| 摘要 |
A vortex flowmeter (1) including a fluid flow duct (2) having a maximum internal diameter (D) and consisting of an inner profile section with, in the downstream direction, a first portion (4) gradually reducing the internal diameter of the duct to a value (D1) and having an inner wall (4a, 4b, 4c, 4d) at a continuously variable angle to the general fluid flow direction, a second portion (6) having a constant diameter (D1) and containing at least one obstruction (8) for generating oscillating fluid vortices, and a third duct portion (20) in which the internal diameter of said duct (2) returns to its starting value (D), and which causes fluid flow boundary layer separation at a downstream end (6a) of said second duct portion (6); as well as an assembly (10, 12, 14, 16, 18, 200-221) for sensing a vortex oscillation signal and deducing the fluid volume or flow rate therefrom.
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