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Overview of the standard device for two-phase fluid electromagnetic flowmeter

The flow process of two-phase flow (or multi-phase flow) is very complicated, and the parameters required for electromagnetic flowmeter measurement are numerous. Many parameters of the splash gauge or the most accurate measurement method are still developing continuously, and there is no definite verification method and Precise test device. For example, there are many methods for measuring the true volume content of gas phase in gas-liquid two-phase flow, but there is still no suitable standard device. The accuracy of a certain measurement method or measuring instrument can only be compared with another one. The measurement results of the measurement methods are compared by a method to indicate. Therefore, it is difficult to write a verification method and a standard device for measuring two-phase flow parameters.

Foreign countries have made promising progress in the use of relevant flow measurement technology, the mechanism of measuring two-phase fluids and the design of sensors, as well as the development of online real-time correlators.

Looking for a country-related flow Although the research work on measurement technology began in the late 1970s, in general, there are still many gaps from industrial field applications.

Basically, the relevant flow measurement system can be used to measure the flow velocity of two-phase fluids such as gas/liquid, liquid/solid and gas/solid, and can also be used to measure the flow velocity of a single-phase fluid. The electromagnetic flowmeter is characterized by a non-contact method to form a flow rate measurement system for a two-phase fluid. Under certain flow conditions, information about the concentration of the fluid mixture is obtained according to the power of the flow noise signal, and is matched with the relevant flow information. , constitutes a mass flow side measurement system. Therefore, the related flowmeter technology has developed into a powerful tool for solving two-phase flow measurement.

Since the two-phase fluid flow condition (especially the gas/liquid two-phase flow state) is very complicated, the working principle, structure and geometry of the sensor for detecting the flow noise signal are different, and the measurement technology of the submersible electromagnetic flowmeter itself is different. The statistical characteristics, the interpretation of the physical meaning of the relevant velocity, and the determination of the accuracy of the flow rate measurement of the relevant flow measurement system, it is impossible to draw conclusions by theoretical analysis alone, but must establish a two-phase flow standard with sufficient accuracy test means. On the mounting, the flow rate and measurement accuracy of the relevant flow suction side system are separately calibrated, and the meaning of the relevant speed is correctly explained in combination with the theoretical model. In addition, in order to analyze the dynamic characteristics of various flow noise sensors, the development of a new type of flow noise sensor system also requires the establishment of a two-phase fluid standard ugly. From the experimental point of view, the influence of the flow characteristics of the two-phase flow on the flow noise signal is studied to test the correctness of the theoretical model. In the third aspect, from the point of view of the measurement of the submersible electromagnetic flowmeter, the two-phase flow test technology is constantly developing, and the scientific research results are springing up. The measurement performance is also imminent. If the standard device is established, it will be dragged down and the bottom of the scientific research.

Therefore, establish a variety of two-phase flow standard devices, carry out research on two-phase fluid quantity and testing technology, develop and improve new two-phase fluid parameters and flow patterns for the development and improvement of relevant flow location systems. It is imperative.

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