NUMERICAL ANALYSYS OF THE INFLUENCE OF ASYMMETRIC DEFORMATION OF THE VELOCITY FIELD ON METROLOGICAL PROPERTIES OF THE ORIFICE
Journal Title: Metrology and Measurement Systems - Year 2005, Vol 12, Issue 2
Abstract
A change of the stream direction during a flow through a single elbow or their system causes asymmetric deformation of the velocity field. If two elbows are located in various planes, also a stream swirl can occur. The influence of these two phenomena on the accuracy of measurement of the fluid stream with orifices has been so far determined experimentally. In this paper theoretical considerations have been applied. Fluid motion has been described by the Reynolds set of equations closed with the k-ε model of turbulence. The three-dimensional set of equations has been solved for a fluid flow through the straight pipeline in the flow system with one or two elbows located in various planes. The tests were performed in order to estimate the influence of the velocity field upstream the orifice on the pressure distribution on the wall and the discharge coefficient for different distances of local obstacles from the orifice. The calculation results have been compared with the available experimental results.
Authors and Affiliations
BOLESŁAW DOBROWOLSKI, KRZYSZTOF KRĘCISZ
Keywords
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