| 摘要 |
<p>A flow meter apparatus and method are presented for measuring a flow rate of a multiphase fluid mixture comprising at least one gas phase and one liquid phase. The flow meter comprises a pipe section and measurement section through which the mixture flows. The flow meter also comprises a fraction measurement device adapted to estimate a representative fraction of the gas phase and/or liquid phase of the mixture passing at the measurement section. Moreover, the flow meter preferably comprises at least one ultrasonic sensor arranged to estimate a characteristic, such as liquid film thickness or velocity, of a portion of the liquid phase flowing as liquid film along a wall of the pipe section. The characteristic is preferably used to correct the estimated representative fraction of the gas phase and/or liquid phase when the gas phase flows in a core of the pipe section, and a portion of the liquid phase flows partially as liquid film along the wall of the pipe section and another portion of the liquid phase flows partially as liquid droplets in the core of the pipe section.</p> |
