| 摘要 |
A method and apparatus for determining gas and liquid flow rates in a multi-phase flow are provided. In accordance with one embodiment of the present invention, a method of determining gas and liquid flow rates in a multi-phase flow is provided. The method utilizes a set of gas phase ultrasonic transducers and a set of liquid phase ultrasonic transducers positioned to direct ultrasonic signals through the multi-phase flow. The method comprising the steps of: (i) establishing a set of gas phase control parameters and a gas phase algorithm for determining a flow rate of a gaseous portion of the multi-phase flow, wherein the gas phase control parameters define a gas phase ultrasonic signal characterized by a gas phase center frequency and a gas phase bandwidth and the gas phase algorithm comprises at least one of a gas phase transit time algorithm and a gas phase cross correlation algorithm; (ii) establishing a set of liquid phase control parameters and a liquid phase algorithm for determining a flow rate of a liquid portion of the multi-phase flow, wherein the liquid phase control parameters define a liquid phase ultrasonic signal characterized by a liquid phase center frequency and a liquid phase bandwidth and the liquid phase algorithm comprises a liquid phase cross correlation algorithm; (iii) controlling the gas phase ultrasonic transducers according to the gas phase control parameters so as to transmit the gas phase ultrasonic signal; (iv) analyzing the gas phase ultrasonic signal according to the gas phase algorithm; (v) controlling the liquid phase ultrasonic transducers according to the liquid phase control parameters so as to transmit a liquid phase ultrasonic signal; (vi) analyzing the liquid phase ultrasonic signal according to the liquid phase algorithm; and (vii) determining the gas and liquid flow rates based upon the analyses of the gas phase ultrasonic signal and the liquid phase ultrasonic signal.
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