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Method and system for measuring flow rate of homogeneous gas-liquid mixed two-phase flow based on ert

A gas-liquid mixing and flow measurement technology, applied in the direction of volume/mass flow, liquid/fluid solid measurement, measurement flow/mass flow, etc. generated by electromagnetic effects, can solve the problems of poor real-time performance, complicated operation and low precision, and achieve The effect of good real-time performance, high measurement accuracy and simple device structure

Active Publication Date: 2021-07-27
XIDIAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The operation of the process is more complicated, the precision is lower, and the real-time performance is also poor.

Method used

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  • Method and system for measuring flow rate of homogeneous gas-liquid mixed two-phase flow based on ert
  • Method and system for measuring flow rate of homogeneous gas-liquid mixed two-phase flow based on ert
  • Method and system for measuring flow rate of homogeneous gas-liquid mixed two-phase flow based on ert

Examples

Experimental program
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Effect test

Embodiment 1

[0028] For example, the mechanical seal of a rocket engine, when working in a low-temperature and high-speed environment, the friction will cause two-phase flow in the fluid medium. At this time, the performance of the mechanical seal will change greatly, and the traditional single-phase flow theory is no longer applicable. However, The traditional two-phase flow test technology is cumbersome, the measurement process is troublesome, the result accuracy is low, and the real-time performance is poor. The present invention proposes a homogeneous gas-liquid mixed two-phase flow flow test based on ERT after innovation and research. methods and systems.

[0029] The invention is an ERT-based flow test method for homogeneous gas-liquid mixed two-phase flow, which defines the liquid phase as a continuous phase and the gas phase as a discrete phase. In the working place where homogeneous gas-liquid mixed two-phase fluid is usually provided with an inlet pipe, a central pipe and an outl...

Embodiment 2

[0037] The homogeneous gas-liquid mixed two-phase flow flow testing method based on ERT is the same as embodiment 1, the RBF (radial basis) neural network described in the step (4) of the present invention, its network structure is a three-layer forward network: input layer, hidden layer and output layer. Among them, there is a nonlinear relationship between the input layer and the hidden layer, and a Gaussian function is used to transform from the input layer to the hidden layer, and the data is mapped to a high-dimensional space, and there is a linear relationship between the hidden layer and the output layer. The input is multiple sets of voltage data reflecting the gas-liquid mixed two-phase flow pattern measured by the electrode array. After the voltage data preprocessing, training, verification, testing, and image filling steps, the output is the reconstructed two-phase flow pattern image. . The present invention uses RBF (radial basis) neural network to reconstruct the...

Embodiment 3

[0039] The ERT-based homogeneous gas-liquid mixed two-phase flow flow test method is the same as that of Embodiment 1-2, and the flow calculation described in step (5) of the present invention is specifically the flow calculation method of the homogeneous gas-liquid mixed two-phase flow:

[0040] (5.1) Calculation of continuous phase (liquid phase) flow q 1 =s·(1-α)·v; where s is the area of ​​the sensitive field (cross-sectional area of ​​the inner pipe), and α is the mixing ratio, that is, the ratio of the discrete phase (gas phase) to the area of ​​the sensitive field (cross-sectional area of ​​the inner pipe), v is the velocity of homogeneous gas-liquid mixed two-phase flow.

[0041] (5.2) Calculate the discrete phase (gas phase) flow rate q 2 =s·α·v; where s is the area of ​​the sensitive field (cross-sectional area of ​​the inner pipe), α is the mixing ratio, that is, the ratio of the discrete phase (gas phase) to the area of ​​the sensitive field (cross-sectional area ...

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Abstract

The invention proposes a homogeneous gas-liquid mixed two-phase flow flow test method and system based on the ERT principle; it solves the problem of gas-liquid flow measurement when the homogeneous gas-liquid mixed two-phase flow is not separated. Implementation steps: design double-layer temperature-controlled pipelines and vacuum treatment between pipelines; measure gas-liquid two-phase flow velocity; voltage data acquisition; RBF neural network reconstruction of two-phase flow flow patterns and calculation of gas-liquid mixing ratio; output gas-liquid flow results . The system includes a sensor unit with a double-layer temperature-controlled vacuum pipeline, a data acquisition and processing unit, an image reconstruction unit, and a flow calculation unit; the gas nozzle in the sensor unit is installed on the outer pipeline wall, and the temperature / pressure sensors are respectively installed before and after the electrode array. , the electrode arrays are installed equidistantly around the inner pipeline. The invention does not need to separate the two-phase flow and realizes the protection of the medium. The system has simple structure, high measurement accuracy and good real-time performance. It is used to measure flow and leakage in aerospace, energy, petrochemical, etc. at low temperature and high speed.

Description

technical field [0001] The invention belongs to the technical field of two-phase flow testing, in particular to flow measurement of homogeneous gas-liquid mixed two-phase flow. Specifically, it is an ERT-based homogeneous gas-liquid mixed two-phase flow flow test method and system, which is mainly used in aerospace, petrochemical, energy and power industries. Background technique [0002] The medium in nature can be divided into three different phases: solid phase, liquid phase, and gas phase. The flow of one-way media is called single-phase flow, and two-phase flow or multiphase flow refers to the flow of media in which two or more different phases exist at the same time. Homogeneous gas-liquid mixed two-phase flow refers to the situation where the same medium exists in both gas and liquid phases. [0003] The phenomenon of homogeneous gas-liquid mixed two-phase flow widely exists in the fields of aerospace, petrochemical, energy and power; for example, in harsh working c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F1/74G01F1/56
CPCG01F1/56G01F1/74
Inventor 张国渊党佳琦赵洋洋杨佳帅
Owner XIDIAN UNIV
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