基于電導(dǎo)法水平管環(huán)狀流液膜厚度測量系統(tǒng)設(shè)計(jì)
[Abstract]:Horizontal pipe gas-liquid two-phase annular flow is one of the most important and common flow patterns in engineering. It is widely used in the fields of petroleum, chemical industry, pipeline transportation, nuclear reactor and so on. In the gas-liquid two-phase annular flow in a horizontal pipe, due to the high velocity of the gas flow, the interface of the liquid film fluctuates. With the evolution of the fluctuation, the liquid film is continuously absorbed into the gas core in the form of droplets, and the liquid droplets are splashed back into the liquid film. As a result of secondary entrainment, the structure and dynamic characteristics of horizontal tubular annular liquid membrane show strong randomness, rapidity and complexity. Therefore, it is very important to construct an accurate and reliable measurement system of liquid membrane parameters for horizontal tube annular flow film. The thickness of liquid film is an important parameter of liquid film, and it is very important to measure the thickness of liquid film. The main content of this paper is the research of liquid film thickness measurement system based on conductance method for horizontal tube annular flow. The main work is as follows: 1. Based on the single zone average liquid film thickness prediction model, the influence of entrainment droplets on the change of gas core density was introduced, and the average liquid film thickness of horizontal annular flow was predicted under laboratory conditions. Based on the theoretical model of predicting the thickness distribution of circumferential liquid film in annular flow of horizontal tube, the relationship between the average thickness of liquid film and the thickness of bottom liquid film is obtained, and the thickness of liquid film at bottom of gas-liquid two-phase annular flow in horizontal tube is estimated. The experimental measurement method of liquid film thickness was summarized and the electrical method was studied. The sensor is designed by the conductance method and the coaxial ring sensor is designed. The sensor structure. 3. 3 is determined by optimizing the size and electrode size of the sensor by COMSOL software simulation. A measuring system of liquid film thickness based on conductance method is designed and constructed. The measuring system includes three parts of coaxial ring sensor, a conductance measurement system based on FPGA and a static experimental measuring device. The static experiment of measuring the thickness of liquid film was carried out and the experimental results were analyzed.
【學(xué)位授予單位】:天津大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:TH71
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