Abstract: A vortex fluid meter (1) includes a pipe portion (2) of constant inside diameter in which the fluid flows, at least two obstacles disposed in the middle of the flow of the fluid in said pipe portion (2) each having a generally elongate shape with longitudinal and transverse dimensions perpendicular to the direction of flow of the fluid, and adapted to generate oscillatory fluid vortices, an upstream obstacle (4) having a substantially uniform trapezoidal transverse section and a downstream obstacle (6) having a generally T-shape transverse section, and means (10, 12, 14) for detecting the signal corresponding to the oscillations of said vortices and for deducing therefrom the fluid volume or flowrate.

Abstract: A vortex fluid meter (1) includes a pipe (2) having a maximum inside diameter D in which the fluid flows and having an internal profile comprising from the upstream end to the downstream end: a first pipe portion (4) progressively reducing the inside diameter of said pipe to a value D1 and having an inside wall (4a, 4b, 4c, 4d) at a continuously varying angle to the general direction of flow of the fluid; a second pipe portion (6) of constant diameter D1 in which is disposed at least one obstacle (8) adapted to generate oscillating fluid vortices; and a third pipe portion (20) returning the inside diameter of the pipe (2) to its original value D and adapted to separate the boundary layer of the fluid flow at a downstream end (6a) of said second pipe portion (6), and means (10, 12, 14, 16, 18, 200-221) for detecting the signal corresponding to the oscillations of the vortices and deducing the volume of fluid therefrom.