1. China Jiliang University, Hangzhou, Zhejiang 310018, China
2. National Institute of Metrology, Beijing 100029, China
3. Hebei Normal University, Shijiazhuang, Hebei 050024, China
Abstract：The OpenFOAM numerical simulations, combined with the experimental measurements of the high-pressure pVTt gas flow standard device of the National Institute of Metrology, was conducted for the three sonic nozzles with throat diameters of 0.32mm, 1.01mm and 3.20mm. The effect of flow state and metrological characteristics resulted from gas media were quantitively investigated within the laminar flow range of 4.14×103～8.21×105 throat Reynolds number. The results show that the difference of discharge coefficients between hydrogen and helium is within 1.14%, while the difference of discharge coefficients between hydrogen and air is within 0.45%.
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2024, Vol. 45 
