Abstract:

A modified formula was deduced to reduce measuring error of vortex flow meter under fog two-phase flow condition. In fog two-phase flow, injected liquid results in increase of vortex flow meter measuring error. Some research conclusions and methods about Karman vortex street phenomenon were summarized. Also dynamic characteristics of fog two-phase flow were analyzed and compared with single-phase flow. The theory of vortex street wave considers that the energy in vortex street field is transmitted in the shape of wave. According to the theory, this structure of vortex street in fog two-phase flow was investigated. Finally, a gas-liquid coupled dynamic model of two-phase flow was presented. The results showed that new correlation could predict vortex flow meter measuring satisfactorily under the conditions of liquid volume fractions from 0 to 0.13%.