Multiphase flow phenomena are widespread in nature and production process. The study of the flow mechanism and characteristics are a very important in the multiphase pipe flow. The establishment of multiphase flow exp...
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Multiphase flow phenomena are widespread in nature and production process. The study of the flow mechanism and characteristics are a very important in the multiphase pipe flow. The establishment of multiphase flow experimental devices and systems is necessary in the study. In order to multi-phase pipe flow simulation, the small-scale physical experimental system based on the PLC control, and the experimental simulation system of based on Configuration software design are achieved. The physical experimental system can be achieved signals acquisition and control. Bubble flow, stratified flow, wavy flow, slug flow and other flow patterns can be formed in the experimental pipeline by changing the oil-gas-water flow rate. The virtual experimental system consists of the control interface and virtual physical interface. The simulation experiments of the multiphase flow generation can be achieved through the data exchange by two computers. This system meets the requirements for multiphase flow experiment.
Bubble flow video imaging device uses two high speed cameras to capture the bubble rising process in a transparent still sink. Tsai's two step calibration method, Zhang Zhengyou calibration method, Camera Calibrat...
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Bubble flow video imaging device uses two high speed cameras to capture the bubble rising process in a transparent still sink. Tsai's two step calibration method, Zhang Zhengyou calibration method, Camera Calibration Toolbox for Matlab are selected to do the calibration experiments on the high speed cameras. Each calibration method gives a different calibrated model. The accuracy of different model is compared. It's proved that Zhang's calibration method gives the most accurate model in this experiment. The fundamental of different calibration methods are given at the beginning. The calibrated model given by Zhang's method is used to revise bubble parameters extracted from bubble flow images.
A water flow diverter is an essential and error determining component of a liquid flow facility based on a static gravimetric system with flying start and finish. A new diverter was developed in order to reduce the un...
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Electromagnetic tomography (EMT) is of potentially practical value in the field of both industrial and biomedical detection. However, the sensitivity of the sensor array on the changes of the object field distribution...
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Electromagnetic tomography (EMT) is of potentially practical value in the field of both industrial and biomedical detection. However, the sensitivity of the sensor array on the changes of the object field distribution, sensitivity and accuracy of the system, measurement precision and system stability are highly dependent on excitation condition. In this paper, the excitation condition of EMT is analyzed with COMSOL Multiphysics the finite element analysis software, the effect can be discussed in two aspects. One is the direct effect on the measurement results from the change of the excitation condition; another is the changing affect on the distribution of integrated sensing field. In this paper, two elements were set which would lead to the change of the excitation condition, the excitation frequency and the excitation strategy. These two elements would affect the sensing field from diverse aspects.
Differential pressure (DP) flow meters are playing an increasingly important role in multiphase flow in petroleum industry. The long waist cone flow meter, as a new type of DP flow meter, is introduced in this paper. ...
Differential pressure (DP) flow meters are playing an increasingly important role in multiphase flow in petroleum industry. The long waist cone flow meter, as a new type of DP flow meter, is introduced in this paper. And its flow field in a horizontal pipe of 50mm diameter is numerically simulated with Computational Fluid Dynamics (CFD), in search of the optimum pressure-tapping method. The results of numerical simulations indicate that the long waist cone flow meter has the merits of the annular channel flow meters by forming an annular flow in annular channel region, which makes it possible to improve the repeatability and accuracy of measurement. The high pressure port at the 1D upstream of the cone's entrance section and the low pressure port at the middle of annular channel region and 3D downstream of the cone's exit section are the optimum pressure-tapping methods. The relative error of discharge coefficient is within ±0.5%. This investigation will provide a theoretical and design basis for the development of new DP flow meters.
Conductance sensor array is widely used in measuring two-phase flow parameters, in this paper we propose a new configuration of conductance sensors with six rectangular electrodes of same size from the pipe facing to ...
Conductance sensor array is widely used in measuring two-phase flow parameters, in this paper we propose a new configuration of conductance sensors with six rectangular electrodes of same size from the pipe facing to an inner ring-type electrode and use it to measure gas cross-sectional-averaged water holdup value. The designed six rectangular electrodes are axially flush-mounted on the inside wall of an insulating duct. The geometry of six electrodes conductance sensor was determined with finite element numerical analysis. Sensor optimization of the electric field such as uniformity, spatial sensitivity is proposed. This configuration can improve measurement accuracy, through analyze sensitivity distribution, the role of soft field is discussed, and acquired the final size of the electrodes in the end. The simulation results were obtained from COMSOL Multiphysics finite element software.
This paper mainly studies the design and optimization of diverter's nozzle in the flow facility. The profile of the flow at the outlet of the nozzle has great influence to the performance of the diverter. In case ...
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This paper is concerned with minimum error entropy filter design for non-linear Networked control Systems (NCSs) with multiple-packet transmission mechanism. Since the error of the filter in NCSs is generally non-Gaus...
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It presents a computer control system for processcontrol based on data-driven. The system focuses on process data and is able to deal with the complex problems such as nonlinearity, significant delay, strong coupling...
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ISBN:
(纸本)9781467323635
It presents a computer control system for processcontrol based on data-driven. The system focuses on process data and is able to deal with the complex problems such as nonlinearity, significant delay, strong coupling and stochastic uncertainty, which are ubiquitous in processcontrol. It adopts both modeling method based on data and learning control theory. The computer control system is composed of PC servers and high performance embedded special controllers. control network adopts fully-distributed automation islands based on industrial Ethernet. So the powerful ability of data process is provided for the system and can satisfy the requirement of modeling and controlling based on data-driven.
This paper introduces a method of forming up the cross sectional velocity profile of horizontal two-phase flow by adopting a dual-plane Electrical Resistance Tomography (ERT) system and cross correlation method. The p...
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This paper introduces a method of forming up the cross sectional velocity profile of horizontal two-phase flow by adopting a dual-plane Electrical Resistance Tomography (ERT) system and cross correlation method. The preliminary results are presented with numerical simulations, where a pixel-like mesh is used to segment the cross section of the measuring field. The relationship between the peripheral voltages measured from the electrodes with a feature value within a specific pixel is determined. The numerical simulation results show that this method can provide a visual distribution of velocity profile of dispersed phase within a continuous phase in the cross section of the pipeline.
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