Vortex-shedding flowmeter and method of measuring fluid flow

摘要

A vortex-shedding flowmeter comprising two stationary vortex-shedding cross-members (11,12) (i.e., bluff bodies) disposed transversely to a stream of fluid. Each cross-member (11,12) has a bluff face (14,16) with sharp Karman vortex generating edges (15a, 15b; 17a, 17b) with independently selected edge to edge widths (d) of from 10 to 40 % of the sinside width of the conduit (10) through which the fluid flows and lengths (L) of from 0.3 to 2.0 d. The second cross-member (12) is disposed downstream of the first cross-member. Any sensor may be used in any location provided it or they sense the Karman vortices generated by co-action of the two cross-members (11,12). This flowmeter provides strong signals with a high signal to noise ratio and high Strouhal number.