Rotor operation in a vortex chamber flowmeter

A vortex chamber flowmeter comprising housing means having an inlet communicating with a first chamber, a jet ring positioned in said chamber and mounted in a fixed spatial relationship to said housing, said jet ring comprising an internal operating chamber surrounding an axis and having a centerline at an axial midpoint of the internal operating chamber and extending in a radial direction, a bearingless rotor positioned in the internal operating chamber for rotation about the axis, the internal operating chamber having an outlet at an axial end thereof, inlet conduits formed in said jet ring providing fluid communication between the first chamber and the internal operating chamber in a radial direction and providing for tangential fluid flow within the internal operating chamber, said conduits having ports with centerlines defining an effective plane, said flow meter being constructed such that the intersection of said axis with said plane is axially displaced from the intersection of said axis with said internal operating chamber centerline in an axial direction away from the outlet a distance of 1 1/2% to 18% of the axial dimension of the internal operating chamber, whereby stability of said rotor is improved.