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Improving the estimation of methodological errors in reproducing the volumetric air flow rate by reference critical nozzle
https://doi.org/10.32446/0132-4713.2021-1-4-30
Abstract
In the development of the previously obtained results a more accurate estimate of the methodological error in reproducing the volumetric air flow rate by reference critical nozzle is given, associated with the choice of the gas flow model and due to taking into account the initial kinetic energy of the flow at the nozzle inlet. Based on improved flow model an analytical evaluation of the methodological error in reproducing the volumetric air flow rate by reference critical nozzle, which is due to a change in the humidity of the working air, has been carried out. It is shown that the methodological error in reproducing the volumetric air flow rate by reference critical nozzle, associated with a change in the air humidity, as well as the analogies methodical error caused by the existence of the initial kinetic energy of the flow, must be taken part in accuracy characteristics at the real operating conditions of the standard volumetric air flow rate using critical nozzles.
About the Author
V. I. Chesnokov
Russian Research Institute for Metrological Service (VNIIMS)
Russian Federation
Russian Federation
Vladimir I. Chesnokov
Moscow
References
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Review
For citations:
Chesnokov V.I. Improving the estimation of methodological errors in reproducing the volumetric air flow rate by reference critical nozzle. Metrologiya. 2021;(1):4-30. (In Russ.) https://doi.org/10.32446/0132-4713.2021-1-4-30
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