Influence of the Variable Geometry of the Diverter Nozzle on the Metrological Characteristics of a Calibration Unit with Weighing Devices |
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| A. A. Korneev, A V. Shchelchkov, R. A. Korneev |
- Abstract:
- The rationale for the expediency of using a diverter with a variable geometry of the nozzle exit in a calibration unit with weighing devices (hereinafter – Unit) is presented for the first time in this paper. The design, operating principle and timing diagram of a diverter with a variable geometry of the nozzle exit are described in this. The local hydrodynamic characteristics of the water flow in the nozzle exit of the diverter are made by a Pitot probe. The cut-off width of the diverter nozzle was changed at fixed values of the water flow rate. The metrological characteristics of the Unit are determined by the comparison method using a comparison standard. The effect of the width of the nozzle cut on the metrological characteristics of the Unit in the investigated range of the liquid flow rate has been established. The graphical dependencies of type τ = f(U(Qm ))and Qm=f (U (Qm )) of the expanded measurement uncertainty of the Unit when reproducing the unit of the mass flow rate of the liquid on the time interval of measurements and on the mass flow rate of the liquid are presented (k = 2, P = 0.95). Based on the research results, the optimal values of the nozzle exit width andmeasurement time intervals were determined depending on the values of the mass flow rate of the liquid when using a diverter with a variable geometry of the nozzle exit. Expansion of the range of operation of weighing devices included in Unit is justified.
- Keywords:
- Diverter; A variable geometry of the nozzle exit; Expanded measurement uncertainty
- Download:
- IMEKO-TC9-2019-003.pdf
- DOI:
- 10.21014/tc9-2022.003
- Event details
- IMEKO TC:
- TC9
- Event name:
- FLOMEKO 2022
- Title:
19th International Flow Measurement Conference 2022
- Place:
- Chongqing, CHINA
- Time:
- 01 November 2022 - 04 November 2022