Research of spatial hydrodinamic effects in the meterbody of the vortex flowmeter

The article investigates the three-dimensional hydrodynamic effects produced by variations of geometrical shape of the shedder bar, in particular a variable cross-sectional shape along the length of shedder. Actuality is due to lack of special information at this time. Modern sources of information on the study of three-dimensional hydrodynamic effects in the flow part of the vortex flowmeter and other similar devices were investigated. A brief description of the process of vortex behind a shedder bar located in a pipe-line of circular cross section given in this article. The research has been performed for the influence of geometry of the variable cross section shedder bar located in the meter body of a vortex flowmeter, on three-dimensional structure of turbulent flow near shedder bar and the downstream sensor. Flowing part was simulated in the software package ANSYS in the CFX module for liquid and gas. In addition to numerical calculations physical experiments on liquid and gas stands located at “Industrial group “METRAN” were performed. The variation of the working characteristics of the dimensionless Strouhal number on the Reynolds number Sh(Re), caused by deviations of shedder bar geometrical parameters, in particular a variable cross-sectional shape along the length of shedder, calculated from the straight shape was investigated. To do this were made and tested samples with geometry deviations and their associated numerical models. By results of the research, it was found that shedder bar with variable cross section along the length of bluff body in contradistinction from the straight design creates a gap continuous vortex at a certain point. As a result, a change in the spatial structure of the vortex flow and the amplitude-frequency characteristic occurs affecting the performance of the vortex flowmeter.