Method and apparatus for determining the phase compositions of a multiphase fluid flow

摘要

There is disclosed a method of determining the phase compositions of a multiphase fluid flow in a fluid line, including determining a flow velocity parameter which is related to the flow velocity of the fluid flow in the fluid line using a flow sensor and obtaining a vibration signal from the fluid flow using a vibration sensor 22 comprising a target 38 disposed in the fluid flow which vibrates in response to fluid flow in the fluid line. The vibration signal is analysed to determine an energy parameter which is related to the energy of the vibration signal within a frequency band, and a phase composition parameter, such as a dryness parameter, relating to the phase compositions of the fluid flow is determined using the flow velocity parameter and the energy parameter. There is also disclosed an apparatus 10 for determining the phase compositions of a multiphase fluid flow in a fluid line.