Wet-Gas Flow Modeling for the Straight Section of Throat-Extended Venturi Meter

In this paper, the wet-gas flow modeling for the straight section of a throat-extended Venturi meter was studied. Based on the separated-flow theory, a flow model was presented. The relationship between the fluctuating properties of the differential pressure (DP) over the straight section and the quality of the wet-gas flow was also studied, and a flow model of the fluctuation of the DP for wet-gas metering was established. Experiments were carried out within a system pressure range of 0.26-0.86 MPa, a gas volumetric flowrate range of 80-120 m³/h, a water volumetric flowrate range of 1.3-4.5 m³/h, and a quality range of 0.07-0.36. It was obtained that the root mean square of the relative errors of the DP over the straight section calculated from the separated-flow-theory-based model was 8.82% and that of the quality calculated from the fluctuating-property-related model was 8.77%.