the difference of axial velocity caused by the yaw angle reference position error and the difference of pitch angle calibration coefficient is 0.03%~0.9%, and the difference of axial velocity caused by the difference of velocity calibration coefficient is 1.9%~12.2%.
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2022, Vol. 43 
