What are the considerations regarding the diameter and flow range of vortex flowmeters, their measurement accuracy, as well as the choices for installation?
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In fact, Karman vortex streets are not all responsible for unfortunate accidents; they also have many successful applications. For example, the Karman vortex street flow meter, which is widely used in industry, is a type of flow meter that utilizes the Karman vortex street phenomenon. When the vortex generator is inserted vertically into the fluid, a Karman vortex street is formed as the fluid flows around the generator. Under certain conditions, this asymmetric vortex row can remain stable. At this time, the frequency f of the vortices is related to the flow velocity v of the fluid and the width d of the vortex generator by the formula: f = St(v/d), where St is the Strouhal number, which remains constant under normal operating conditions. As the title suggests: the diameter and flow range of vortex flow meters, their measurement accuracy, the considerations involved in their selection and installation, and the relationship between the flow range and the Reynolds number
We provide the parameters to the manufacturer, who then calculates the diameter; installation should take place away from sources of interference (such as electromagnetic interference and vibrations).
Conveyance pipes are usually either large or small, but the aperture of the flow meter should be as small as possible; if necessary, the diameter can be adjusted, otherwise low-flow rates cannot be measured.
Specific requirements are stipulated in Clause 7.4.2 of SH/T 3005-2016 and Clauses 6.4.1~6.4.3 of HG/T 20507-2014.