DEVICE AND METHOD FOR DETERMINING FLOW RATES IN A TWO-PHASE STREAM

摘要

A flowmeter for measuring pressure drops indicative of the flowrates of the individual phases in a gas and liquid containing two-phase stream. Means are provided for creating and measuring a frictional pressure drop in the two-phase flow. Means are also provided for creating and measuring an acceleration pressure drop in the two-phase flow. Mathematical models are known in two-phase theory for correlating these pressure drop measurements with the flowrates of the individual phases. In a preferred mode of the invention the frictional pressure drop is measured across a twisted tape (7); the accelerational pressure drop is measured accross a venturi (3) downstream of the twisted tape, and the pressure drops are measured by pressure transducer means (4, 5). The meter also preferably provides means for measuring the static pressure of the two-phase flow.