| 摘要 |
A cylindrical body having a curved nose at one end and a flat base at the other end is connected to a disc of smaller diameter, with the disc being centered coincident with the longitudinal axis of the body and being spaced axially from the base thereof. This assembly, when aligned axially at midstream of a flowing fluid with the nose pointed upstream, generates a downstream wake in which the fluid traces an unsteady, irregular flow pattern, oscillatory in nature but with random, unpredictable variations and extinctions in the amplitude and frequency thereof. Modification of the assembly by an additional element of structure which splits or obstructs the fluid flow at or downstream from the space between the base and disc stabilizes the wake flow pattern into a fixed plane of strong oscillations the amplitude and frequency of which are readily measured. The frequency of the stabilized oscillations varies directly with the volumetric velocity of the fluid flow over a considerable range of velocities, whereby the modified assembly constitutes a simpler, linear, no-moving parts, digital-output flowmeter by which the fluid flow velocity can be readily measured with high precision.
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