1998 Volume 41 Issue 4 Pages 863-870
This paper presents a correlative mapping method for measuring individual phase flow rates in an air-water two-phase flow. The method consists of the extraction of stochastic features from differential pressure waveforms, construction of a data base by making contour maps of the feature vectors, and flow rate identification based on a pattern recognition technique using the data base and measured pressure waveforms. To enable the metering device to be portable, pressure is detected by a Venturi tube installed just downstream of an offset elbow, by which the mixture is forcibly mixed, and which brings about a definite flow state depending on a pair of phase flow rates. Experiments in an air-water loop showed that individual phase flow rates can be measured with an accuracy of 4.7% for the air phase and 4.0% for the water phase, and that the method appears to be applicable for measuring production rates at well heads in offshore oil fields.