Research Article
Measurement of Annular Flow for Drilling Engineering by Electromagnetic Flowmeter Based on Double-Frequency Excitation
Table 1
Data statistics of the principle prototype.
| | Verification flow point (transducer frequency Hz) | Transient flow of standard meter (m3/h) | Transient flow of detected principle prototype (m3/h) | Flow difference (m3/h) | Relative value error of each verification of each flow point (%) | Maximum absolute value of the relative error of every single verification of each flow point (%) | Relative display value errors of verification points (%) | Repeatability (%) |
| | 30 | 90.194 | 90.222 | 0.028 | 0.031 | 0.52 | 0.06 | 0.331 | | 90.133 | 90.083 | -0.050 | -0.055 | | 90.223 | 90.688 | 0.465 | 0.515 | | 90.465 | 90.222 | -0.243 | -0.269 |
| | 22.5 | 67.403 | 67.988 | 0.585 | 0.868 | 0.87 | 0.39 | 0.369 | | 67.857 | 68.081 | 0.224 | 0.330 | | 67.429 | 67.689 | 0.260 | 0.386 | | 67.963 | 67.943 | -0.020 | -0.029 |
| | 15 | 44.420 | 44.516 | 0.096 | 0.216 | 0.52 | -0.16 | 0.407 | | 44.703 | 44.480 | -0.223 | -0.499 | | 44.605 | 44.374 | -0.231 | -0.518 | | 44.509 | 44.587 | 0.078 | 0.175 |
| | 7.5 | 19.998 | 19.832 | -0.166 | -0.830 | 0.90 | -0.36 | 0.756 | | 20.496 | 20.312 | -0.184 | -0.898 | | 19.627 | 19.771 | 0.144 | 0.734 | | 20.509 | 20.418 | -0.091 | -0.444 |
| | 3.65 | 9.018 | 9.027 | 0.009 | 0.100 | 0.68 | -0.16 | 0.624 | | 8.973 | 9.027 | -0.054 | 0.602 | | 8.967 | 8.908 | -0.059 | -0.658 | | 8.963 | 8.902 | -0.061 | -0.681 |
| | 3 | 7.354 | 7.539 | 0.185 | 2.516 | 2.75 | -0.32 | 2.396 | | 7.350 | 7.218 | -0.132 | -1.796 | | 7.264 | 7.317 | 0.053 | 0.730 | | 7.562 | 7.354 | -0.208 | -2.751 |
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