TY - JOUR
T1 - On measurement uncertainty of a vortex flowmeter
AU - Miau, J. J.
AU - Yeh, C. F.
AU - Hu, C. C.
AU - Chou, J. H.
N1 - Funding Information:
This work was supported by National Science Council, Taiwan, Republic of China, under the contract number NSC 91-2212-E-006-046.
PY - 2005/12
Y1 - 2005/12
N2 - The measurement uncertainty of a T-shaped vortex flowmeter was examined with a gas flow calibration facility, for Reynolds numbers, Red, in a range of 2.56 × 104-1.56 × 105. The total uncertainty interval of the Strouhal values deduced from a Fourier spectral analysis was ±0.745%, and the linearity of the data was ±1.78%. Meanwhile, a scheme based on pulse counting in reference to the analog signals measured gave the total uncertainty interval of the meter factor as ±0.568%, with the linearity ±1.89%. Further, the flowmeter was tested in a fully developed water pipe flow facility, for Red of 5.6 × 103-5.29 × 104. The vortex shedding frequencies were obtained with the techniques of Fourier transform and autocorrelation, respectively. At low flow rates, the autocorrelation technique gave a smaller uncertainty interval than the Fourier analysis did; at higher flow rates the situation was reversed. The linearity of the St values obtained in the water pipe flow experiment was ±0.391%, noticeably smaller than that obtained in the gas flow facility.
AB - The measurement uncertainty of a T-shaped vortex flowmeter was examined with a gas flow calibration facility, for Reynolds numbers, Red, in a range of 2.56 × 104-1.56 × 105. The total uncertainty interval of the Strouhal values deduced from a Fourier spectral analysis was ±0.745%, and the linearity of the data was ±1.78%. Meanwhile, a scheme based on pulse counting in reference to the analog signals measured gave the total uncertainty interval of the meter factor as ±0.568%, with the linearity ±1.89%. Further, the flowmeter was tested in a fully developed water pipe flow facility, for Red of 5.6 × 103-5.29 × 104. The vortex shedding frequencies were obtained with the techniques of Fourier transform and autocorrelation, respectively. At low flow rates, the autocorrelation technique gave a smaller uncertainty interval than the Fourier analysis did; at higher flow rates the situation was reversed. The linearity of the St values obtained in the water pipe flow experiment was ±0.391%, noticeably smaller than that obtained in the gas flow facility.
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U2 - 10.1016/j.flowmeasinst.2005.04.005
DO - 10.1016/j.flowmeasinst.2005.04.005
M3 - Article
AN - SCOPUS:26844571831
VL - 16
SP - 397
EP - 404
JO - Flow Measurement and Instrumentation
JF - Flow Measurement and Instrumentation
SN - 0955-5986
IS - 6
ER -