Method and system for testing flow of homogeneous gas-liquid mixed two-phase flow based on ERT

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

Active Publication Date: 2019-08-09
XIDIAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The operation of the process is more complicated, the prec

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  • Method and system for testing flow of homogeneous gas-liquid mixed two-phase flow based on ERT
  • Method and system for testing flow of homogeneous gas-liquid mixed two-phase flow based on ERT
  • Method and system for testing flow of homogeneous gas-liquid mixed two-phase flow based on ERT

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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this time, the performance of the mechanical seal will change greatly, and the traditional single-phase flow theory is no longer applicable.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 provides a method and system for testing flow of a homogeneous gas-liquid mixed two-phase flow based on an ERT. The method solves the problem of measuring gas-liquid flow when the homogeneous gas-liquid mixed two-phase flow is not separated; the method includes the following implementation steps that double-layer temperature control pipes and vacuum treatment between pipes are designed; the flow rate of a gas-liquid two-phase flow is measured, voltage data are collected; a flow map of a two-phase flow is reconstructed by a RBF neural network and a gas-liquid mixed ratio is computed, and flow results of gas and liquid are output. The system includes a sensor unit with double-layer temperature control vacuum pipes, a data collection and treatment unit, an image reconstruction unit and a flow computation unit; an air jet is installed on the wall of an external pipe in the sensor unit, temperature and pressure sensors are correspondingly installed on the front and rear part of an electrode array, and the electrode array is installed around an internal pipe for one circle in an equal-interval mode. According to the method and system for testing the flow of the homogeneousgas-liquid mixed two-phase flow based on the ERT, the two-phase flow does not need to be separated, and the protection for medium is achieved; system construction is simple, measuring accuracy is high, and the real-time ability is high; and the system is used under the conditions of low temperature and high speed, and used for measuring flow and leakage volume in the field of aerospace, energy andpetrochemical industry.

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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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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