FLANGED REDUCER VORTEX FLOWMETER

摘要

A flanged vortex flowmeter is connected to a flanged piping system that has a diameter larger than the diameter of the measurement section of the vortex flowmeter border. The vortex flowmeter has an inlet flange that reduces diameter from the inlet to the measurement section. A bluff body positioned in the measurement section produces vortices that alternate at a frequency proportional to the flow rate of fluid through the flowmeter. A length from inception of vortex shedding at the bluff body to a first expansion of the flow passage downstream of the bluff body is greater than a vortex wavelength of the vortices produced by the bluff body.

主权项

1. A vortex flowmeter comprising:
a flow tube body having a flow passage extending between an upstream end and a downstream end, the flow passage having a measurement section of a diameter DM and a reducer section between the upstream end and the measurement section in which the diameter reduces from a larger diameter DP at the upstream end to the diameter DM of the measurement section; and a bluff body positioned in the measurement section to produce vortices that alternate at a frequency related to flow rate of fluid through the flow passage; wherein a length LM from a location of inception of vortex shedding at the bluff body to a first expansion in diameter of the flow passage downstream of the bluff body is greater than a vortex wavelength λ of the vortices produced by the bluff body.