Abstract:
Vortex street flowmeter has been used in steady flow measurement
for about three decades. The benefits of this type of flowmeter
include high accuracy, good linearty, wide measuring range, and
excellent reliability. However ,in unsteady flow measurement, the
pressure disturbance as well as the noise from the system or
surrounding can reduce the signal-to-noise ratio of the
flowmeter seriously. Aimed to use vortex street flowmeters in
unsteady flow measurement, the characteristics of the vortex
shedding induced hydrodynamic vibration around the prism bluff
body in a vortex street flowmeter are investigated numerically
and by experiments. The results show that the hydrodynamic
vibrations with 180 phase shift occur at the axisymmetric points
of the channel around the bluff body. The most intense vibration
occurs at the points on the lateral faces close to the base of
the prism. The results provide therefore a useful reference for
developing an anti-interference vortex flowmeter using the
differential sensing technique.
Key words:
Vortex street flowmeter Vortex
shedding induced hydrodynamic vibration Unsteady flow
measurement Anti-interference performance
*
This project
is supported by National Natural Science Foundation of China (No.59835160).
Manuscript received on December 12, 2000; revised manuscript April
25, 2001
|