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Two-phase flow instantaneous split-phase holdup prediction method based on phase space topology causality

A prediction method and phase space technology, applied in the direction of measuring devices, analyzing materials, and material analysis by electromagnetic means, can solve the problems of low measurement accuracy of phase holding ratio of two-phase flow, improve prediction accuracy, and overcome soft field effect Effect

Active Publication Date: 2020-05-22
TIANJIN UNIV
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Problems solved by technology

The complex flow structure of two-phase flow brings great challenges to the measurement of phase holdup
At present, electrical and acoustic sensors have been widely used in the measurement of two-phase phase holdup, but due to the soft field characteristics of the sensor detection field, the measurement accuracy of two-phase phase holdup is low

Method used

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  • Two-phase flow instantaneous split-phase holdup prediction method based on phase space topology causality
  • Two-phase flow instantaneous split-phase holdup prediction method based on phase space topology causality
  • Two-phase flow instantaneous split-phase holdup prediction method based on phase space topology causality

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Embodiment Construction

[0031] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. The present invention includes:

[0032] (1) Design a conductive grid sensor and install it on a circular pipe. The conductive grid sensor is composed of two layers of parallel metal thin wires that are perpendicular to each other and do not touch each other. Take the 8×8 measurement system as an example to illustrate the working principle of the conductivity grid sensor, such as figure 1 shown. E. 1 -E 8 Indicates the excitation electrode, R 1 -R 8 Indicates the receiving electrode. The oscillator generates a sinusoidal voltage signal, the sinusoidal voltage signal is used as an excitation signal, with V Eexpress. The single-chip microcomputer controls the closing and opening of the analog switch to realize the cyclic connection of the excitation electrode and the excitation signal, that is, cyclic excitation. At the moment when each excitati...

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Abstract

The invention relates to a two-phase flow instantaneous split-phase holdup prediction method based on phase space topology causality, and the method comprises the steps: designing a conductive grid sensor which is an 8 * 8 conductive grid sensor formed by two layers of parallel metal fine lines perpendicular to each other and making no contact with each other, and installing the conductive grid sensor on a circular pipeline; extracting each frame of data of the conductive grid sensor; constructing a one-dimensional data sequence according to normalized values of the measurement data distributed on the intersection points of the conductive grid sensors; according to a phase space embedding theory, embedding each data segment of the one-dimensional data sequence S into a phase space, and establishing mapping phi between adjacent phase spaces; training a radial basis function neural network to estimate the mapping phi, and calculating a causality index according to an estimation error; calculating a causal index between any two adjacent phase spaces; obtaining a causal index sequence R; and predicting the instantaneous water holdup of the two-phase flow by using the causal index sequence R.

Description

technical field [0001] The invention relates to a method for predicting the phase-space phase-space phase-to-phase ratio of instantaneous phase-to-phase flow based on phase-space topological causality Background technique [0002] Two-phase flow phenomena widely exist in chemical, petroleum, nuclear engineering and other fields, such as gas-liquid two-phase flow, oil-water two-phase flow, etc. The turbulent characteristics of two-phase flow are complex, and the slippage between phases is serious, which leads to the complex spatio-temporal structure and multi-scale characteristics of two-phase flow. For example, in the flow process of gas-liquid two-phase flow, unstable layered interface waves, quasi-periodic Taylor bubbles, and randomly distributed bubbles may appear. The complex flow structure of two-phase flow brings great challenges to its phase holdup measurement. At present, electrical and acoustic sensors have been widely used in the measurement of two-phase phase ho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
CPCG01N27/00
Inventor 翟路生杨杰
Owner TIANJIN UNIV
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