Slotted orifice is a new type of flow measuring element for gas-liquid two-phase flow measurement

Comparing with standard orifice

slotted orifice has a lot of advantages.It has less strict requirement for straight pipes upstream and downstream

its differential pressure signals are steady and there is no accumulation of liquid phase in the upstream.By analyzing local resistance of the slotted orifice

total pressure drop mainly consisted of frictional pressure drop and acceleration pressure drop.Based on flow mechanism of gas-liquid two-phase flow passing slotted orifice

frictional pressure drop and acceleration pressure drop could be calculated by momentum conservation equations and mass conservation equations

then the differential pressure drop prediction model could be developed.A series of experiments were carried out on air-water two-phase flow.According to the experimental results

mean relative error of slotted orifice with beta ratio of 0.75

0.6

0.5 were 6.45%

11.06%

12.52%.This work provided a reference for perfecting the algorithm of wet gas metering.