【作者】 王淳；

【导师】 金宁德；

【作者基本信息】 天津大学 ， 检测技术与自动化装置， 2008， 硕士

【摘要】 垂直和倾斜上升管中油水两相流流动结构及其相态逆转特性对流量检测影响很大。本文设计了阵列电导探针测量系统,并将该系统与纵向多级阵列电导传感器(VMEA)组合后,提出了研究油水两相流流动结构的一种新方法。经过阵列电导探针信号及VMEA信号综合处理分析后,取得了如下研究结论:1.对于垂直上升管中油水两相流不同流型,阵列电导探针输出信号波形具有明显不同的特点,根据波形曲线形态特征,可以实现对水包油流型、过渡流型和油包水流型的有效识别。采用递归分析方法处理VMEA传感器电导波动信号结果表明,具有平均测量特性的VMEA电导波动信号可以实现对上述三种流型的有效识别,并且阵列探针信号与VMEA电导信号识别流型结果具有较好的一致性。2.在阵列电导探针波形分析和VMEA传感器电导波动信号分析基础上,确定了所测量流动工况范围内的流型转换图,并与国内外发表的4种垂直上升管中油水两相流流型边界模型进行了对比,结果表明:运动波理论模型对由过渡流型向油包水流型转化的较高水流量区比较准确,而基于实验观察模型对由过渡流型向油包水流型转化的较低水流量区比较准确。3.对于倾斜上升管中油水两相流不同流型,采用阵列电导探针信号与VMEA电导传感器信号组合方式,可以对四种典型流型进行有效识别(D O/W PS、D O/W CT、TF和D W/O流型)。VMEA传感器直流电导信号在宏观上指示四种不同流型的结构特点,而阵列电导探针信号则能够识别每种流型在管道不同位置处的两相流体流动结构。此外,还得到了倾斜油水两相流相干系数与流动特性之间的变化关系。更多还原

【Abstract】 The flow structure and the phase inversion have great influence on the flow measurement in vertical and inclined upward oil-water two-phase flow. This paper describes the design of the mini- conductance array probes measurement system. With the combination mini-conductance array probes and VMEA measurement system, a new method is proposed for the research of the flow structure of oil-water two-phase flow. By the integrated analysis of the signals of mini-conductance array probes and VMEA sensor, following conclusions have been achieved:1. Different flow patterns result in very different output waveforms of the mini- conductance array probes in vertical upward oil-water two-phase flow. According to the characterization of the waveform, three kinds of flow pattern, which are oil-in-water flow, transitional flow and water-in-oil flow, were classified efficiently. The conductance fluctuating signals of VMEA sensor were processed by recurrence analysis method and the results indicate that the conductance fluctuating signals of VMEA sensor could also identify the three flow patterns, which is consistent with mini- conductance array probes results.2. Based on the analysis of the waveform of the mini-conductance array probes and the conductance fluctuating signals of VMEA sensor, we get the vertical upward oil-water two-phase flow pattern map in the range of this flow condition. Compared with other four published vertical upward oil-water two-phase flow pattern transition boundary models, it is founded that the oil-water two-phase flow model based on kinematic wave theory is good for the transition from transitional flow to water-in-oil flow pattern in the range of higher water superficial velocity, and the former model based on experimental observation is good for the transition from transitional flow to water-in-oil flow pattern in the range of low water superficial velocity.3. With the combination of mini-conductance array probes and VMEA sensor, four typical flow patterns (D O/W PS, D O/W CT, TF and D W/O) are identified efficiently in inclined upward oil-water two-phase flow. It is pointed out that the DC conductance signals of VMEA sensor can indicate the flow structures of four different flow patterns in macroscopic point of view and the output signal waveforms of mini-conductance array probes can identify the different flow pattern structures of different position of the pipe. In addition, we get the relationship between correlation coefficient of the oil-water two-phase flow and flow characteristics.更多还原