Abstract：For the application of combined total pressure pipe in flow measurement of large pipeline with diameter more than 1m, numerical simulation was carried out on the combination total pressure tube with different hole extraction methods (isocyclic method, Chebyshev method) and different amount of total pressure holes (2 pairs, 3 pairs and 4 pairs). The results indicate that the relative error of the measured results of the combination total pressure tube with 4 pairs of holes arranged by the Chebyshev method is small, which has the best effect. The combination total pressure tube was made according to the best hole-taking method,and the flow measurement test was carried out. The measurement results were compared with those obtained by the transverse method of Pitot static pressure tube. The results show that the deviation of two flow measurement methods is within±0.5%.
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2022, Vol. 43 
