| 摘要 |
<p>A device for measuring the volume flow of a fluid in a pipe comprises at least two objects to be arranged in the pipe. By means of sensors, the frequencies can be determined with which vortices occur which arise behind the respective objects upon the fluid flowing round the objects. The objects are of so different a shape and/or diameter that at least one of the vortex frequencies thereby determined is independent of a pulsation frequency possibly arising in the approach velocity of the fluid. A sensor is present for determining this pulsation frequency, while further means are present for determining the approach velocity from that vortex frequency or those vortex frequencies for which it holds that the ratio between the vortex frequency and the pulsation frequency lies outside an interval (0.4, 2.5).</p> |
