In order to investigate the structure parameters effect on wet gas performance of throttling device

a long slot internal Venturi throttling device with the fluid restricted to the periphery of the pipe which is relative to the traditional Venturi is designed

and the wet gas metering characteristic is studied based on experiment

the hydraulic diameter and the liquid dispersion effects on the over-reading are analyzed relatively.The experimental study and theoretical analysis show that the friction pressure loss due to the acceleration effect of gas to liquid is a major reason behind the over-reading

under the same flow conditions

the over-reading tends to increase with smaller hydraulic diameter of the throttling device and more homogeneous mixed gas and liquid.The result analyze the geometry structure parameters effect on wet gas performance of throttling device in detail and supply important design values for optimizing the structure of the wet gas flow meter based on the throttling devices that restrict the fluid to the periphery of the pipe.