Abstract: In order to improve the anti-jamming performance of a vortex
precession meter, the disciplinarian of the vortex precession
and the mechanism of hydrodynamic oscillation inside the vortex
precession meter are numerically investigated by using the large
eddy simulation. The results show that the periodical eccentric
motion of the vortexes initiates a hydrodynamic oscillation
inside the vortex precession meter. The visualized time
dependent flow fields indicate that the pressures at axisymmetric points oscillate with a same intensity and
frequency but 180°phase shift. By using differential sensing
technique, a new prototype of double-double-sensor vortex
precession meter, aimed to improve measurement accuracy, is
developed.
Key words: Flow
measurement Vortex precession Hydrodynamic oscillation Flow
visualization
*
This project
is supported by National Natural Science Foundation of China (59835160).
Manuscript received on January 12, 2000; revised manuscript March 20, 2000
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