Gas-liquid slug flow structural flow velocity acoustic-electric dual-mode measurement method
A measurement method, dual-modal technology, applied in fluid velocity measurement, average velocity measurement, velocity/acceleration/impact measurement, etc., can solve the problems of complex holdup distribution, fluid holdup and flow velocity fluctuation, etc. The effect of low cost and convenient measurement
Active Publication Date: 2017-11-24
TIANJIN UNIV
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Problems solved by technology
However, in the actual flow process, there are complex holdup distributions and flow velocity profiles in the fluid, especially the gas and liquid bombs that appear intermittently in the slug flow, resulting in drastic fluctuations in the holdup and flow velocity of the fluid over time.
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[0028] Embodiments of the present invention will be described in detail below in conjunction with the drawings.
[0029] figure 1 It is a structural schematic diagram of a continuous wave ultrasonic Doppler sensor in the measurement method of the present invention. The ultrasonic Doppler probe used in the patent of the present invention adopts a dual-crystal ultrasonic transducer with integrated transceiver, which contains a transmitting piezoelectric ceramic chip 3a and a receiving piezoelectric ceramic chip 3b, which are respectively attached to the acoustic-electric coupling materials 3c and 3d . The acoustic-electric coupling material is in direct contact with the fluid, and forms an angle θ with the horizontal pipe 1 0 It is installed so that the ultrasonic beam path maintains an angle θ with the incoming flow direction 0 of the two-phase flow 2 . A sound-insulating material 4 is added between the acoustic-electric coupling materials 3c and 3d to prevent interference b...
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The present invention relates to a gas-liquid slug flow structural flow velocity acoustic-electric dual-mode measurement method. The method is realized by adopting a bicrystal ultrasonic transducer and an electric sensor, and comprises the steps of acquiring the moisture content of the electric sensor and a Doppler frequency shift signal of an ultrasonic sensor; calculating a moisture content mean value thH within the sampling time, taking the moisture content mean value thH as a moisture content threshold value to divide the areas of the flow, utilizing the moisture content sequences of a liquid slug area and a gas slug area to calculate the moisture content mean value of the liquid slug area and the moisture content mean value of the gas slug area separately, and carrying out the secondary area division on the flow to divide into the gas slug area, a mixed area and the liquid slug area; utilizing the empirical mode decomposition to carry out the high-frequency denoising processing on the ultrasonic Doppler frequency shift signal; utilizing the empirical mode decomposition again to decompose into a plurality of intrinsic mode functions; calculating the Doppler average frequency shift within the time range of the liquid slug head, namely the mixed area, the Doppler average frequency shift within the time range of the liquid slug area and the Doppler average frequency shift within the time range of a liquid film; calculating the structural flow velocity of the slug flow.
Description
technical field [0001] The invention belongs to the technical field of fluid measurement, and relates to a combined measurement method of an ultrasonic sensor and an electrical sensor. By decomposing Doppler test signals, the undisturbed acquisition of the structural flow velocity of gas-liquid slug flow is realized. Background technique [0002] Gas-liquid two-phase flow widely exists in industrial production processes such as petroleum, nuclear power units, and chemical industry. Compared with single-phase flow, its flow process presents complex randomness, especially when the flow rate is high, it is easy to form an intermittent flow pattern. When the interaction between the gas-liquid two phases is more obvious, the severe pressure fluctuation will cause a strong impact on the pipeline, and even cause a safety accident in severe cases. Therefore, the measurement of the flow velocity of gas-liquid slug flow structure is of great significance for model establishment, predi...
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Login to View More IPC IPC(8): G01P5/24G01P11/00G01N27/00
Inventor 谭超史雪薇董峰
Owner TIANJIN UNIV