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A Prediction Method of Instantaneous Phase-by-Stage Ratio of Two-Phase Flow Based on Phase Space Topological Causality

A prediction method and phase space technology, which can be used in measurement devices, material analysis, material analysis by electromagnetic means, etc., can solve the problems of low measurement accuracy of two-phase flow split phase hold ratio, improve prediction accuracy and overcome soft field effects. Effect

Active Publication Date: 2022-03-08
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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  • A Prediction Method of Instantaneous Phase-by-Stage Ratio of Two-Phase Flow Based on Phase Space Topological Causality
  • A Prediction Method of Instantaneous Phase-by-Stage Ratio of Two-Phase Flow Based on Phase Space Topological Causality
  • A Prediction Method of Instantaneous Phase-by-Stage Ratio of Two-Phase Flow Based on Phase Space Topological 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 the 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 excitat...

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Abstract

The invention relates to a method for predicting phase-space phase-space topological causality based on phase-space topological causality, comprising: designing a conductive grid sensor and installing it on a circular pipeline. The conductive grid sensor consists of two Parallel thin metal wires that are perpendicular to each other without touching each other form an 8×8 conductance grid sensor; extract each frame data of the conductance grid sensor; normalize according to the measurement data distributed at the intersection of the conductance grid sensor Value, construct a one-dimensional data sequence; according to the phase space embedding theory, each data segment of the one-dimensional data sequence S is embedded in the phase space, and a mapping Φ is established between adjacent phase spaces; training radial basis neural network Estimate the mapping Φ, and calculate the causal index according to the estimation error; a causal index can be calculated between any adjacent phase spaces; obtain a causal index sequence R; use the causal index sequence R to predict the instantaneous water holdup of two-phase flow.

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 Patents(China)
IPC IPC(8): G01N27/00
CPCG01N27/00
Inventor 翟路生杨杰
Owner TIANJIN UNIV
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