Uncertainty analysis of the high pressure closed loop gas flow standard facility in NIM. (April 2021)

• Record Type: Journal Article
• Authors: Li, Chunhui; Wang, Chi; Cui, Lishui
• Is Part Of: Flow measurement and instrumentation. Volume 78(2021)
• Publication Date: 2021-04
• Subjects: Gas flow facility -- Turbine meter -- Uncertainty -- Calibration standard; Fluid dynamic measurements -- Periodicals; Flow meters -- Periodicals; Fluides, Dynamique des -- Mesure -- Périodiques; Débitmètres -- Périodiques; 681.2805
• DOI: 10.1016/j.flowmeasinst.2021.101891
• Languages: English
• ISSNs: 0955-5986

Abstract

Abstract: High pressure air flow standard facilities, including the pVTt facility, sonic nozzle facility and closed loop facility were built in NIM at the end of 2014. The high pressure closed loop gas flow facility was the first closed loop facility in China. The system has 4 sets of 100 mm diameter turbine meters for the reference meters with a flow range of (40–1300) m 3 /h and a pressure range of (190–2500) kPa. To avoid uncertainties introduced during installation, the reference meters were designed to be calibrated in situ using the sonic nozzle facility. The uncertainty in the pressure measurement was reduced by installing an absolute pressure transducer in the manifold upstream of the reference meters, with differential pressure transducers used to measure the pressure drops across the reference flow meter and the test flow meter. The relative expanded uncertainty for the test meter can reach 0.20% ( k = 2) as verified by comparison the sonic nozzle facility and the closed loop facility measurements. Highlights: A high pressure closed loop gas flow standard measurement facility was built. Reference meters were designed to be calibrated in situ with sonic nozzle facility. The expanded uncertainty for the test meter was less than 0.20% ( k = 2).