Method and device for bi-directional low-velocity flow measurement

摘要

A precision flowmeter is adapted to measure at least one of mass flow rate and flow velocity of a fluid, at steady or transient state, in a bi-directional low-velocity flow system. The flowmeter includes pressure taps and static pressure taps, passing from the interior of a tubular main body and through a wall of the tubular main body, and a plurality of impact tubes located circumferentially spaced-apart and extending axially parallel through a conical wall of the tubular main body toward a center of the cylindrical throat portion. The pressure taps correspond in number to the plurality of impact tubes and communicate with inner ends of the corresponding plurality of impact tubes, and static pressure taps pass through walls of the upstream and downstream tubular channel sections and through the tubular throat portion. A method for measuring at least one of flow rate and flow velocity of a fluid is also disclosed.