KARMAN VORTEX STREET FLOWMETER

摘要

A Kármán's vortex street current meter has a conduit having a vortex generating strut extending horizontally thereacross substantially perpendicular to the direction of flow of a stream of fluid through the conduit; a part upstream of the strut in which convection can take place for causing the less dense portion of the fluid flowing in the conduit to rise and flow along the upper part of the conduit and the more dense portion to flow along the lower part of the conduit; and a vortex detector downstream of the strut and including an ultrasonic transmitter at the upper part of the conduit for propagating an ultrasonic wave across the Kármán's vortex street generated downstream of the generating strut, and an ultrasonic receiver positioned oppositely to the transmitter on the lower side of the conduit.