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根据超声波在不同介质界面处的反射回波强弱不同的特性,提出了应用超声波对水平管气液两相流流型进行非介入式在线识别的方法。理论计算得到钢管内壁接触的介质分别为水和空气时的声压反射率,证明了超声波流型识别法的可行性。数值仿真研究管内的流体分别为水、空气时不同界面的反射回波特点,得到了超声波流型识别法的实现方式。依据数值仿真结果,开展超声波气液两相流流型在线识别实验,分析气液两种流体在管道横截面上的分布,从而识别水平管气液两相流流型。研究结果表明:在不影响生产的前提下,超声波流型识别方法能够准确获取水平管气液两相流流动过程中的实时流型,操作方法简便,且结果可靠。(图10,表1,参9)
According to the different characteristics of reflected echo at different media interface, the method of non-intrusive on-line identification of gas-liquid two-phase flow in horizontal pipe by ultrasonic wave is proposed. The theoretical calculation results show that the media contact with the inner wall of the steel tube is water and air pressure respectively, which proves the feasibility of ultrasonic flow pattern recognition. Numerical simulation is used to study the characteristics of the reflected echoes at different interfaces when the fluid in the tube is water or air respectively. The realization method of the ultrasonic flow pattern recognition is obtained. According to the numerical simulation results, the on-line identification experiment of ultrasonic gas-liquid two-phase flow pattern was carried out to analyze the distribution of gas and liquid in the cross-section of the pipeline, and the flow pattern of gas-liquid two-phase flow in horizontal pipe was identified. The results show that the ultrasonic flow pattern recognition method can accurately obtain the real-time flow pattern of gas-liquid two-phase flow in horizontal pipe without affecting the production. The operation method is simple and the result is reliable. (Figure 10, Table 1, reference 9)