Research On Multiphase Flowmeter

A research of the measurement of multiphase flow is shown in this paper. It presents a new measurement method taken with a multiphase flow meter based on ultrasonic sensor, capacitance sensor, conductance sensor, diff-pressure measurement and so on. Data fusion technology and cross-correlation measurement technology are also used in this method. Then, it describes a new method that can measure the phase fraction of the individual components of multiphase medium: oil, gas and water with the ultrasonic module.The paper deduced the relations between the phase fractions of the multiphase flow and measured signals, including the time of ultrasonic get across the multiphase, the dielectric constant, electrical conductivity and the relations between the multiphase rate and the measured signals, such as diff-pressure.The design was modularized. The modules including main module which is based on CAN bus, ultrasonic module and temperature-pressure module were developed. The kernel of the modules is ARM processor and MSC1210Y5 which has a high precision A/D converter. The module of cross-correlation which is based on digital signal processor (DSP) was designed.The prototype has the characteristics of small volume and low cost. Modularization is convenient for installation and maintenance of the components. The system accords further development of multiphase fiowmeter.