【作者】 许威威；

【导师】 冀海峰；

【作者基本信息】 浙江大学 ， 控制科学与工程， 2015， 硕士

【摘要】 两相流在工业过程中广泛存在,随着小型化设备的发展,对微/小型尺度下的两相流体系进行研究是目前两相流参数检测领域的热点研究内容之一。然而目前小管道气液两相流参数检测方法通常是借鉴常规管道下的测量方法,寻求适用于小管道气液两相流的参数检测手段是两相流参数检测研究中的重要内容。流量作为气液两相流的重要参数之一,一直受到广大科研工作者青睐,但是应用于小管道气液两相流流量测量方法极为有限。本文以小管道气液两相流为研究对象,对小管道气液两相流段塞流的流量测量方法进行了研究。主要工作和创新点如下：1.基于流速-相含率流量测量方法和PVT(压力-体积-温度)的流量测量方法分别设计搭建了小管道气液两相流流量测量装置。2.提出了基于流速-相含率的小管道气液两相流段塞流流量测量方法。该方法利用上下游光电池传感器获取小管道气液两相流段塞流的相关流速,利用高速摄像机获取小管道段塞流的相含率。根据所获得的流速和相含率建立了小管道气液两相流段塞流流量测量模型,实现了小管道气液两相流流量的测量。在内径为4.0mm和5.0mm的水平小管道进行了实验研究。实验结果表明：该方法是可行的,测量的最大相对误差小于10%。3.提出了一种基于PVT法的小管道气液两相流段塞流流量测量方法。该方法在实验测量管段上下游设置了两个检测点,分别利用光电池传感器测量上下游检测点的相关流速,同时测量上下游检测点的温度和压力。根据PVT法建立了小管道气液两相流段塞流流量测量模型,在内径为4.0mm和5.0mm的水平小管道进行了实验验证,实验结果表明：该方法是可行的,测量的最大相对误差小于10%。更多还原

【Abstract】 Gas-liquid two-phase flow exists widely in industrial processes. With the development of small-scale industrial equipment, parameter measurement of micro/small pipe two-phase flow becomes one of popular fields in current two-phase flow research. However, the parameter measurement methods of small-pipe two phase flow generally refer the methods which are used in conventional pipe, and so it’s important to seek for the parameter measurement methods that can be applied in small-pipe two-phase flow. As an important parameter of two-phase flow, research on flowrate is of great scientific significance and engineering application value, however, the flowrate measurement method in small-pipe two-phase flow is seldom reported. In this work, flowrate measurement methods of slug flow in small-pipe gas-liquid two-phase flow are studied. Main works and innovations are listed as follows:1. Two small-pipe gas-liquid two-phase slug flow flowrate measurement systems are established based on velocity-void fraction flowrate measurement method and PVT(pressure-volume-temperature) technique.2. Based on velocity-void fraction flowrate measurement method, a flowrate measurement method for slug flow in small-pipe gas-liquid two-phase flow is presented. In this method, correlation velocity is measured by the photodiode sensors which are placed on the upstream and downstream and void fraction is measured by high speed camera. Then flowrate measurement model is established by the calculated velocity and void fraction. The experiments are carried out in a horizontal small-pipe with inner diameter of 4.0mm and 5.0mm respectively. Experimental results indicate that the presented models are feasible for gas-liquid two-phase slug flow flowrate measurement in small-pipe, and the maximum measurement relative errors are less than 10%.3. Based on PVT technique, a flowrate measurement method for slug flow in small-pipe gas-liquid two-phase flow is proposed. In this method, two detection points are set on upstream and downstream of the experiment pipeline respectively. The correlation velocities of the two detection points are measured by the photodiode sensors, and the pressure and temperature of the two detection points are recorded concurrently. Then flowrate measurement model is established based on the PVT technique. The experiments are carried out in horizontal small-pipes with inner diameter of 4.0mm and 5.0mm. Experimental results indicate that the models established are feasible, and the maximum measurement relative errors are less than 10%.更多还原