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Title: Owards The Improvement Of A Blow - Down Type High Pressure Air Flow Calibration Rig
Author: Wen- Bin Wang Fong-Ruey Yang Bodo Mickan Chun-Min Su
Source: Flomeko 2016
Year Published: 2016
Abstract: A blow - down type high pressure air flow calibration rig has been established at Center for Measurement Standards (CMS) in Taiwan since 1996. The facility consists of a primary standard which adopts the gravimetric method and a secondary standard which utilizes master meter method using sonic nozzles, having a capacity of flow from 15 m 3 /h t o 12000 m 3 /h under standard condition and pressure from 1 bar to 60 bar. During flowmeter calibration, the air pressure in the upstream storage tank drops continuously due to the blow - down design, leading to the corresponding temperature drop. Measures hav e been taken to improve the facilitys performance and reduce the thermal effect during flow meter calibration. T he original sonic nozzle bank was replaced by a new sonic nozzle array consisting of seven nozzles which can be operated independently. The thro at diameters of the new nozzles range from 2.312 mm to 11.56 mm, having nominal flow rates of 3 m 3 /h to 75 m 3 /h, and the three largest nozzles have to be operated simultaneously to achieve the maximum flow rate. Two additional sonic nozzles were installed downstream of the nozzle array as the check meters

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